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# Highlight.js [](https://www.npmjs.com/package/highlight.js) [](https://join.slack.com/t/highlightjs/shared_invite/zt-mj0utgqp-TNFf4VQICnDnPg4zMHChFw) [](https://discord.gg/M24EbU7ja9) [](https://github.com/highlightjs/highlight.js/blob/main/LICENSE) [](https://packagephobia.now.sh/result?p=highlight.js)  [](https://www.npmjs.com/package/highlight.js) [](https://www.jsdelivr.com/package/gh/highlightjs/cdn-release)  [](https://lgtm.com/projects/g/highlightjs/highlight.js/?mode=list) [](https://github.com/highlightjs/highlight.js/actions?query=workflow%3A%22Node.js+CI%22) [](https://github.com/highlightjs/highlight.js/issues) [](https://github.com/highlightjs/highlight.js/issues?q=is%3Aopen+is%3Aissue+label%3A%22help+welcome%22) [](https://github.com/highlightjs/highlight.js/issues?q=is%3Aopen+is%3Aissue+label%3A%22beginner+friendly%22) [](https://snyk.io/test/github/highlightjs/highlight.js?targetFile=package.json) <!-- [](https://github.com/highlightjs/highlight.js/actions?query=workflow%3A%22Node.js+CI%22) --> <!-- [](https://github.com/highlightjs/highlight.js/commits/main) --> <!-- [](https://www.jsdelivr.com/package/gh/highlightjs/cdn-release) --> <!-- []() --> <!-- [](https://bundlephobia.com/result?p=highlight.js) --> Highlight.js is a syntax highlighter written in JavaScript. It works in the browser as well as on the server. It works with pretty much any markup, doesn’t depend on any framework, and has automatic language detection. #### Upgrading to Version 10 Version 10 is one of the biggest releases in quite some time. If you're upgrading from version 9, there are some breaking changes and things you may want to double check first. Please read [VERSION_10_UPGRADE.md](https://github.com/highlightjs/highlight.js/blob/main/VERSION_10_UPGRADE.md) for high-level summary of breaking changes and any actions you may need to take. See [VERSION_10_BREAKING_CHANGES.md](https://github.com/highlightjs/highlight.js/blob/main/VERSION_10_BREAKING_CHANGES.md) for a more detailed list and [CHANGES.md](https://github.com/highlightjs/highlight.js/blob/main/CHANGES.md) to learn what else is new. ##### Support for older versions Please see [SECURITY.md](https://github.com/highlightjs/highlight.js/blob/main/SECURITY.md) for support information. ## Getting Started The bare minimum for using highlight.js on a web page is linking to the library along with one of the styles and calling [`highlightAll`][1]: ```html <link rel="stylesheet" href="/path/to/styles/default.css"> <script src="/path/to/highlight.min.js"></script> <script>hljs.highlightAll();</script> ``` This will find and highlight code inside of `<pre><code>` tags; it tries to detect the language automatically. If automatic detection doesn’t work for you, you can specify the language in the `class` attribute: ```html <pre><code class="html">...</code></pre> ``` Classes may also be prefixed with either `language-` or `lang-`. ```html <pre><code class="language-html">...</code></pre> ``` ### Plaintext and Disabling Highlighting To style arbitrary text like code, but without any highlighting, use the `plaintext` class: ```html <pre><code class="plaintext">...</code></pre> ``` To disable highlighting of a tag completely, use the `nohighlight` class: ```html <pre><code class="nohighlight">...</code></pre> ``` ### Supported Languages Highlight.js supports over 180 different languages in the core library. There are also 3rd party language plugins available for additional languages. You can find the full list of supported languages in [SUPPORTED_LANGUAGES.md][9]. ## Custom Scenarios When you need a bit more control over the initialization of highlight.js, you can use the [`highlightBlock`][3] and [`configure`][4] functions. This allows you to better control *what* to highlight and *when*. Here’s the equivalent of calling [`highlightAll`][1] using only vanilla JS: ```js document.addEventListener('DOMContentLoaded', (event) => { document.querySelectorAll('pre code').forEach((block) => { hljs.highlightBlock(block); }); }); ``` Please refer to the documentation for [`configure`][4] options. ### Using custom HTML elements for code blocks We strongly recommend `<pre><code>` wrapping for code blocks. It's quite semantic and "just works" out of the box with zero fiddling. It is possible to use other HTML elements (or combos), but you may need to pay special attention to preserving linebreaks. Let's say your markup for code blocks uses divs: ```html <div class='code'>...</div> ``` To highlight such blocks manually: ```js // first, find all the div.code blocks document.querySelectorAll('div.code').forEach(block => { // then highlight each hljs.highlightBlock(block); }); ``` Without using a tag that preserves linebreaks (like `pre`) you'll need some additional CSS to help preserve them. You could also [pre and post-process line breaks with a plug-in][brPlugin], but *we recommend using CSS*. [brPlugin]: https://github.com/highlightjs/highlight.js/issues/2559 To preserve linebreaks inside a `div` using CSS: ```css div.code { white-space: pre; } ``` ## Using with Vue.js Simply register the plugin with Vue: ```js Vue.use(hljs.vuePlugin); ``` And you'll be provided with a `highlightjs` component for use in your templates: ```html <div id="app"> <!-- bind to a data property named `code` --> <highlightjs autodetect :code="code" /> <!-- or literal code works as well --> <highlightjs language='javascript' code="var x = 5;" /> </div> ``` ## Web Workers You can run highlighting inside a web worker to avoid freezing the browser window while dealing with very big chunks of code. In your main script: ```js addEventListener('load', () => { const code = document.querySelector('#code'); const worker = new Worker('worker.js'); worker.onmessage = (event) => { code.innerHTML = event.data; } worker.postMessage(code.textContent); }); ``` In worker.js: ```js onmessage = (event) => { importScripts('<path>/highlight.min.js'); const result = self.hljs.highlightAuto(event.data); postMessage(result.value); }; ``` ## Node.js You can use highlight.js with n