1055 lines
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1055 lines
43 KiB
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npm command-line interface
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</div>
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<section id="content">
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<header class="title">
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<h1 id="packagejson">package.json</h1>
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<span class="description">Specifics of npm's package.json handling</span>
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</header>
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<section id="table_of_contents">
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<h2 id="table-of-contents">Table of contents</h2>
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<div id="_table_of_contents"><ul><li><a href="#description">Description</a></li><li><a href="#name">name</a></li><li><a href="#version">version</a></li><li><a href="#description2">description</a></li><li><a href="#keywords">keywords</a></li><li><a href="#homepage">homepage</a></li><li><a href="#bugs">bugs</a></li><li><a href="#license">license</a></li><li><a href="#people-fields-author-contributors">people fields: author, contributors</a></li><li><a href="#funding">funding</a></li><li><a href="#files">files</a></li><li><a href="#main">main</a></li><li><a href="#browser">browser</a></li><li><a href="#bin">bin</a></li><li><a href="#man">man</a></li><li><a href="#directories">directories</a></li><ul><li><a href="#directoriesbin">directories.bin</a></li><li><a href="#directoriesman">directories.man</a></li></ul><li><a href="#repository">repository</a></li><li><a href="#scripts">scripts</a></li><li><a href="#config">config</a></li><li><a href="#dependencies">dependencies</a></li><ul><li><a href="#urls-as-dependencies">URLs as Dependencies</a></li><li><a href="#git-urls-as-dependencies">Git URLs as Dependencies</a></li><li><a href="#github-urls">GitHub URLs</a></li><li><a href="#local-paths">Local Paths</a></li></ul><li><a href="#devdependencies">devDependencies</a></li><li><a href="#peerdependencies">peerDependencies</a></li><li><a href="#peerdependenciesmeta">peerDependenciesMeta</a></li><li><a href="#bundledependencies">bundleDependencies</a></li><li><a href="#optionaldependencies">optionalDependencies</a></li><li><a href="#overrides">overrides</a></li><li><a href="#engines">engines</a></li><li><a href="#os">os</a></li><li><a href="#cpu">cpu</a></li><li><a href="#private">private</a></li><li><a href="#publishconfig">publishConfig</a></li><li><a href="#workspaces">workspaces</a></li><li><a href="#default-values">DEFAULT VALUES</a></li><li><a href="#see-also">SEE ALSO</a></li></ul></div>
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</section>
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<div id="_content"><h3 id="description">Description</h3>
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<p>This document is all you need to know about what's required in your
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package.json file. It must be actual JSON, not just a JavaScript object
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literal.</p>
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<p>A lot of the behavior described in this document is affected by the config
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settings described in <a href="../using-npm/config.html"><code>config</code></a>.</p>
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<h3 id="name">name</h3>
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<p>If you plan to publish your package, the <em>most</em> important things in your
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package.json are the name and version fields as they will be required. The
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name and version together form an identifier that is assumed to be
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completely unique. Changes to the package should come along with changes
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to the version. If you don't plan to publish your package, the name and
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version fields are optional.</p>
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<p>The name is what your thing is called.</p>
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<p>Some rules:</p>
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<ul>
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<li>The name must be less than or equal to 214 characters. This includes the
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scope for scoped packages.</li>
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<li>The names of scoped packages can begin with a dot or an underscore. This
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is not permitted without a scope.</li>
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<li>New packages must not have uppercase letters in the name.</li>
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<li>The name ends up being part of a URL, an argument on the command line,
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and a folder name. Therefore, the name can't contain any non-URL-safe
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characters.</li>
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</ul>
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<p>Some tips:</p>
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<ul>
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<li>Don't use the same name as a core Node module.</li>
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<li>Don't put "js" or "node" in the name. It's assumed that it's js, since
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you're writing a package.json file, and you can specify the engine using
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the "engines" field. (See below.)</li>
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<li>The name will probably be passed as an argument to require(), so it
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should be something short, but also reasonably descriptive.</li>
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<li>You may want to check the npm registry to see if there's something by
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that name already, before you get too attached to it.
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<a href="https://www.npmjs.com/">https://www.npmjs.com/</a></li>
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</ul>
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<p>A name can be optionally prefixed by a scope, e.g. <code>@myorg/mypackage</code>. See
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<a href="../using-npm/scope.html"><code>scope</code></a> for more detail.</p>
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<h3 id="version">version</h3>
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<p>If you plan to publish your package, the <em>most</em> important things in your
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package.json are the name and version fields as they will be required. The
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name and version together form an identifier that is assumed to be
|
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completely unique. Changes to the package should come along with changes
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to the version. If you don't plan to publish your package, the name and
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version fields are optional.</p>
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<p>Version must be parseable by
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<a href="https://github.com/npm/node-semver">node-semver</a>, which is bundled with
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npm as a dependency. (<code>npm install semver</code> to use it yourself.)</p>
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<h3 id="description2">description</h3>
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<p>Put a description in it. It's a string. This helps people discover your
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package, as it's listed in <code>npm search</code>.</p>
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<h3 id="keywords">keywords</h3>
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<p>Put keywords in it. It's an array of strings. This helps people discover
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your package as it's listed in <code>npm search</code>.</p>
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<h3 id="homepage">homepage</h3>
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<p>The url to the project homepage.</p>
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<p>Example:</p>
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<pre><code class="language-json">"homepage": "https://github.com/owner/project#readme"
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</code></pre>
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<h3 id="bugs">bugs</h3>
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<p>The url to your project's issue tracker and / or the email address to which
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issues should be reported. These are helpful for people who encounter
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issues with your package.</p>
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<p>It should look like this:</p>
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<pre><code class="language-json">{
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"url" : "https://github.com/owner/project/issues",
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"email" : "project@hostname.com"
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}
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</code></pre>
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<p>You can specify either one or both values. If you want to provide only a
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url, you can specify the value for "bugs" as a simple string instead of an
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object.</p>
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<p>If a url is provided, it will be used by the <code>npm bugs</code> command.</p>
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<h3 id="license">license</h3>
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<p>You should specify a license for your package so that people know how they
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are permitted to use it, and any restrictions you're placing on it.</p>
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<p>If you're using a common license such as BSD-2-Clause or MIT, add a current
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SPDX license identifier for the license you're using, like this:</p>
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<pre><code class="language-json">{
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"license" : "BSD-3-Clause"
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}
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</code></pre>
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<p>You can check <a href="https://spdx.org/licenses/">the full list of SPDX license
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IDs</a>. Ideally you should pick one that is
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<a href="https://opensource.org/licenses/">OSI</a> approved.</p>
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<p>If your package is licensed under multiple common licenses, use an <a href="https://spdx.dev/specifications/">SPDX
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license expression syntax version 2.0
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string</a>, like this:</p>
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<pre><code class="language-json">{
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"license" : "(ISC OR GPL-3.0)"
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}
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</code></pre>
|
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<p>If you are using a license that hasn't been assigned an SPDX identifier, or if
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you are using a custom license, use a string value like this one:</p>
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<pre><code class="language-json">{
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"license" : "SEE LICENSE IN <filename>"
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}
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</code></pre>
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<p>Then include a file named <code><filename></code> at the top level of the package.</p>
|
|
<p>Some old packages used license objects or a "licenses" property containing
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an array of license objects:</p>
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<pre><code class="language-json">// Not valid metadata
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{
|
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"license" : {
|
|
"type" : "ISC",
|
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"url" : "https://opensource.org/licenses/ISC"
|
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}
|
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}
|
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|
|
// Not valid metadata
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{
|
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"licenses" : [
|
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{
|
|
"type": "MIT",
|
|
"url": "https://www.opensource.org/licenses/mit-license.php"
|
|
},
|
|
{
|
|
"type": "Apache-2.0",
|
|
"url": "https://opensource.org/licenses/apache2.0.php"
|
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}
|
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]
|
|
}
|
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</code></pre>
|
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<p>Those styles are now deprecated. Instead, use SPDX expressions, like this:</p>
|
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<pre><code class="language-json">{
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"license": "ISC"
|
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}
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</code></pre>
|
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<pre><code class="language-json">{
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"license": "(MIT OR Apache-2.0)"
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}
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</code></pre>
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<p>Finally, if you do not wish to grant others the right to use a private or
|
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unpublished package under any terms:</p>
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<pre><code class="language-json">{
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"license": "UNLICENSED"
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}
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</code></pre>
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<p>Consider also setting <code>"private": true</code> to prevent accidental publication.</p>
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<h3 id="people-fields-author-contributors">people fields: author, contributors</h3>
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<p>The "author" is one person. "contributors" is an array of people. A
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"person" is an object with a "name" field and optionally "url" and "email",
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like this:</p>
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<pre><code class="language-json">{
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"name" : "Barney Rubble",
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"email" : "b@rubble.com",
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"url" : "http://barnyrubble.tumblr.com/"
|
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}
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</code></pre>
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<p>Or you can shorten that all into a single string, and npm will parse it for
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you:</p>
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<pre><code class="language-json">{
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"author": "Barney Rubble <b@rubble.com> (http://barnyrubble.tumblr.com/)"
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}
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</code></pre>
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<p>Both email and url are optional either way.</p>
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<p>npm also sets a top-level "maintainers" field with your npm user info.</p>
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<h3 id="funding">funding</h3>
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<p>You can specify an object containing a URL that provides up-to-date
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information about ways to help fund development of your package, or a
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string URL, or an array of these:</p>
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<pre><code class="language-json">{
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"funding": {
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"type" : "individual",
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"url" : "http://example.com/donate"
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},
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"funding": {
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"type" : "patreon",
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"url" : "https://www.patreon.com/my-account"
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},
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"funding": "http://example.com/donate",
|
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"funding": [
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{
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"type" : "individual",
|
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"url" : "http://example.com/donate"
|
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},
|
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"http://example.com/donateAlso",
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{
|
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"type" : "patreon",
|
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"url" : "https://www.patreon.com/my-account"
|
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}
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]
|
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}
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</code></pre>
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<p>Users can use the <code>npm fund</code> subcommand to list the <code>funding</code> URLs of all
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dependencies of their project, direct and indirect. A shortcut to visit
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each funding url is also available when providing the project name such as:
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<code>npm fund <projectname></code> (when there are multiple URLs, the first one will
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be visited)</p>
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<h3 id="files">files</h3>
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<p>The optional <code>files</code> field is an array of file patterns that describes the
|
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entries to be included when your package is installed as a dependency. File
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patterns follow a similar syntax to <code>.gitignore</code>, but reversed: including a
|
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file, directory, or glob pattern (<code>*</code>, <code>**/*</code>, and such) will make it so
|
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that file is included in the tarball when it's packed. Omitting the field
|
|
will make it default to <code>["*"]</code>, which means it will include all files.</p>
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<p>Some special files and directories are also included or excluded regardless
|
|
of whether they exist in the <code>files</code> array (see below).</p>
|
|
<p>You can also provide a <code>.npmignore</code> file in the root of your package or in
|
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subdirectories, which will keep files from being included. At the root of
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your package it will not override the "files" field, but in subdirectories
|
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it will. The <code>.npmignore</code> file works just like a <code>.gitignore</code>. If there is
|
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a <code>.gitignore</code> file, and <code>.npmignore</code> is missing, <code>.gitignore</code>'s contents
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will be used instead.</p>
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<p>Files included with the "package.json#files" field <em>cannot</em> be excluded
|
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through <code>.npmignore</code> or <code>.gitignore</code>.</p>
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<p>Certain files are always included, regardless of settings:</p>
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<ul>
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<li><code>package.json</code></li>
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<li><code>README</code></li>
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<li><code>LICENSE</code> / <code>LICENCE</code></li>
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<li>The file in the "main" field</li>
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</ul>
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<p><code>README</code> & <code>LICENSE</code> can have any case and extension.</p>
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<p>Conversely, some files are always ignored:</p>
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<ul>
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<li><code>.git</code></li>
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<li><code>CVS</code></li>
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<li><code>.svn</code></li>
|
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<li><code>.hg</code></li>
|
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<li><code>.lock-wscript</code></li>
|
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<li><code>.wafpickle-N</code></li>
|
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<li><code>.*.swp</code></li>
|
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<li><code>.DS_Store</code></li>
|
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<li><code>._*</code></li>
|
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<li><code>npm-debug.log</code></li>
|
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<li><code>.npmrc</code></li>
|
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<li><code>node_modules</code></li>
|
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<li><code>config.gypi</code></li>
|
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<li><code>*.orig</code></li>
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<li><code>package-lock.json</code> (use
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<a href="../configuring-npm/npm-shrinkwrap-json.html"><code>npm-shrinkwrap.json</code></a> if you wish
|
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it to be published)</li>
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</ul>
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<h3 id="main">main</h3>
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<p>The main field is a module ID that is the primary entry point to your
|
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program. That is, if your package is named <code>foo</code>, and a user installs it,
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and then does <code>require("foo")</code>, then your main module's exports object will
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be returned.</p>
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<p>This should be a module relative to the root of your package folder.</p>
|
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<p>For most modules, it makes the most sense to have a main script and often
|
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not much else.</p>
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<p>If <code>main</code> is not set it defaults to <code>index.js</code> in the package's root folder.</p>
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<h3 id="browser">browser</h3>
|
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<p>If your module is meant to be used client-side the browser field should be
|
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used instead of the main field. This is helpful to hint users that it might
|
|
rely on primitives that aren't available in Node.js modules. (e.g.
|
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<code>window</code>)</p>
|
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<h3 id="bin">bin</h3>
|
|
<p>A lot of packages have one or more executable files that they'd like to
|
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install into the PATH. npm makes this pretty easy (in fact, it uses this
|
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feature to install the "npm" executable.)</p>
|
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<p>To use this, supply a <code>bin</code> field in your package.json which is a map of
|
|
command name to local file name. When this package is installed globally,
|
|
that file will be either linked inside the global bins directory or
|
|
a cmd (Windows Command File) will be created which executes the specified
|
|
file in the <code>bin</code> field, so it is available to run by <code>name</code> or <code>name.cmd</code> (on
|
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Windows PowerShell). When this package is installed as a dependency in another
|
|
package, the file will be linked where it will be available to that package
|
|
either directly by <code>npm exec</code> or by name in other scripts when invoking them
|
|
via <code>npm run-script</code>.</p>
|
|
<p>For example, myapp could have this:</p>
|
|
<pre><code class="language-json">{
|
|
"bin": {
|
|
"myapp": "./cli.js"
|
|
}
|
|
}
|
|
</code></pre>
|
|
<p>So, when you install myapp, in case of unix-like OS it'll create a symlink
|
|
from the <code>cli.js</code> script to <code>/usr/local/bin/myapp</code> and in case of windows it
|
|
will create a cmd file usually at <code>C:\Users\{Username}\AppData\Roaming\npm\myapp.cmd</code>
|
|
which runs the <code>cli.js</code> script.</p>
|
|
<p>If you have a single executable, and its name should be the name of the
|
|
package, then you can just supply it as a string. For example:</p>
|
|
<pre><code class="language-json">{
|
|
"name": "my-program",
|
|
"version": "1.2.5",
|
|
"bin": "./path/to/program"
|
|
}
|
|
</code></pre>
|
|
<p>would be the same as this:</p>
|
|
<pre><code class="language-json">{
|
|
"name": "my-program",
|
|
"version": "1.2.5",
|
|
"bin": {
|
|
"my-program": "./path/to/program"
|
|
}
|
|
}
|
|
</code></pre>
|
|
<p>Please make sure that your file(s) referenced in <code>bin</code> starts with
|
|
<code>#!/usr/bin/env node</code>, otherwise the scripts are started without the node
|
|
executable!</p>
|
|
<p>Note that you can also set the executable files using <a href="#directoriesbin">directories.bin</a>.</p>
|
|
<p>See <a href="../configuring-npm/folders#executables.html">folders</a> for more info on
|
|
executables.</p>
|
|
<h3 id="man">man</h3>
|
|
<p>Specify either a single file or an array of filenames to put in place for
|
|
the <code>man</code> program to find.</p>
|
|
<p>If only a single file is provided, then it's installed such that it is the
|
|
result from <code>man <pkgname></code>, regardless of its actual filename. For
|
|
example:</p>
|
|
<pre><code class="language-json">{
|
|
"name": "foo",
|
|
"version": "1.2.3",
|
|
"description": "A packaged foo fooer for fooing foos",
|
|
"main": "foo.js",
|
|
"man": "./man/doc.1"
|
|
}
|
|
</code></pre>
|
|
<p>would link the <code>./man/doc.1</code> file in such that it is the target for <code>man foo</code></p>
|
|
<p>If the filename doesn't start with the package name, then it's prefixed.
|
|
So, this:</p>
|
|
<pre><code class="language-json">{
|
|
"name": "foo",
|
|
"version": "1.2.3",
|
|
"description": "A packaged foo fooer for fooing foos",
|
|
"main": "foo.js",
|
|
"man": [
|
|
"./man/foo.1",
|
|
"./man/bar.1"
|
|
]
|
|
}
|
|
</code></pre>
|
|
<p>will create files to do <code>man foo</code> and <code>man foo-bar</code>.</p>
|
|
<p>Man files must end with a number, and optionally a <code>.gz</code> suffix if they are
|
|
compressed. The number dictates which man section the file is installed
|
|
into.</p>
|
|
<pre><code class="language-json">{
|
|
"name": "foo",
|
|
"version": "1.2.3",
|
|
"description": "A packaged foo fooer for fooing foos",
|
|
"main": "foo.js",
|
|
"man": [
|
|
"./man/foo.1",
|
|
"./man/foo.2"
|
|
]
|
|
}
|
|
</code></pre>
|
|
<p>will create entries for <code>man foo</code> and <code>man 2 foo</code></p>
|
|
<h3 id="directories">directories</h3>
|
|
<p>The CommonJS <a href="http://wiki.commonjs.org/wiki/Packages/1.0">Packages</a> spec
|
|
details a few ways that you can indicate the structure of your package
|
|
using a <code>directories</code> object. If you look at <a href="https://registry.npmjs.org/npm/latest">npm's
|
|
package.json</a>, you'll see that it
|
|
has directories for doc, lib, and man.</p>
|
|
<p>In the future, this information may be used in other creative ways.</p>
|
|
<h4 id="directoriesbin">directories.bin</h4>
|
|
<p>If you specify a <code>bin</code> directory in <code>directories.bin</code>, all the files in
|
|
that folder will be added.</p>
|
|
<p>Because of the way the <code>bin</code> directive works, specifying both a <code>bin</code> path
|
|
and setting <code>directories.bin</code> is an error. If you want to specify
|
|
individual files, use <code>bin</code>, and for all the files in an existing <code>bin</code>
|
|
directory, use <code>directories.bin</code>.</p>
|
|
<h4 id="directoriesman">directories.man</h4>
|
|
<p>A folder that is full of man pages. Sugar to generate a "man" array by
|
|
walking the folder.</p>
|
|
<h3 id="repository">repository</h3>
|
|
<p>Specify the place where your code lives. This is helpful for people who
|
|
want to contribute. If the git repo is on GitHub, then the <code>npm docs</code>
|
|
command will be able to find you.</p>
|
|
<p>Do it like this:</p>
|
|
<pre><code class="language-json">{
|
|
"repository": {
|
|
"type": "git",
|
|
"url": "https://github.com/npm/cli.git"
|
|
}
|
|
}
|
|
</code></pre>
|
|
<p>The URL should be a publicly available (perhaps read-only) url that can be
|
|
handed directly to a VCS program without any modification. It should not
|
|
be a url to an html project page that you put in your browser. It's for
|
|
computers.</p>
|
|
<p>For GitHub, GitHub gist, Bitbucket, or GitLab repositories you can use the
|
|
same shortcut syntax you use for <code>npm install</code>:</p>
|
|
<pre><code class="language-json">{
|
|
"repository": "npm/npm",
|
|
|
|
"repository": "github:user/repo",
|
|
|
|
"repository": "gist:11081aaa281",
|
|
|
|
"repository": "bitbucket:user/repo",
|
|
|
|
"repository": "gitlab:user/repo"
|
|
}
|
|
</code></pre>
|
|
<p>If the <code>package.json</code> for your package is not in the root directory (for
|
|
example if it is part of a monorepo), you can specify the directory in
|
|
which it lives:</p>
|
|
<pre><code class="language-json">{
|
|
"repository": {
|
|
"type": "git",
|
|
"url": "https://github.com/facebook/react.git",
|
|
"directory": "packages/react-dom"
|
|
}
|
|
}
|
|
</code></pre>
|
|
<h3 id="scripts">scripts</h3>
|
|
<p>The "scripts" property is a dictionary containing script commands that are
|
|
run at various times in the lifecycle of your package. The key is the
|
|
lifecycle event, and the value is the command to run at that point.</p>
|
|
<p>See <a href="../using-npm/scripts.html"><code>scripts</code></a> to find out more about writing package
|
|
scripts.</p>
|
|
<h3 id="config">config</h3>
|
|
<p>A "config" object can be used to set configuration parameters used in
|
|
package scripts that persist across upgrades. For instance, if a package
|
|
had the following:</p>
|
|
<pre><code class="language-json">{
|
|
"name": "foo",
|
|
"config": {
|
|
"port": "8080"
|
|
}
|
|
}
|
|
</code></pre>
|
|
<p>It could also have a "start" command that referenced the
|
|
<code>npm_package_config_port</code> environment variable.</p>
|
|
<h3 id="dependencies">dependencies</h3>
|
|
<p>Dependencies are specified in a simple object that maps a package name to a
|
|
version range. The version range is a string which has one or more
|
|
space-separated descriptors. Dependencies can also be identified with a
|
|
tarball or git URL.</p>
|
|
<p><strong>Please do not put test harnesses or transpilers or other "development"
|
|
time tools in your <code>dependencies</code> object.</strong> See <code>devDependencies</code>, below.</p>
|
|
<p>See <a href="https://github.com/npm/node-semver#versions">semver</a> for more details about specifying version ranges.</p>
|
|
<ul>
|
|
<li><code>version</code> Must match <code>version</code> exactly</li>
|
|
<li><code>>version</code> Must be greater than <code>version</code></li>
|
|
<li><code>>=version</code> etc</li>
|
|
<li><code><version</code></li>
|
|
<li><code><=version</code></li>
|
|
<li><code>~version</code> "Approximately equivalent to version" See
|
|
<a href="https://github.com/npm/node-semver#versions">semver</a></li>
|
|
<li><code>^version</code> "Compatible with version" See <a href="https://github.com/npm/node-semver#versions">semver</a></li>
|
|
<li><code>1.2.x</code> 1.2.0, 1.2.1, etc., but not 1.3.0</li>
|
|
<li><code>http://...</code> See 'URLs as Dependencies' below</li>
|
|
<li><code>*</code> Matches any version</li>
|
|
<li><code>""</code> (just an empty string) Same as <code>*</code></li>
|
|
<li><code>version1 - version2</code> Same as <code>>=version1 <=version2</code>.</li>
|
|
<li><code>range1 || range2</code> Passes if either range1 or range2 are satisfied.</li>
|
|
<li><code>git...</code> See 'Git URLs as Dependencies' below</li>
|
|
<li><code>user/repo</code> See 'GitHub URLs' below</li>
|
|
<li><code>tag</code> A specific version tagged and published as <code>tag</code> See <a href="../commands/npm-dist-tag.html"><code>npm dist-tag</code></a></li>
|
|
<li><code>path/path/path</code> See <a href="#local-paths">Local Paths</a> below</li>
|
|
</ul>
|
|
<p>For example, these are all valid:</p>
|
|
<pre><code class="language-json">{
|
|
"dependencies": {
|
|
"foo": "1.0.0 - 2.9999.9999",
|
|
"bar": ">=1.0.2 <2.1.2",
|
|
"baz": ">1.0.2 <=2.3.4",
|
|
"boo": "2.0.1",
|
|
"qux": "<1.0.0 || >=2.3.1 <2.4.5 || >=2.5.2 <3.0.0",
|
|
"asd": "http://asdf.com/asdf.tar.gz",
|
|
"til": "~1.2",
|
|
"elf": "~1.2.3",
|
|
"two": "2.x",
|
|
"thr": "3.3.x",
|
|
"lat": "latest",
|
|
"dyl": "file:../dyl"
|
|
}
|
|
}
|
|
</code></pre>
|
|
<h4 id="urls-as-dependencies">URLs as Dependencies</h4>
|
|
<p>You may specify a tarball URL in place of a version range.</p>
|
|
<p>This tarball will be downloaded and installed locally to your package at
|
|
install time.</p>
|
|
<h4 id="git-urls-as-dependencies">Git URLs as Dependencies</h4>
|
|
<p>Git urls are of the form:</p>
|
|
<pre><code class="language-bash"><protocol>://[<user>[:<password>]@]<hostname>[:<port>][:][/]<path>[#<commit-ish> | #semver:<semver>]
|
|
</code></pre>
|
|
<p><code><protocol></code> is one of <code>git</code>, <code>git+ssh</code>, <code>git+http</code>, <code>git+https</code>, or
|
|
<code>git+file</code>.</p>
|
|
<p>If <code>#<commit-ish></code> is provided, it will be used to clone exactly that
|
|
commit. If the commit-ish has the format <code>#semver:<semver></code>, <code><semver></code> can
|
|
be any valid semver range or exact version, and npm will look for any tags
|
|
or refs matching that range in the remote repository, much as it would for
|
|
a registry dependency. If neither <code>#<commit-ish></code> or <code>#semver:<semver></code> is
|
|
specified, then the default branch is used.</p>
|
|
<p>Examples:</p>
|
|
<pre><code class="language-bash">git+ssh://git@github.com:npm/cli.git#v1.0.27
|
|
git+ssh://git@github.com:npm/cli#semver:^5.0
|
|
git+https://isaacs@github.com/npm/cli.git
|
|
git://github.com/npm/cli.git#v1.0.27
|
|
</code></pre>
|
|
<p>When installing from a <code>git</code> repository, the presence of certain fields in the
|
|
<code>package.json</code> will cause npm to believe it needs to perform a build. To do so
|
|
your repository will be cloned into a temporary directory, all of its deps
|
|
installed, relevant scripts run, and the resulting directory packed and
|
|
installed.</p>
|
|
<p>This flow will occur if your git dependency uses <code>workspaces</code>, or if any of the
|
|
following scripts are present:</p>
|
|
<ul>
|
|
<li><code>build</code></li>
|
|
<li><code>prepare</code></li>
|
|
<li><code>prepack</code></li>
|
|
<li><code>preinstall</code></li>
|
|
<li><code>install</code></li>
|
|
<li><code>postinstall</code></li>
|
|
</ul>
|
|
<p>If your git repository includes pre-built artifacts, you will likely want to
|
|
make sure that none of the above scripts are defined, or your dependency
|
|
will be rebuilt for every installation.</p>
|
|
<h4 id="github-urls">GitHub URLs</h4>
|
|
<p>As of version 1.1.65, you can refer to GitHub urls as just "foo":
|
|
"user/foo-project". Just as with git URLs, a <code>commit-ish</code> suffix can be
|
|
included. For example:</p>
|
|
<pre><code class="language-json">{
|
|
"name": "foo",
|
|
"version": "0.0.0",
|
|
"dependencies": {
|
|
"express": "expressjs/express",
|
|
"mocha": "mochajs/mocha#4727d357ea",
|
|
"module": "user/repo#feature\/branch"
|
|
}
|
|
}
|
|
</code></pre>
|
|
<h4 id="local-paths">Local Paths</h4>
|
|
<p>As of version 2.0.0 you can provide a path to a local directory that
|
|
contains a package. Local paths can be saved using <code>npm install -S</code> or <code>npm install --save</code>, using any of these forms:</p>
|
|
<pre><code class="language-bash">../foo/bar
|
|
~/foo/bar
|
|
./foo/bar
|
|
/foo/bar
|
|
</code></pre>
|
|
<p>in which case they will be normalized to a relative path and added to your
|
|
<code>package.json</code>. For example:</p>
|
|
<pre><code class="language-json">{
|
|
"name": "baz",
|
|
"dependencies": {
|
|
"bar": "file:../foo/bar"
|
|
}
|
|
}
|
|
</code></pre>
|
|
<p>This feature is helpful for local offline development and creating tests
|
|
that require npm installing where you don't want to hit an external server,
|
|
but should not be used when publishing packages to the public registry.</p>
|
|
<p><em>note</em>: Packages linked by local path will not have their own
|
|
dependencies installed when <code>npm install</code> is ran in this case. You must
|
|
run <code>npm install</code> from inside the local path itself.</p>
|
|
<h3 id="devdependencies">devDependencies</h3>
|
|
<p>If someone is planning on downloading and using your module in their
|
|
program, then they probably don't want or need to download and build the
|
|
external test or documentation framework that you use.</p>
|
|
<p>In this case, it's best to map these additional items in a
|
|
<code>devDependencies</code> object.</p>
|
|
<p>These things will be installed when doing <code>npm link</code> or <code>npm install</code> from
|
|
the root of a package, and can be managed like any other npm configuration
|
|
param. See <a href="../using-npm/config.html"><code>config</code></a> for more on the topic.</p>
|
|
<p>For build steps that are not platform-specific, such as compiling
|
|
CoffeeScript or other languages to JavaScript, use the <code>prepare</code> script to
|
|
do this, and make the required package a devDependency.</p>
|
|
<p>For example:</p>
|
|
<pre><code class="language-json">{
|
|
"name": "ethopia-waza",
|
|
"description": "a delightfully fruity coffee varietal",
|
|
"version": "1.2.3",
|
|
"devDependencies": {
|
|
"coffee-script": "~1.6.3"
|
|
},
|
|
"scripts": {
|
|
"prepare": "coffee -o lib/ -c src/waza.coffee"
|
|
},
|
|
"main": "lib/waza.js"
|
|
}
|
|
</code></pre>
|
|
<p>The <code>prepare</code> script will be run before publishing, so that users can
|
|
consume the functionality without requiring them to compile it themselves.
|
|
In dev mode (ie, locally running <code>npm install</code>), it'll run this script as
|
|
well, so that you can test it easily.</p>
|
|
<h3 id="peerdependencies">peerDependencies</h3>
|
|
<p>In some cases, you want to express the compatibility of your package with a
|
|
host tool or library, while not necessarily doing a <code>require</code> of this host.
|
|
This is usually referred to as a <em>plugin</em>. Notably, your module may be
|
|
exposing a specific interface, expected and specified by the host
|
|
documentation.</p>
|
|
<p>For example:</p>
|
|
<pre><code class="language-json">{
|
|
"name": "tea-latte",
|
|
"version": "1.3.5",
|
|
"peerDependencies": {
|
|
"tea": "2.x"
|
|
}
|
|
}
|
|
</code></pre>
|
|
<p>This ensures your package <code>tea-latte</code> can be installed <em>along</em> with the
|
|
second major version of the host package <code>tea</code> only. <code>npm install tea-latte</code> could possibly yield the following dependency graph:</p>
|
|
<pre><code class="language-bash">├── tea-latte@1.3.5
|
|
└── tea@2.2.0
|
|
</code></pre>
|
|
<p>In npm versions 3 through 6, <code>peerDependencies</code> were not automatically
|
|
installed, and would raise a warning if an invalid version of the peer
|
|
dependency was found in the tree. As of npm v7, peerDependencies <em>are</em>
|
|
installed by default.</p>
|
|
<p>Trying to install another plugin with a conflicting requirement may cause
|
|
an error if the tree cannot be resolved correctly. For this reason, make
|
|
sure your plugin requirement is as broad as possible, and not to lock it
|
|
down to specific patch versions.</p>
|
|
<p>Assuming the host complies with <a href="https://semver.org/">semver</a>, only changes
|
|
in the host package's major version will break your plugin. Thus, if you've
|
|
worked with every 1.x version of the host package, use <code>"^1.0"</code> or <code>"1.x"</code>
|
|
to express this. If you depend on features introduced in 1.5.2, use
|
|
<code>"^1.5.2"</code>.</p>
|
|
<h3 id="peerdependenciesmeta">peerDependenciesMeta</h3>
|
|
<p>When a user installs your package, npm will emit warnings if packages
|
|
specified in <code>peerDependencies</code> are not already installed. The
|
|
<code>peerDependenciesMeta</code> field serves to provide npm more information on how
|
|
your peer dependencies are to be used. Specifically, it allows peer
|
|
dependencies to be marked as optional.</p>
|
|
<p>For example:</p>
|
|
<pre><code class="language-json">{
|
|
"name": "tea-latte",
|
|
"version": "1.3.5",
|
|
"peerDependencies": {
|
|
"tea": "2.x",
|
|
"soy-milk": "1.2"
|
|
},
|
|
"peerDependenciesMeta": {
|
|
"soy-milk": {
|
|
"optional": true
|
|
}
|
|
}
|
|
}
|
|
</code></pre>
|
|
<p>Marking a peer dependency as optional ensures npm will not emit a warning
|
|
if the <code>soy-milk</code> package is not installed on the host. This allows you to
|
|
integrate and interact with a variety of host packages without requiring
|
|
all of them to be installed.</p>
|
|
<h3 id="bundledependencies">bundleDependencies</h3>
|
|
<p>This defines an array of package names that will be bundled when publishing
|
|
the package.</p>
|
|
<p>In cases where you need to preserve npm packages locally or have them
|
|
available through a single file download, you can bundle the packages in a
|
|
tarball file by specifying the package names in the <code>bundleDependencies</code>
|
|
array and executing <code>npm pack</code>.</p>
|
|
<p>For example:</p>
|
|
<p>If we define a package.json like this:</p>
|
|
<pre><code class="language-json">{
|
|
"name": "awesome-web-framework",
|
|
"version": "1.0.0",
|
|
"bundleDependencies": [
|
|
"renderized",
|
|
"super-streams"
|
|
]
|
|
}
|
|
</code></pre>
|
|
<p>we can obtain <code>awesome-web-framework-1.0.0.tgz</code> file by running <code>npm pack</code>.
|
|
This file contains the dependencies <code>renderized</code> and <code>super-streams</code> which
|
|
can be installed in a new project by executing <code>npm install awesome-web-framework-1.0.0.tgz</code>. Note that the package names do not
|
|
include any versions, as that information is specified in <code>dependencies</code>.</p>
|
|
<p>If this is spelled <code>"bundledDependencies"</code>, then that is also honored.</p>
|
|
<p>Alternatively, <code>"bundleDependencies"</code> can be defined as a boolean value. A
|
|
value of <code>true</code> will bundle all dependencies, a value of <code>false</code> will bundle
|
|
none.</p>
|
|
<h3 id="optionaldependencies">optionalDependencies</h3>
|
|
<p>If a dependency can be used, but you would like npm to proceed if it cannot
|
|
be found or fails to install, then you may put it in the
|
|
<code>optionalDependencies</code> object. This is a map of package name to version or
|
|
url, just like the <code>dependencies</code> object. The difference is that build
|
|
failures do not cause installation to fail. Running <code>npm install --omit=optional</code> will prevent these dependencies from being installed.</p>
|
|
<p>It is still your program's responsibility to handle the lack of the
|
|
dependency. For example, something like this:</p>
|
|
<pre><code class="language-js">try {
|
|
var foo = require('foo')
|
|
var fooVersion = require('foo/package.json').version
|
|
} catch (er) {
|
|
foo = null
|
|
}
|
|
if ( notGoodFooVersion(fooVersion) ) {
|
|
foo = null
|
|
}
|
|
|
|
// .. then later in your program ..
|
|
|
|
if (foo) {
|
|
foo.doFooThings()
|
|
}
|
|
</code></pre>
|
|
<p>Entries in <code>optionalDependencies</code> will override entries of the same name in
|
|
<code>dependencies</code>, so it's usually best to only put in one place.</p>
|
|
<h3 id="overrides">overrides</h3>
|
|
<p>If you need to make specific changes to dependencies of your dependencies, for
|
|
example replacing the version of a dependency with a known security issue,
|
|
replacing an existing dependency with a fork, or making sure that the same
|
|
version of a package is used everywhere, then you may add an override.</p>
|
|
<p>Overrides provide a way to replace a package in your dependency tree with
|
|
another version, or another package entirely. These changes can be scoped as
|
|
specific or as vague as desired.</p>
|
|
<p>To make sure the package <code>foo</code> is always installed as version <code>1.0.0</code> no matter
|
|
what version your dependencies rely on:</p>
|
|
<pre><code class="language-json">{
|
|
"overrides": {
|
|
"foo": "1.0.0"
|
|
}
|
|
}
|
|
</code></pre>
|
|
<p>The above is a short hand notation, the full object form can be used to allow
|
|
overriding a package itself as well as a child of the package. This will cause
|
|
<code>foo</code> to always be <code>1.0.0</code> while also making <code>bar</code> at any depth beyond <code>foo</code>
|
|
also <code>1.0.0</code>:</p>
|
|
<pre><code class="language-json">{
|
|
"overrides": {
|
|
"foo": {
|
|
".": "1.0.0",
|
|
"bar": "1.0.0"
|
|
}
|
|
}
|
|
}
|
|
</code></pre>
|
|
<p>To only override <code>foo</code> to be <code>1.0.0</code> when it's a child (or grandchild, or great
|
|
grandchild, etc) of the package <code>bar</code>:</p>
|
|
<pre><code class="language-json">{
|
|
"overrides": {
|
|
"bar": {
|
|
"foo": "1.0.0"
|
|
}
|
|
}
|
|
}
|
|
</code></pre>
|
|
<p>Keys can be nested to any arbitrary length. To override <code>foo</code> only when it's a
|
|
child of <code>bar</code> and only when <code>bar</code> is a child of <code>baz</code>:</p>
|
|
<pre><code class="language-json">{
|
|
"overrides": {
|
|
"baz": {
|
|
"bar": {
|
|
"foo": "1.0.0"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
</code></pre>
|
|
<p>The key of an override can also include a version, or range of versions.
|
|
To override <code>foo</code> to <code>1.0.0</code>, but only when it's a child of <code>bar@2.0.0</code>:</p>
|
|
<pre><code class="language-json">{
|
|
"overrides": {
|
|
"bar@2.0.0": {
|
|
"foo": "1.0.0"
|
|
}
|
|
}
|
|
}
|
|
</code></pre>
|
|
<p>You may not set an override for a package that you directly depend on unless
|
|
both the dependency and the override itself share the exact same spec. To make
|
|
this limitation easier to deal with, overrides may also be defined as a
|
|
reference to a spec for a direct dependency by prefixing the name of the
|
|
package you wish the version to match with a <code>$</code>.</p>
|
|
<pre><code class="language-json">{
|
|
"dependencies": {
|
|
"foo": "^1.0.0"
|
|
},
|
|
"overrides": {
|
|
// BAD, will throw an EOVERRIDE error
|
|
// "foo": "^2.0.0"
|
|
// GOOD, specs match so override is allowed
|
|
// "foo": "^1.0.0"
|
|
// BEST, the override is defined as a reference to the dependency
|
|
"foo": "$foo",
|
|
// the referenced package does not need to match the overridden one
|
|
"bar": "$foo"
|
|
}
|
|
}
|
|
</code></pre>
|
|
<h3 id="engines">engines</h3>
|
|
<p>You can specify the version of node that your stuff works on:</p>
|
|
<pre><code class="language-json">{
|
|
"engines": {
|
|
"node": ">=0.10.3 <15"
|
|
}
|
|
}
|
|
</code></pre>
|
|
<p>And, like with dependencies, if you don't specify the version (or if you
|
|
specify "*" as the version), then any version of node will do.</p>
|
|
<p>You can also use the "engines" field to specify which versions of npm are
|
|
capable of properly installing your program. For example:</p>
|
|
<pre><code class="language-json">{
|
|
"engines": {
|
|
"npm": "~1.0.20"
|
|
}
|
|
}
|
|
</code></pre>
|
|
<p>Unless the user has set the
|
|
<a href="../using-npm/config#engine-strict.html"><code>engine-strict</code> config</a> flag, this field is
|
|
advisory only and will only produce warnings when your package is installed as a
|
|
dependency.</p>
|
|
<h3 id="os">os</h3>
|
|
<p>You can specify which operating systems your
|
|
module will run on:</p>
|
|
<pre><code class="language-json">{
|
|
"os": [
|
|
"darwin",
|
|
"linux"
|
|
]
|
|
}
|
|
</code></pre>
|
|
<p>You can also block instead of allowing operating systems, just prepend the
|
|
blocked os with a '!':</p>
|
|
<pre><code class="language-json">{
|
|
"os": [
|
|
"!win32"
|
|
]
|
|
}
|
|
</code></pre>
|
|
<p>The host operating system is determined by <code>process.platform</code></p>
|
|
<p>It is allowed to both block and allow an item, although there isn't any
|
|
good reason to do this.</p>
|
|
<h3 id="cpu">cpu</h3>
|
|
<p>If your code only runs on certain cpu architectures,
|
|
you can specify which ones.</p>
|
|
<pre><code class="language-json">{
|
|
"cpu": [
|
|
"x64",
|
|
"ia32"
|
|
]
|
|
}
|
|
</code></pre>
|
|
<p>Like the <code>os</code> option, you can also block architectures:</p>
|
|
<pre><code class="language-json">{
|
|
"cpu": [
|
|
"!arm",
|
|
"!mips"
|
|
]
|
|
}
|
|
</code></pre>
|
|
<p>The host architecture is determined by <code>process.arch</code></p>
|
|
<h3 id="private">private</h3>
|
|
<p>If you set <code>"private": true</code> in your package.json, then npm will refuse to
|
|
publish it.</p>
|
|
<p>This is a way to prevent accidental publication of private repositories.
|
|
If you would like to ensure that a given package is only ever published to
|
|
a specific registry (for example, an internal registry), then use the
|
|
<code>publishConfig</code> dictionary described below to override the <code>registry</code>
|
|
config param at publish-time.</p>
|
|
<h3 id="publishconfig">publishConfig</h3>
|
|
<p>This is a set of config values that will be used at publish-time. It's
|
|
especially handy if you want to set the tag, registry or access, so that
|
|
you can ensure that a given package is not tagged with "latest", published
|
|
to the global public registry or that a scoped module is private by
|
|
default.</p>
|
|
<p>See <a href="../using-npm/config.html"><code>config</code></a> to see the list of config options that
|
|
can be overridden.</p>
|
|
<h3 id="workspaces">workspaces</h3>
|
|
<p>The optional <code>workspaces</code> field is an array of file patterns that describes
|
|
locations within the local file system that the install client should look
|
|
up to find each <a href="../using-npm/workspaces.html">workspace</a> that needs to be
|
|
symlinked to the top level <code>node_modules</code> folder.</p>
|
|
<p>It can describe either the direct paths of the folders to be used as
|
|
workspaces or it can define globs that will resolve to these same folders.</p>
|
|
<p>In the following example, all folders located inside the folder
|
|
<code>./packages</code> will be treated as workspaces as long as they have valid
|
|
<code>package.json</code> files inside them:</p>
|
|
<pre><code class="language-json">{
|
|
"name": "workspace-example",
|
|
"workspaces": [
|
|
"./packages/*"
|
|
]
|
|
}
|
|
</code></pre>
|
|
<p>See <a href="../using-npm/workspaces.html"><code>workspaces</code></a> for more examples.</p>
|
|
<h3 id="default-values">DEFAULT VALUES</h3>
|
|
<p>npm will default some values based on package contents.</p>
|
|
<ul>
|
|
<li>
|
|
<p><code>"scripts": {"start": "node server.js"}</code></p>
|
|
<p>If there is a <code>server.js</code> file in the root of your package, then npm will
|
|
default the <code>start</code> command to <code>node server.js</code>.</p>
|
|
</li>
|
|
<li>
|
|
<p><code>"scripts":{"install": "node-gyp rebuild"}</code></p>
|
|
<p>If there is a <code>binding.gyp</code> file in the root of your package and you have
|
|
not defined an <code>install</code> or <code>preinstall</code> script, npm will default the
|
|
<code>install</code> command to compile using node-gyp.</p>
|
|
</li>
|
|
<li>
|
|
<p><code>"contributors": [...]</code></p>
|
|
<p>If there is an <code>AUTHORS</code> file in the root of your package, npm will treat
|
|
each line as a <code>Name <email> (url)</code> format, where email and url are
|
|
optional. Lines which start with a <code>#</code> or are blank, will be ignored.</p>
|
|
</li>
|
|
</ul>
|
|
<h3 id="see-also">SEE ALSO</h3>
|
|
<ul>
|
|
<li><a href="https://github.com/npm/node-semver#versions">semver</a></li>
|
|
<li><a href="../using-npm/workspaces.html">workspaces</a></li>
|
|
<li><a href="../commands/npm-init.html">npm init</a></li>
|
|
<li><a href="../commands/npm-version.html">npm version</a></li>
|
|
<li><a href="../commands/npm-config.html">npm config</a></li>
|
|
<li><a href="../commands/npm-help.html">npm help</a></li>
|
|
<li><a href="../commands/npm-install.html">npm install</a></li>
|
|
<li><a href="../commands/npm-publish.html">npm publish</a></li>
|
|
<li><a href="../commands/npm-uninstall.html">npm uninstall</a></li>
|
|
</ul></div>
|
|
|
|
<footer id="edit">
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<a href="https://github.com/npm/cli/edit/latest/docs/content/configuring-npm/package-json.md">
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