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<h1><a href="../files/package.json.html">package.json</a></h1> <p>Specifics of npm's package.json handling</p>
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<h2 id="description">DESCRIPTION</h2>
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<p>This document is all you need to know about what's required in your package.json
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file. It must be actual JSON, not just a JavaScript object 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 <code><a href="../misc/npm-config.html">npm-config(7)</a></code>.</p>
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<h2 id="name">name</h2>
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<p>The <em>most</em> important things in your package.json are the name and version fields.
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Those are actually required, and your package won't install without
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them. The name and version together form an identifier that is assumed
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to be completely unique. Changes to the package should come along with
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changes to the version.</p>
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<p>The name is what your thing is called. Some tips:</p>
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<ul>
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<li>Don't put "js" or "node" in the name. It's assumed that it's js, since you're
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writing a package.json file, and you can specify the engine using the "engines"
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field. (See below.)</li>
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<li>The name ends up being part of a URL, an argument on the command line, and a
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folder name. Any name with non-url-safe characters will be rejected.
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Also, it can't start with a dot or an underscore.</li>
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<li>The name will probably be passed as an argument to require(), so it should
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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 that name
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already, before you get too attached to it. <a href="http://registry.npmjs.org/">http://registry.npmjs.org/</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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<code><a href="../misc/npm-scope.html">npm-scope(7)</a></code> for more detail.</p>
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<h2 id="version">version</h2>
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<p>The <em>most</em> important things in your package.json are the name and version fields.
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Those are actually required, and your package won't install without
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them. The name and version together form an identifier that is assumed
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to be completely unique. Changes to the package should come along with
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changes to the version.</p>
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<p>Version must be parseable by
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<a href="https://github.com/isaacs/node-semver">node-semver</a>, which is bundled
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with npm as a dependency. (<code>npm install semver</code> to use it yourself.)</p>
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<p>More on version numbers and ranges at <a href="../misc/semver.html">semver(7)</a>.</p>
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<h2 id="description">description</h2>
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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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<h2 id="keywords">keywords</h2>
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<p>Put keywords in it. It's an array of strings. This helps people
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discover your package as it's listed in <code>npm search</code>.</p>
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<h2 id="homepage">homepage</h2>
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<p>The url to the project homepage.</p>
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<p><strong>NOTE</strong>: This is <em>not</em> the same as "url". If you put a "url" field,
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then the registry will think it's a redirection to your package that has
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been published somewhere else, and spit at you.</p>
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<p>Literally. Spit. I'm so not kidding.</p>
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<h2 id="bugs">bugs</h2>
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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 issues
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with your package.</p>
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<p>It should look like this:</p>
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<pre><code>{ "url" : "http://github.com/owner/project/issues"
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, "email" : "project@hostname.com"
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}
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</code></pre><p>You can specify either one or both values. If you want to provide only a url,
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you can specify the value for "bugs" as a simple string instead of an 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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<h2 id="license">license</h2>
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<p>You should specify a license for your package so that people know how they are
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permitted to use it, and any restrictions you're placing on it.</p>
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<p>The simplest way, assuming you're using a common license such as BSD-3-Clause
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or MIT, is to just specify the standard SPDX ID of the license you're using,
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like this:</p>
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<pre><code>{ "license" : "BSD-3-Clause" }
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</code></pre><p>You can check <a href="https://spdx.org/licenses/">the full list of SPDX license IDs</a>.
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Ideally you should pick one that is
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<a href="http://opensource.org/licenses/alphabetical">OSI</a> approved.</p>
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<p>It's also a good idea to include a LICENSE file at the top level in
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your package.</p>
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<h2 id="people-fields-author-contributors">people fields: author, contributors</h2>
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<p>The "author" is one person. "contributors" is an array of people. A "person"
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is an object with a "name" field and optionally "url" and "email", like this:</p>
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<pre><code>{ "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><p>Or you can shorten that all into a single string, and npm will parse it for you:</p>
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<pre><code>"Barney Rubble <b@rubble.com> (http://barnyrubble.tumblr.com/)
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</code></pre><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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<h2 id="files">files</h2>
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<p>The "files" field is an array of files to include in your project. If
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you name a folder in the array, then it will also include the files
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inside that folder. (Unless they would be ignored by another rule.)</p>
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<p>You can also provide a ".npmignore" file in the root of your package,
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which will keep files from being included, even if they would be picked
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up by the files array. The ".npmignore" file works just like a
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".gitignore".</p>
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<h2 id="main">main</h2>
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<p>The main field is a module ID that is the primary entry point to your program.
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That is, if your package is named <code>foo</code>, and a user installs it, and then does
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<code>require("foo")</code>, then your main module's exports object will be returned.</p>
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<p>This should be a module ID 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 not
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much else.</p>
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<h2 id="bin">bin</h2>
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<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
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command name to local file name. On install, npm will symlink that file into
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<code>prefix/bin</code> for global installs, or <code>./node_modules/.bin/</code> for local
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installs.</p>
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<p>For example, npm has this:</p>
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<pre><code>{ "bin" : { "npm" : "./cli.js" } }
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</code></pre><p>So, when you install npm, it'll create a symlink from the <code>cli.js</code> script to
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<code>/usr/local/bin/npm</code>.</p>
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<p>If you have a single executable, and its name should be the name
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of the package, then you can just supply it as a string. For example:</p>
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<pre><code>{ "name": "my-program"
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, "version": "1.2.5"
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, "bin": "./path/to/program" }
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</code></pre><p>would be the same as this:</p>
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<pre><code>{ "name": "my-program"
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, "version": "1.2.5"
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, "bin" : { "my-program" : "./path/to/program" } }
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</code></pre><h2 id="man">man</h2>
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<p>Specify either a single file or an array of filenames to put in place for the
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<code>man</code> program to find.</p>
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<p>If only a single file is provided, then it's installed such that it is the
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result from <code>man <pkgname></code>, regardless of its actual filename. For example:</p>
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<pre><code>{ "name" : "foo"
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, "version" : "1.2.3"
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, "description" : "A packaged foo fooer for fooing foos"
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, "main" : "foo.js"
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, "man" : "./man/doc.1"
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}
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</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>
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<p>If the filename doesn't start with the package name, then it's prefixed.
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So, this:</p>
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<pre><code>{ "name" : "foo"
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, "version" : "1.2.3"
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, "description" : "A packaged foo fooer for fooing foos"
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, "main" : "foo.js"
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, "man" : [ "./man/foo.1", "./man/bar.1" ]
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}
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</code></pre><p>will create files to do <code>man foo</code> and <code>man foo-bar</code>.</p>
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<p>Man files must end with a number, and optionally a <code>.gz</code> suffix if they are
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compressed. The number dictates which man section the file is installed into.</p>
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<pre><code>{ "name" : "foo"
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, "version" : "1.2.3"
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, "description" : "A packaged foo fooer for fooing foos"
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, "main" : "foo.js"
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, "man" : [ "./man/foo.1", "./man/foo.2" ]
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}
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</code></pre><p>will create entries for <code>man foo</code> and <code>man 2 foo</code></p>
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<h2 id="directories">directories</h2>
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<p>The CommonJS <a href="http://wiki.commonjs.org/wiki/Packages/1.0">Packages</a> spec details a
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few ways that you can indicate the structure of your package using a <code>directories</code>
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object. If you look at <a href="http://registry.npmjs.org/npm/latest">npm's package.json</a>,
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you'll see that it has directories for doc, lib, and man.</p>
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<p>In the future, this information may be used in other creative ways.</p>
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<h3 id="directories-lib">directories.lib</h3>
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<p>Tell people where the bulk of your library is. Nothing special is done
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with the lib folder in any way, but it's useful meta info.</p>
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<h3 id="directories-bin">directories.bin</h3>
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<p>If you specify a <code>bin</code> directory, then all the files in that folder will
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be added as children of the <code>bin</code> path.</p>
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<p>If you have a <code>bin</code> path already, then this has no effect.</p>
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<h3 id="directories-man">directories.man</h3>
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<p>A folder that is full of man pages. Sugar to generate a "man" array by
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walking the folder.</p>
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<h3 id="directories-doc">directories.doc</h3>
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<p>Put markdown files in here. Eventually, these will be displayed nicely,
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maybe, someday.</p>
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<h3 id="directories-example">directories.example</h3>
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<p>Put example scripts in here. Someday, it might be exposed in some clever way.</p>
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<h2 id="repository">repository</h2>
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<p>Specify the place where your code lives. This is helpful for people who
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want to contribute. If the git repo is on github, then the <code>npm docs</code>
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command will be able to find you.</p>
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<p>Do it like this:</p>
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<pre><code>"repository" :
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{ "type" : "git"
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, "url" : "http://github.com/npm/npm.git"
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}
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"repository" :
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{ "type" : "svn"
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, "url" : "http://v8.googlecode.com/svn/trunk/"
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}
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</code></pre><p>The URL should be a publicly available (perhaps read-only) url that can be handed
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directly to a VCS program without any modification. It should not be a url to an
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html project page that you put in your browser. It's for computers.</p>
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<h2 id="scripts">scripts</h2>
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<p>The "scripts" property is a dictionary containing script commands that are run
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at various times in the lifecycle of your package. The key is the lifecycle
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event, and the value is the command to run at that point.</p>
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<p>See <code><a href="../misc/npm-scripts.html">npm-scripts(7)</a></code> to find out more about writing package scripts.</p>
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<h2 id="config">config</h2>
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<p>A "config" object can be used to set configuration parameters used in package
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scripts that persist across upgrades. For instance, if a package had the
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following:</p>
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<pre><code>{ "name" : "foo"
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, "config" : { "port" : "8080" } }
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</code></pre><p>and then had a "start" command that then referenced the
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<code>npm_package_config_port</code> environment variable, then the user could
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override that by doing <code>npm config set foo:port 8001</code>.</p>
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<p>See <code><a href="../misc/npm-config.html">npm-config(7)</a></code> and <code><a href="../misc/npm-scripts.html">npm-scripts(7)</a></code> for more on package
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configs.</p>
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<h2 id="dependencies">dependencies</h2>
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<p>Dependencies are specified in a simple object that maps a package name to a
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version range. The version range is a string which has one or more
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space-separated descriptors. Dependencies can also be identified with a
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tarball or git URL.</p>
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<p><strong>Please do not put test harnesses or transpilers in your
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<code>dependencies</code> object.</strong> See <code>devDependencies</code>, below.</p>
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<p>See <a href="../misc/semver.html">semver(7)</a> for more details about specifying version ranges.</p>
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<ul>
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<li><code>version</code> Must match <code>version</code> exactly</li>
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<li><code>>version</code> Must be greater than <code>version</code></li>
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<li><code>>=version</code> etc</li>
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<li><code><version</code></li>
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<li><code><=version</code></li>
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<li><code>~version</code> "Approximately equivalent to version" See <a href="../misc/semver.html">semver(7)</a></li>
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<li><code>^version</code> "Compatible with version" See <a href="../misc/semver.html">semver(7)</a></li>
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<li><code>1.2.x</code> 1.2.0, 1.2.1, etc., but not 1.3.0</li>
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<li><code>http://...</code> See 'URLs as Dependencies' below</li>
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<li><code>*</code> Matches any version</li>
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<li><code>""</code> (just an empty string) Same as <code>*</code></li>
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<li><code>version1 - version2</code> Same as <code>>=version1 <=version2</code>.</li>
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<li><code>range1 || range2</code> Passes if either range1 or range2 are satisfied.</li>
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<li><code>git...</code> See 'Git URLs as Dependencies' below</li>
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<li><code>user/repo</code> See 'GitHub URLs' below</li>
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<li><code>tag</code> A specific version tagged and published as <code>tag</code> See <code><a href="../cli/npm-tag.html">npm-tag(1)</a></code></li>
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<li><code>path/path/path</code> See Local Paths below</li>
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</ul>
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<p>For example, these are all valid:</p>
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<pre><code>{ "dependencies" :
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{ "foo" : "1.0.0 - 2.9999.9999"
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, "bar" : ">=1.0.2 <2.1.2"
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, "baz" : ">1.0.2 <=2.3.4"
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, "boo" : "2.0.1"
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, "qux" : "<1.0.0 || >=2.3.1 <2.4.5 || >=2.5.2 <3.0.0"
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, "asd" : "http://asdf.com/asdf.tar.gz"
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, "til" : "~1.2"
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, "elf" : "~1.2.3"
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, "two" : "2.x"
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, "thr" : "3.3.x"
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, "lat" : "latest"
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, "dyl" : "file:../dyl"
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}
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}
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</code></pre><h3 id="urls-as-dependencies">URLs as Dependencies</h3>
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<p>You may specify a tarball URL in place of a version range.</p>
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<p>This tarball will be downloaded and installed locally to your package at
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install time.</p>
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<h3 id="git-urls-as-dependencies">Git URLs as Dependencies</h3>
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<p>Git urls can be of the form:</p>
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<pre><code>git://github.com/user/project.git#commit-ish
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git+ssh://user@hostname:project.git#commit-ish
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git+ssh://user@hostname/project.git#commit-ish
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git+http://user@hostname/project/blah.git#commit-ish
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git+https://user@hostname/project/blah.git#commit-ish
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</code></pre><p>The <code>commit-ish</code> can be any tag, sha, or branch which can be supplied as
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an argument to <code>git checkout</code>. The default is <code>master</code>.</p>
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<h2 id="github-urls">GitHub URLs</h2>
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<p>As of version 1.1.65, you can refer to GitHub urls as just "foo": "user/foo-project". For example:</p>
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<pre><code>{
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"name": "foo",
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"version": "0.0.0",
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"dependencies": {
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"express": "visionmedia/express"
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}
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}
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</code></pre><h2 id="local-paths">Local Paths</h2>
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<p>As of version 2.0.0 you can provide a path to a local directory that contains a
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package. Local paths can be saved using <code>npm install --save</code>, using any of
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these forms:</p>
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<pre><code>../foo/bar
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~/foo/bar
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./foo/bar
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/foo/bar
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</code></pre><p>in which case they will be normalized to a relative path and added to your
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<code>package.json</code>. For example:</p>
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<pre><code>{
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"name": "baz",
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"dependencies": {
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"bar": "file:../foo/bar"
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}
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}
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</code></pre><p>This feature is helpful for local offline development and creating
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tests that require npm installing where you don't want to hit an
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external server, but should not be used when publishing packages
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to the public registry.</p>
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<h2 id="devdependencies">devDependencies</h2>
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<p>If someone is planning on downloading and using your module in their
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program, then they probably don't want or need to download and build
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the external test or documentation framework that you use.</p>
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<p>In this case, it's best to map these additional items in a <code>devDependencies</code>
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object.</p>
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<p>These things will be installed when doing <code>npm link</code> or <code>npm install</code>
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from the root of a package, and can be managed like any other npm
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configuration param. See <code><a href="../misc/npm-config.html">npm-config(7)</a></code> for more on the topic.</p>
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<p>For build steps that are not platform-specific, such as compiling
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CoffeeScript or other languages to JavaScript, use the <code>prepublish</code>
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script to do this, and make the required package a devDependency.</p>
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<p>For example:</p>
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<pre><code>{ "name": "ethopia-waza",
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"description": "a delightfully fruity coffee varietal",
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"version": "1.2.3",
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"devDependencies": {
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"coffee-script": "~1.6.3"
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},
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"scripts": {
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"prepublish": "coffee -o lib/ -c src/waza.coffee"
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},
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"main": "lib/waza.js"
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}
|
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</code></pre><p>The <code>prepublish</code> script will be run before publishing, so that users
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can consume the functionality without requiring them to compile it
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themselves. In dev mode (ie, locally running <code>npm install</code>), it'll
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run this script as well, so that you can test it easily.</p>
|
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<h2 id="peerdependencies">peerDependencies</h2>
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<p>In some cases, you want to express the compatibility of your package with an
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host tool or library, while not necessarily doing a <code>require</code> of this host.
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This is usually refered to as a <em>plugin</em>. Notably, your module may be exposing
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a specific interface, expected and specified by the host documentation.</p>
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<p>For example:</p>
|
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<pre><code>{
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"name": "tea-latte",
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"version": "1.3.5"
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"peerDependencies": {
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"tea": "2.x"
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}
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}
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</code></pre><p>This ensures your package <code>tea-latte</code> can be installed <em>along</em> with the second
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major version of the host package <code>tea</code> only. The host package is automatically
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installed if needed. <code>npm install tea-latte</code> could possibly yield the following
|
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dependency graph:</p>
|
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<pre><code>├── tea-latte@1.3.5
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└── tea@2.2.0
|
|
</code></pre><p>Trying to install another plugin with a conflicting requirement will cause an
|
|
error. 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="http://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 < 2"</code>.</p>
|
|
<h2 id="bundleddependencies">bundledDependencies</h2>
|
|
<p>Array of package names that will be bundled when publishing the package.</p>
|
|
<p>If this is spelled <code>"bundleDependencies"</code>, then that is also honorable.</p>
|
|
<h2 id="optionaldependencies">optionalDependencies</h2>
|
|
<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.</p>
|
|
<p>It is still your program's responsibility to handle the lack of the
|
|
dependency. For example, something like this:</p>
|
|
<pre><code>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>
|
|
<h2 id="engines">engines</h2>
|
|
<p>You can specify the version of node that your stuff works on:</p>
|
|
<pre><code>{ "engines" : { "node" : ">=0.10.3 <0.12" } }
|
|
</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>If you specify an "engines" field, then npm will require that "node" be
|
|
somewhere on that list. If "engines" is omitted, then npm will just assume
|
|
that it works on node.</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>{ "engines" : { "npm" : "~1.0.20" } }
|
|
</code></pre><p>Note that, unless the user has set the <code>engine-strict</code> config flag, this
|
|
field is advisory only.</p>
|
|
<h2 id="enginestrict">engineStrict</h2>
|
|
<p>If you are sure that your module will <em>definitely not</em> run properly on
|
|
versions of Node/npm other than those specified in the <code>engines</code> object,
|
|
then you can set <code>"engineStrict": true</code> in your package.json file.
|
|
This will override the user's <code>engine-strict</code> config setting.</p>
|
|
<p>Please do not do this unless you are really very very sure. If your
|
|
engines object is something overly restrictive, you can quite easily and
|
|
inadvertently lock yourself into obscurity and prevent your users from
|
|
updating to new versions of Node. Consider this choice carefully. If
|
|
people abuse it, it will be removed in a future version of npm.</p>
|
|
<h2 id="os">os</h2>
|
|
<p>You can specify which operating systems your
|
|
module will run on:</p>
|
|
<pre><code>"os" : [ "darwin", "linux" ]
|
|
</code></pre><p>You can also blacklist instead of whitelist operating systems,
|
|
just prepend the blacklisted os with a '!':</p>
|
|
<pre><code>"os" : [ "!win32" ]
|
|
</code></pre><p>The host operating system is determined by <code>process.platform</code></p>
|
|
<p>It is allowed to both blacklist, and whitelist, although there isn't any
|
|
good reason to do this.</p>
|
|
<h2 id="cpu">cpu</h2>
|
|
<p>If your code only runs on certain cpu architectures,
|
|
you can specify which ones.</p>
|
|
<pre><code>"cpu" : [ "x64", "ia32" ]
|
|
</code></pre><p>Like the <code>os</code> option, you can also blacklist architectures:</p>
|
|
<pre><code>"cpu" : [ "!arm", "!mips" ]
|
|
</code></pre><p>The host architecture is determined by <code>process.arch</code></p>
|
|
<h2 id="preferglobal">preferGlobal</h2>
|
|
<p>If your package is primarily a command-line application that should be
|
|
installed globally, then set this value to <code>true</code> to provide a warning
|
|
if it is installed locally.</p>
|
|
<p>It doesn't actually prevent users from installing it locally, but it
|
|
does help prevent some confusion if it doesn't work as expected.</p>
|
|
<h2 id="private">private</h2>
|
|
<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>
|
|
<h2 id="publishconfig">publishConfig</h2>
|
|
<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 or registry, so that you can
|
|
ensure that a given package is not tagged with "latest" or published to
|
|
the global public registry by default.</p>
|
|
<p>Any config values can be overridden, but of course only "tag" and
|
|
"registry" probably matter for the purposes of publishing.</p>
|
|
<p>See <code><a href="../misc/npm-config.html">npm-config(7)</a></code> to see the list of config options that can be
|
|
overridden.</p>
|
|
<h2 id="default-values">DEFAULT VALUES</h2>
|
|
<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":{"preinstall": "node-gyp rebuild"}</code></p>
|
|
<p>If there is a <code>binding.gyp</code> file in the root of your package, npm will
|
|
default the <code>preinstall</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>
|
|
<h2 id="see-also">SEE ALSO</h2>
|
|
<ul>
|
|
<li><a href="../misc/semver.html">semver(7)</a></li>
|
|
<li><a href="../cli/npm-init.html">npm-init(1)</a></li>
|
|
<li><a href="../cli/npm-version.html">npm-version(1)</a></li>
|
|
<li><a href="../cli/npm-config.html">npm-config(1)</a></li>
|
|
<li><a href="../misc/npm-config.html">npm-config(7)</a></li>
|
|
<li><a href="../cli/npm-help.html">npm-help(1)</a></li>
|
|
<li><a href="../misc/npm-faq.html">npm-faq(7)</a></li>
|
|
<li><a href="../cli/npm-install.html">npm-install(1)</a></li>
|
|
<li><a href="../cli/npm-publish.html">npm-publish(1)</a></li>
|
|
<li><a href="../cli/npm-rm.html">npm-rm(1)</a></li>
|
|
</ul>
|
|
|
|
|