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bNiGAM">Run arbitrary package scripts</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../cli-commands/npm-search">npm search<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Search for packages</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../cli-commands/npm-shrinkwrap">npm shrinkwrap<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Lock down dependency versions for publication</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../cli-commands/npm-star">npm star<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Mark your favorite packages</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../cli-commands/npm-stars">npm stars<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">View packages marked as favorites</span></a></div><div class="css-l3rx45"><a 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href="../../cli-commands/npm-view">npm view<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">View registry info</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../cli-commands/npm-whoami">npm whoami<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Display npm username</span></a></div></div></div><div><button class="Accordion__SectionButton-i8yhwx-0 dsecBh">configuring-npm</button><div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../configuring-npm/folders">folders<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Folder Structures Used by npm</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../configuring-npm/install">install<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Download and install node and npm</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../configuring-npm/npmrc">npmrc<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">The npm config files</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../configuring-npm/package-lock-json">package-lock.json<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">A manifestation of the manifest</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../configuring-npm/package-locks">package-locks<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">An explanation of npm lockfiles</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../configuring-npm/package-json">package.json<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Specifics of npm's package.json handling</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../configuring-npm/shrinkwrap-json">shrinkwrap.json<span 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bNiGAM">Working with Teams & Orgs</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../using-npm/registry">registry<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">The JavaScript Package Registry</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../using-npm/removal">removal<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Cleaning the Slate</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../using-npm/scope">scope<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">Scoped packages</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../using-npm/scripts">scripts<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">How npm handles the "scripts" field</span></a></div><div class="css-l3rx45"><a class="links__SidebarLink-sc-19vgq0o-3 iPgskl" href="../../using-npm/semver">semver<span class="DocLinks__LinkDesc-sc-1vrw6od-0 bNiGAM">The semantic versioner for npm</span></a></div></div></div></nav><style data-emotion-css="16vu25q">.css-16vu25q{box-sizing:border-box;margin:0;min-width:0;width:100%;}</style><div class="css-16vu25q"><div class="Page__Content-sc-4b62ym-0 gJQTGP documentation"><div><h1 id="npm-dedupe1" style="position:relative;"><a href="#npm-dedupe1" aria-label="npm dedupe1 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 dedupe</h1>
<h2 id="reduce-duplication" style="position:relative;"><a href="#reduce-duplication" aria-label="reduce duplication 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>Reduce duplication</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> dedupe
<span class="token function">npm</span> ddp
aliases: find-dupes, ddp</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>Searches the local package tree and attempts to simplify the overall
structure by moving dependencies further up the tree, where they can
be more effectively shared by multiple dependent packages.</p>
<p>For example, consider this dependency graph:</p>
<div class="gatsby-highlight" data-language="bash"><pre class="language-bash"><code class="language-bash">a
+-- b <span class="token operator"><</span>-- depends on c@1.0.x
<span class="token operator">|</span> <span class="token variable"><span class="token variable">`</span>-- c@1.0.3
<span class="token variable">`</span></span>-- d <span class="token operator"><</span>-- depends on c@~1.0.9
`-- c@1.0.10</code></pre></div>
<p>In this case, <code class="language-text">npm dedupe</code> will transform the tree to:</p>
<div class="gatsby-highlight" data-language="bash"><pre class="language-bash"><code class="language-bash">a
+-- b
+-- d
`-- c@1.0.10</code></pre></div>
<p>Because of the hierarchical nature of node's module lookup, b and d
will both get their dependency met by the single c package at the root
level of the tree.</p>
<p>The deduplication algorithm walks the tree, moving each dependency as far
up in the tree as possible, even if duplicates are not found. This will
result in both a flat and deduplicated tree.</p>
<p>If a suitable version exists at the target location in the tree
already, then it will be left untouched, but the other duplicates will
be deleted.</p>
<p>Arguments are ignored. Dedupe always acts on the entire tree.</p>
<p>Modules</p>
<p>Note that this operation transforms the dependency tree, but will never
result in new modules being installed.</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-ls">npm ls</a></li>
<li><a href="../../cli-commands/npm-update">npm update</a></li>
<li><a href="../../cli-commands/npm-install">npm install</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, please post <a href="https://npm.community/c/support/docs-needed">here</a>. Submit npm issues <a href="https://npm.community/c/bugs">here.</a></p></div><script>
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