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<!DOCTYPE html>
<html lang="en">
<head>
<title>CodeQL documentation</title>
<meta name="viewport" content="width=device-width, initial-scale=1" />
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<span class="hide-sm">CodeQL documentation</span>
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CodeQL resources
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<li><a class="dropdown-item" href="codeql-overview">CodeQL overview</a></li>
<li class="dropdown-divider" role="separator"></li>
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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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Reference docs
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Source files
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<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>
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<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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<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
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</div>
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<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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