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npm command-line interface
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<section id="content">
<header class="title">
<h1 id="logging">Logging</h1>
<span class="description">Why, What &amp; How We Log</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="#description">Description</a></li><li><a href="#setting-log-file-location">Setting Log File Location</a></li><li><a href="#setting-log-levels">Setting Log Levels</a></li><ul><li><a href="#loglevel"><code>loglevel</code></a></li><ul><li><a href="#aliases">Aliases</a></li></ul><li><a href="#foreground-scripts"><code>foreground-scripts</code></a></li></ul><li><a href="#timing-information">Timing Information</a></li><li><a href="#registry-response-headers">Registry Response Headers</a></li><ul><li><a href="#npm-notice"><code>npm-notice</code></a></li></ul><li><a href="#logs-and-sensitive-information">Logs and Sensitive Information</a></li><li><a href="#see-also">See also</a></li></ul></div>
</section>

<div id="_content"><h3 id="description">Description</h3>
<p>The <code>npm</code> CLI has various mechanisms for showing different levels of information back to end-users for certain commands, configurations &amp; environments.</p>
<h3 id="setting-log-file-location">Setting Log File Location</h3>
<p>All logs are written to a debug log, with the path to that file printed if the execution of a command fails.</p>
<p>The default location of the logs directory is a directory named <code>_logs</code> inside the npm cache. This can be changed
with the <code>logs-dir</code> config option.</p>
<p>Log files will be removed from the <code>logs-dir</code> when the number of log files exceeds <code>logs-max</code>, with the oldest logs being deleted first.</p>
<p>To turn off logs completely set <code>--logs-max=0</code>.</p>
<h3 id="setting-log-levels">Setting Log Levels</h3>
<h4 id="loglevel"><code>loglevel</code></h4>
<p><code>loglevel</code> is a global argument/config that can be set to determine the type of information to be displayed.</p>
<p>The default value of <code>loglevel</code> is <code>"notice"</code> but there are several levels/types of logs available, including:</p>
<ul>
<li><code>"silent"</code></li>
<li><code>"error"</code></li>
<li><code>"warn"</code></li>
<li><code>"notice"</code></li>
<li><code>"http"</code></li>
<li><code>"timing"</code></li>
<li><code>"info"</code></li>
<li><code>"verbose"</code></li>
<li><code>"silly"</code></li>
</ul>
<p>All logs pertaining to a level proceeding the current setting will be shown.</p>
<h5 id="aliases">Aliases</h5>
<p>The log levels listed above have various corresponding aliases, including:</p>
<ul>
<li><code>-d</code>: <code>--loglevel info</code></li>
<li><code>--dd</code>: <code>--loglevel verbose</code></li>
<li><code>--verbose</code>: <code>--loglevel verbose</code></li>
<li><code>--ddd</code>: <code>--loglevel silly</code></li>
<li><code>-q</code>: <code>--loglevel warn</code></li>
<li><code>--quiet</code>: <code>--loglevel warn</code></li>
<li><code>-s</code>: <code>--loglevel silent</code></li>
<li><code>--silent</code>: <code>--loglevel silent</code></li>
</ul>
<h4 id="foreground-scripts"><code>foreground-scripts</code></h4>
<p>The <code>npm</code> CLI began hiding the output of lifecycle scripts for <code>npm install</code> as of <code>v7</code>. Notably, this means you will not see logs/output from packages that may be using "install scripts" to display information back to you or from your own project's scripts defined in <code>package.json</code>. If you'd like to change this behavior &amp; log this output you can set <code>foreground-scripts</code> to <code>true</code>.</p>
<h3 id="timing-information">Timing Information</h3>
<p>The <code>--timing</code> config can be set which does two things:</p>
<ol>
<li>Always shows the full path to the debug log regardless of command exit status</li>
<li>Write timing information to a timing file in the cache or <code>logs-dir</code></li>
</ol>
<p>This file is a newline delimited list of JSON  objects that can be inspected to see timing data for each task in a <code>npm</code> CLI run.</p>
<h3 id="registry-response-headers">Registry Response Headers</h3>
<h4 id="npm-notice"><code>npm-notice</code></h4>
<p>The <code>npm</code> CLI reads from &amp; logs any <code>npm-notice</code> headers that are returned from the configured registry. This mechanism can be used by third-party registries to provide useful information when network-dependent requests occur.</p>
<p>This header is not cached, and will not be logged if the request is served from the cache.</p>
<h3 id="logs-and-sensitive-information">Logs and Sensitive Information</h3>
<p>The <code>npm</code> CLI makes a best effort to redact the following from terminal output and log files:</p>
<ul>
<li>Passwords inside basic auth URLs</li>
<li>npm tokens</li>
</ul>
<p>However, this behavior should not be relied on to keep all possible sensitive information redacted. If you are concerned about secrets in your log file or terminal output, you can use <code>--loglevel=silent</code> and <code>--logs-max=0</code> to ensure no logs are written to your terminal or filesystem.</p>
<h3 id="see-also">See also</h3>
<ul>
<li><a href="../using-npm/config.html">config</a></li>
</ul>
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