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npm command-line interface
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<header class="title">
<h1 id="npm-ci">npm-ci</h1>
<span class="description">Install a project with a clean slate</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="#example">Example</a></li><li><a href="#description">Description</a></li><li><a href="#see-also">See Also</a></li></ul></div>
</section>
<div id="_content"><h3 id="synopsis">Synopsis</h3>
<pre lang="bash"><code>npm ci
</code></pre>
<h3 id="example">Example</h3>
<p>Make sure you have a package-lock and an up-to-date install:</p>
<pre lang="bash"><code>$ cd ./my/npm/project
$ npm install
added 154 packages in 10s
$ ls | grep package-lock
</code></pre>
<p>Run <code>npm ci</code> in that project</p>
<pre lang="bash"><code>$ npm ci
added 154 packages in 5s
</code></pre>
<p>Configure Travis to build using <code>npm ci</code> instead of <code>npm install</code>:</p>
<pre lang="bash"><code># .travis.yml
install:
- npm ci
# keep the npm cache around to speed up installs
cache:
directories:
- "$HOME/.npm"
</code></pre>
<h3 id="description">Description</h3>
<p>This command is similar to <a href="../commands/npm-install.html"><code>npm install</code></a>, except it’s meant to be used in
automated environments such as test platforms, continuous integration, and
deployment – or any situation where you want to make sure you’re doing a clean
install of your dependencies. It can be significantly faster than a regular npm
install by skipping certain user-oriented features. It is also more strict than
a regular install, which can help catch errors or inconsistencies caused by the
incrementally-installed local environments of most npm users.</p>
<p>In short, the main differences between using <code>npm install</code> and <code>npm ci</code> are:</p>
<ul>
<li>The project <strong>must</strong> have an existing <code>package-lock.json</code> or <code>npm-shrinkwrap.json</code>.</li>
<li>If dependencies in the package lock do not match those in <code>package.json</code>, <code>npm ci</code> will exit with an error, instead of updating the package lock.</li>
<li><code>npm ci</code> can only install entire projects at a time: individual dependencies cannot be added with this command.</li>
<li>If a <code>node_modules</code> is already present, it will be automatically removed before <code>npm ci</code> begins its install.</li>
<li>It will never write to <code>package.json</code> or any of the package-locks: installs are essentially frozen.</li>
</ul>
<h3 id="see-also">See Also</h3>
<ul>
<li><a href="../commands/npm-install.html">npm install</a></li>
<li><a href="../configuring-npm/package-locks.html">package-locks</a></li>
</ul>
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