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index.html
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13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>npm ci</h1>
<h2 id="install-a-project-with-a-clean-slate" style="position:relative;"><a href="#install-a-project-with-a-clean-slate" aria-label="install a project with a clean slate permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Install a project with a clean slate</h2>
<h3 id="synopsis" style="position:relative;"><a href="#synopsis" aria-label="synopsis permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Synopsis</h3>
<div class="gatsby-highlight" data-language="bash"><pre class="language-bash"><code class="language-bash"><span class="token function">npm</span> ci</code></pre></div>
<h3 id="example" style="position:relative;"><a href="#example" aria-label="example permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Example</h3>
<p>Make sure you have a package-lock and an up-to-date install:</p>
<div class="gatsby-highlight" data-language="bash"><pre class="language-bash"><code class="language-bash">$ <span class="token builtin class-name">cd</span> ./my/npm/project
$ <span class="token function">npm</span> <span class="token function">install</span>
added <span class="token number">154</span> packages <span class="token keyword">in</span> 10s
$ <span class="token function">ls</span> <span class="token operator">|</span> <span class="token function">grep</span> package-lock</code></pre></div>
<p>Run <code class="language-text">npm ci</code> in that project</p>
<div class="gatsby-highlight" data-language="bash"><pre class="language-bash"><code class="language-bash">$ <span class="token function">npm</span> ci
added <span class="token number">154</span> packages <span class="token keyword">in</span> 5s</code></pre></div>
<p>Configure Travis to build using <code class="language-text">npm ci</code> instead of <code class="language-text">npm install</code>:</p>
<div class="gatsby-highlight" data-language="bash"><pre class="language-bash"><code class="language-bash"><span class="token comment"># .travis.yml</span>
install:
- <span class="token function">npm</span> ci
<span class="token comment"># keep the npm cache around to speed up installs</span>
cache:
directories:
- <span class="token string">"<span class="token environment constant">$HOME</span>/.npm"</span></code></pre></div>
<h3 id="description" style="position:relative;"><a href="#description" aria-label="description permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Description</h3>
<p>This command is similar to <a href="../../cli-commands/install"><code class="language-text">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 class="language-text">npm install</code> and <code class="language-text">npm ci</code> are:</p>
<ul>
<li>The project <strong>must</strong> have an existing <code class="language-text">package-lock.json</code> or <code class="language-text">npm-shrinkwrap.json</code>.</li>
<li>If dependencies in the package lock do not match those in <code class="language-text">package.json</code>, <code class="language-text">npm ci</code> will exit with an error, instead of updating the package lock.</li>
<li><code class="language-text">npm ci</code> can only install entire projects at a time: individual dependencies cannot be added with this command.</li>
<li>If a <code class="language-text">node_modules</code> is already present, it will be automatically removed before <code class="language-text">npm ci</code> begins its install.</li>
<li>It will never write to <code class="language-text">package.json</code> or any of the package-locks: installs are essentially frozen.</li>
</ul>
<h3 id="see-also" style="position:relative;"><a href="#see-also" aria-label="see also permalink" class="header-link-class before"><svg aria-hidden="true" height="20" version="1.1" viewBox="0 0 16 16" width="20"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>See Also</h3>
<ul>
<li><a href="../../cli-commands/install">npm install</a></li>
<li><a href="../../configuring-npm/package-locks">package-locks</a></li>
</ul></div><div class="FoundTypo__Container-sc-1e373sc-0 fMOzaj"><p><span role="img" aria-label="eyes-emoji">👀</span> Found a typo? <a href="https://github.com/npm/cli/">Let us know!</a></p><p>The current stable version of npm is <a href="https://github.com/npm/cli/">here</a>. To upgrade, run: <code class="language-text">npm install npm@latest -g</code></p><p>To report bugs or submit feature requests for the docs, or for any issues regarding the npm command line tool, please post <a href="https://github.com/npm/cli/issues">on the npm/cli GitHub project</a>.</p></div><script>
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