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<!DOCTYPE html>
<html lang="en">
<head>
<title>CodeQL documentation</title>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link rel="stylesheet" href="_static/primer.css" />
<link rel="shortcut icon" href="_static/favicon.ico"/>
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<body>
<div class="Header">
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<span class="hide-sm">CodeQL documentation</span>
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CodeQL resources
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</summary>
<ul class="dropdown-menu dropdown-menu-se dropdown-menu-dark">
<li><a class="dropdown-item" href="codeql-overview">CodeQL overview</a></li>
<li class="dropdown-divider" role="separator"></li>
<div class="dropdown-header">
CodeQL tools
</div>
<li><a class="dropdown-item" href="codeql-for-visual-studio-code">CodeQL for VS Code</a>
<li><a class="dropdown-item" href="codeql-cli">CodeQL CLI</a>
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CodeQL guides
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<li><a class="dropdown-item" href="writing-codeql-queries">Writing CodeQL queries</a></li>
<li><a class="dropdown-item" href="codeql-language-guides">CodeQL language guides</a>
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Reference docs
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<li><a class="dropdown-item" href="ql-language-reference/">QL language
reference</a>
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standard-libraries</a>
<li><a class="dropdown-item" href="../codeql-query-help">CodeQL
query help</a>
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Source files
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<li><a class="dropdown-item" href="https://github.com/github/codeql">CodeQL repository</a>
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</details>
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</div>
<article class="pb-6" style="min-height: calc(100vh - 68px);">
<div class="blankslate">
<img src="https://ghicons.github.com/assets/images/blue/svg/Code%20QL.svg" class="mb-3" />
<h1>CodeQL documentation</h1>
<p class="f2">Discover vulnerabilities across a codebase with CodeQL, our industry-leading semantic code
analysis
engine. CodeQL lets you query code as though it were data. Write a query to find all variants of a
vulnerability, eradicating it forever. Then share your query to help others do the same.</p>
</div>
<div class="d-flex flex-column flex-md-row flex-justify-center">
<div class="Box col-lg-5 col-sm-12 border-0">
<div class="Box-header border-0 bg-white">
<h3 class="Box-title text-mono f3 text-center">
BACKGROUND INFORMATION
</h3>
</div>
<div class="Box-body border-bottom-0">
<div class="Subhead border-0">
<a href="codeql-overview/about-codeql">
<div class="Subhead-heading f4 text-center">About CodeQL</div>
</a>
<div class="Subhead-description">Learn more about how CodeQL works...</div>
</div>
<div class="Subhead border-0">
<a href="codeql-overview/supported-languages-and-frameworks/">
<div class="Subhead-heading f4 text-center">Supported languages and frameworks</div>
</a>
<div class="Subhead-description">View the languages, libraries, and frameworks supported in the
latest version of CodeQL...</div>
</div>
<div class="Subhead border-0">
<a href="../publications">
<div class="Subhead-heading f4 text-center">Academic publications</div>
</a>
<div class="Subhead-description">Read academic articles published by the team behind CodeQL...
</div>
</div>
</div>
</div>
<div class="Box col-lg-5 col-sm-12 border-0">
<div class="Box-header border-0 bg-white">
<h3 class="Box-title text-mono f3 text-center">
CODEQL TOOLS
</h3>
</div>
<div class="Box-body border-bottom-0">
<div class="Subhead border-0">
<a href="codeql-cli">
<div class="Subhead-heading f4 text-center">CodeQL CLI</div>
</a>
<div class="Subhead-description border-bottom-0">The CodeQL command-line interface (CLI) is used
to create
databases for security research....</div>
</div>
<div class="Subhead border-0">
<a href="codeql-for-visual-studio-code">
<div class="Subhead-heading f4 text-center">CodeQL for Visual Studio Code</div>
</a>
<div class="Subhead-description">CodeQL for Visual Studio Code adds rich language
support for CodeQL...</div>
</div>
<div class="Subhead border-0">
<a
href="https://docs.github.com/en/github/finding-security-vulnerabilities-and-errors-in-your-code/about-code-scanning">
<div class="Subhead-heading f4 text-center">Code scanning with CodeQL</div>
</a>
<div class="Subhead-description">Use code scanning with CodeQL to analyze the code in a GitHub
repository to find
security
vulnerabilities...</div>
</div>
</div>
</div>
</div>
</div>
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<div class="Box col-lg-5 col-sm-12 border-0">
<div class="Box-header border-0 bg-white">
<h3 class="Box-title text-mono f3 text-center">
CODEQL GUIDES
</h3>
</div>
<div class="Box-body border-bottom-0">
<div class="Subhead border-0">
<a href="writing-codeql-queries">
<div class="Subhead-heading f4 text-center">Writing CodeQL queries</div>
</a>
<div class="Subhead-description">Get to know more about queries and learn some key
query-writing skills by solving puzzles.....</div>
</div>
<div class="Subhead border-0">
<a href="codeql-language-guides">
<div class="Subhead-heading f4 text-center">CodeQL language guides</div>
</a>
<div class="Subhead-description">Experiment and learn how to write effective and efficient
queries for CodeQL databases generated from the languages supported in CodeQL
analysis...</div>
</div>
</div>
</div>
<div class="Box col-lg-5 col-sm-12 border-0">
<div class="Box-header border-0 bg-white">
<h3 class="Box-title text-mono f3 text-center">
CODEQL REFERENCE DOCS
</h3>
</div>
<div class="Box-body border-bottom-0">
<div class="Subhead border-0">
<div class="Subhead border-0">
<a href="ql-language-reference">
<div class="Subhead-heading f4 text-center">QL language reference</div>
</a>
<div class="Subhead-description">Learn all about QL, the powerful query language that
underlies the code scanning tool CodeQL...
</div>
</div>
<a href="../codeql-standard-libraries">
<div class="Subhead-heading f4 text-center">CodeQL standard libraries</div>
</a>
<div class="Subhead-description">Find details of the predicates, modules, and classes
included with CodeQL...</div>
</div>
<div class="Subhead border-0">
<a href="../codeql-query-help">
<div class="Subhead-heading f4 text-center">CodeQL query help</div>
</a>
<div class="Subhead-description">View the query help for the queries included in the code
scanning query suites...</div>
</div>
</div>
</div>
</div>
</article>
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 19 18" class="d-block" height="18">
<path
d="M3.94 2A2 2 0 1 1 2 0a2 2 0 0 1 1.94 2zM4 5.48H0V18h4zm6.32 0H6.34V18h3.94v-6.57c0-3.66 4.77-4 4.77 0V18H19v-7.93c0-6.17-7.06-5.94-8.72-2.91z"
fill="currentColor"></path>
</svg>
</a>
</li>
<li>
<a href="https://github.com/github" title="GitHub's organization" style="color: #959da5;">
<svg version="1.1" width="20" height="20" viewBox="0 0 16 16"
class="octicon octicon-mark-github" aria-hidden="true">
<path fill-rule="evenodd"
d="M8 0C3.58 0 0 3.58 0 8c0 3.54 2.29 6.53 5.47 7.59.4.07.55-.17.55-.38 0-.19-.01-.82-.01-1.49-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01 1.08.58 1.23.82.72 1.21 1.87.87 2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95 0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21 2.2.82.64-.18 1.32-.27 2-.27.68 0 1.36.09 2 .27 1.53-1.04 2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82 2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48 0 1.07-.01 1.93-.01 2.2 0 .21.15.46.55.38A8.013 8.013 0 0016 8c0-4.42-3.58-8-8-8z">
</path>
</svg>
</a>
</li>
</ul>
<ul class="list-style-none d-flex text-gray">
<li class="mr-3">©
<script type="text/javascript">document.write(new Date().getFullYear());</script> GitHub, Inc.</li>
<li class="mr-3"><a
href="https://docs.github.com/github/site-policy/github-terms-of-service"
class="link-gray">Terms </a></li>
<li><a href="https://docs.github.com/github/site-policy/github-privacy-statement"
class="link-gray">Privacy </a></li>
</ul>
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