A JavaScript syntax highlighter with automatic language detection and zero dependencies for both browser and server environments.
Highlight.js is a JavaScript library that adds syntax highlighting to code snippets displayed on web pages or in applications. It automatically detects the programming language and applies appropriate coloring to keywords, strings, comments, and other syntax elements, making code more readable. It solves the problem of manually styling code or relying on heavy editor-based highlighters for web content.
Web developers, technical writers, and anyone building applications that need to display code snippets with proper syntax highlighting, such as documentation sites, blogs, forums, or code editors.
Developers choose Highlight.js for its zero dependencies, automatic language detection, and broad language support, allowing easy integration without configuration overhead. Its ability to run both client-side and server-side provides flexibility unmatched by many alternatives.
JavaScript syntax highlighter with language auto-detection and zero dependencies.
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Supports over 180 languages with automatic detection, covering a wide range of programming and markup languages out of the box, as listed in SUPPORTED_LANGUAGES.md.
A standalone library that doesn't rely on any external frameworks, ensuring easy integration and reduced risk of dependency conflicts, highlighted in the README as a key feature.
Works identically in both browser and Node.js environments, allowing seamless server-side rendering or client-side highlighting without code changes.
Can be used with any HTML markup and offers APIs for custom initialization, web worker usage, and manual highlighting, as detailed in the Custom Usage section.
Even with selective loading, the common subset includes many languages, which can unnecessarily increase bundle size for applications only needing a few languages, and the README warns against linking directly to GitHub for performance reasons.
Automatic detection isn't always accurate, especially for short or mixed-language code snippets, requiring manual specification via class attributes, which can lead to errors if not managed carefully.
When using non-standard HTML elements instead of <pre><code>, additional CSS or processing is needed to preserve linebreaks, as admitted in the README, adding overhead for simple integrations.