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id="npm-doctor1" style="position:relative;"><a href="#npm-doctor1" aria-label="npm doctor1 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>npm doctor</h1>
<h2 id="check-your-environments" style="position:relative;"><a href="#check-your-environments" aria-label="check your environments 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>Check your environments</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> doctor</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><code class="language-text">npm doctor</code> runs a set of checks to ensure that your npm installation has
what it needs to manage your JavaScript packages. npm is mostly a standalone tool, but it does
have some basic requirements that must be met:</p>
<ul>
<li>Node.js and git must be executable by npm.</li>
<li>The primary npm registry, <code class="language-text">registry.npmjs.com</code>, or another service that uses
the registry API, is available.</li>
<li>The directories that npm uses, <code class="language-text">node_modules</code> (both locally and globally),
exist and can be written by the current user.</li>
<li>The npm cache exists, and the package tarballs within it aren't corrupt.</li>
</ul>
<p>Without all of these working properly, npm may not work properly.  Many issues
are often attributable to things that are outside npm's code base, so <code class="language-text">npm
doctor</code> confirms that the npm installation is in a good state.</p>
<p>Also, in addition to this, there are also very many issue reports due to using
old versions of npm. Since npm is constantly improving, running <code class="language-text">npm@latest</code> is
better than an old version.</p>
<p><code class="language-text">npm doctor</code> verifies the following items in your environment, and if there are
any recommended changes, it will display them.</p>
<h4 id="npm-ping" style="position:relative;"><a href="#npm-ping" aria-label="npm ping 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><code class="language-text">npm ping</code></h4>
<p>By default, npm installs from the primary npm registry, <code class="language-text">registry.npmjs.org</code>.
<code class="language-text">npm doctor</code> hits a special ping endpoint within the registry. This can also be
checked with <code class="language-text">npm ping</code>. If this check fails, you may be using a proxy that
needs to be configured, or may need to talk to your IT staff to get access over
HTTPS to <code class="language-text">registry.npmjs.org</code>.</p>
<p>This check is done against whichever registry you've configured (you can see
what that is by running <code class="language-text">npm config get registry</code>), and if you're using a
private registry that doesn't support the <code class="language-text">/whoami</code> endpoint supported by the
primary registry, this check may fail.</p>
<h4 id="npm--v" style="position:relative;"><a href="#npm--v" aria-label="npm  v 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><code class="language-text">npm -v</code></h4>
<p>While Node.js may come bundled with a particular version of npm, it's the
policy of the CLI team that we recommend all users run <code class="language-text">npm@latest</code> if they
can. As the CLI is maintained by a small team of contributors, there are only
resources for a single line of development, so npm's own long-term support
releases typically only receive critical security and regression fixes. The
team believes that the latest tested version of npm is almost always likely to
be the most functional and defect-free version of npm.</p>
<h4 id="node--v" style="position:relative;"><a href="#node--v" aria-label="node  v 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><code class="language-text">node -v</code></h4>
<p>For most users, in most circumstances, the best version of Node will be the
latest long-term support (LTS) release. Those of you who want access to new
ECMAscript features or bleeding-edge changes to Node's standard library may be
running a newer version, and some of you may be required to run an older
version of Node because of enterprise change control policies. That's OK! But
in general, the npm team recommends that most users run Node.js LTS.</p>
<h4 id="npm-config-get-registry" style="position:relative;"><a href="#npm-config-get-registry" aria-label="npm config get registry 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><code class="language-text">npm config get registry</code></h4>
<p>Some of you may be installing from private package registries for your project
or company. That's great! Others of you may be following tutorials or
StackOverflow questions in an effort to troubleshoot problems you may be
having. Sometimes, this may entail changing the registry you're pointing at.
This part of <code class="language-text">npm doctor</code> just lets you, and maybe whoever's helping you with
support, know that you're not using the default registry.</p>
<h4 id="which-git" style="position:relative;"><a href="#which-git" aria-label="which git 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><code class="language-text">which git</code></h4>
<p>While it's documented in the README, it may not be obvious that npm needs Git
installed to do many of the things that it does. Also, in some cases
– especially on Windows – you may have Git set up in such a way that it's not
accessible via your <code class="language-text">PATH</code> so that npm can find it. This check ensures that Git
is available.</p>
<h4 id="permissions-checks" style="position:relative;"><a href="#permissions-checks" aria-label="permissions checks 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>Permissions checks</h4>
<ul>
<li>Your cache must be readable and writable by the user running npm.</li>
<li>Global package binaries must be writable by the user running npm.</li>
<li>Your local <code class="language-text">node_modules</code> path, if you're running <code class="language-text">npm doctor</code> with a project
directory, must be readable and writable by the user running npm.</li>
</ul>
<h4 id="validate-the-checksums-of-cached-packages" style="position:relative;"><a href="#validate-the-checksums-of-cached-packages" aria-label="validate the checksums of cached packages 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>Validate the checksums of cached packages</h4>
<p>When an npm package is published, the publishing process generates a checksum
that npm uses at install time to verify that the package didn't get corrupted
in transit. <code class="language-text">npm doctor</code> uses these checksums to validate the package tarballs
in your local cache (you can see where that cache is located with <code class="language-text">npm config
get cache</code>, and see what's in that cache with <code class="language-text">npm cache ls</code> – probably more
than you were expecting!). In the event that there are corrupt packages in your
cache, you should probably run <code class="language-text">npm cache clean</code> and reset the cache.</p>
<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/npm-bugs">npm bugs</a></li>
<li><a href="../../cli-commands/npm-help">npm help</a></li>
<li><a href="../../cli-commands/npm-ping">npm ping</a></li>
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