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npm command-line interface
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<h1 id="----npm-explain----1094">
<span>npm-explain</span>
<span class="version">@10.9.4</span>
</h1>
<span class="description">Explain installed packages</span>
</header>
<section id="table_of_contents">
<h2 id="table-of-contents">Table of contents</h2>
<div id="_table_of_contents"><ul><li><a href="#synopsis">Synopsis</a></li><li><a href="#description">Description</a></li><li><a href="#configuration">Configuration</a></li><ul><li><a href="#json"><code>json</code></a></li><li><a href="#workspace"><code>workspace</code></a></li></ul><li><a href="#see-also">See Also</a></li></ul></div>
</section>
<div id="_content"><h3 id="synopsis">Synopsis</h3>
<pre><code class="language-bash">npm explain <package-spec>
alias: why
</code></pre>
<h3 id="description">Description</h3>
<p>This command will print the chain of dependencies causing a given package
to be installed in the current project.</p>
<p>If one or more package specs are provided, then only packages matching
one of the specifiers will have their relationships explained.</p>
<p>The package spec can also refer to a folder within <code>./node_modules</code></p>
<p>For example, running <code>npm explain glob</code> within npm's source tree will show:</p>
<pre><code class="language-bash">glob@7.1.6
node_modules/glob
glob@"^7.1.4" from the root project
glob@7.1.1 dev
node_modules/tacks/node_modules/glob
glob@"^7.0.5" from rimraf@2.6.2
node_modules/tacks/node_modules/rimraf
rimraf@"^2.6.2" from tacks@1.3.0
node_modules/tacks
dev tacks@"^1.3.0" from the root project
</code></pre>
<p>To explain just the package residing at a specific folder, pass that as the
argument to the command. This can be useful when trying to figure out
exactly why a given dependency is being duplicated to satisfy conflicting
version requirements within the project.</p>
<pre><code class="language-bash">$ npm explain node_modules/nyc/node_modules/find-up
find-up@3.0.0 dev
node_modules/nyc/node_modules/find-up
find-up@"^3.0.0" from nyc@14.1.1
node_modules/nyc
nyc@"^14.1.1" from tap@14.10.8
node_modules/tap
dev tap@"^14.10.8" from the root project
</code></pre>
<h3 id="configuration">Configuration</h3>
<h4 id="json"><code>json</code></h4>
<ul>
<li>Default: false</li>
<li>Type: Boolean</li>
</ul>
<p>Whether or not to output JSON data, rather than the normal output.</p>
<ul>
<li>In <code>npm pkg set</code> it enables parsing set values with JSON.parse() before
saving them to your <code>package.json</code>.</li>
</ul>
<p>Not supported by all npm commands.</p>
<h4 id="workspace"><code>workspace</code></h4>
<ul>
<li>Default:</li>
<li>Type: String (can be set multiple times)</li>
</ul>
<p>Enable running a command in the context of the configured workspaces of the
current project while filtering by running only the workspaces defined by
this configuration option.</p>
<p>Valid values for the <code>workspace</code> config are either:</p>
<ul>
<li>Workspace names</li>
<li>Path to a workspace directory</li>
<li>Path to a parent workspace directory (will result in selecting all
workspaces within that folder)</li>
</ul>
<p>When set for the <code>npm init</code> command, this may be set to the folder of a
workspace which does not yet exist, to create the folder and set it up as a
brand new workspace within the project.</p>
<p>This value is not exported to the environment for child processes.</p>
<h3 id="see-also">See Also</h3>
<ul>
<li><a href="../using-npm/package-spec.html">package spec</a></li>
<li><a href="../commands/npm-config.html">npm config</a></li>
<li><a href="../configuring-npm/npmrc.html">npmrc</a></li>
<li><a href="../configuring-npm/folders.html">npm folders</a></li>
<li><a href="../commands/npm-ls.html">npm ls</a></li>
<li><a href="../commands/npm-install.html">npm install</a></li>
<li><a href="../commands/npm-link.html">npm link</a></li>
<li><a href="../commands/npm-prune.html">npm prune</a></li>
<li><a href="../commands/npm-outdated.html">npm outdated</a></li>
<li><a href="../commands/npm-update.html">npm update</a></li>
</ul></div>
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