KaTeX Plugin for MarkdownIt

Add Math to your Markdown.

This package a fork of @neilsustc/markdown-it-katex.

KaTeX is a faster alternative to MathJax. This plugin makes it easy to support in your markdown.

Usage

Install markdown-it and this plugin:

npm install markdown-it katex @renbaoshuo/markdown-it-katex

Then use it in your javascript:

const MarkdownIt = require('markdown-it');

const md = new MarkdownIt();
md.use(require('@renbaoshuo/markdown-it-katex'));

// double backslash is required for javascript strings, but not html input
const result = md.render('# Math\n\n$\\sqrt{3x - 1} + (1 + x)^2$\n');

Include the KaTeX stylesheet in your html:

<link
  rel="stylesheet"
  href="https://cdn.jsdelivr.net/npm/katex/dist/katex.min.css"
/>

KaTeX options can be supplied with the second argument to use.

md.use(mk, { throwOnError: false, errorColor: '#cc0000' });

Examples

Inline

Surround your LaTeX with a single $ on each side for inline rendering.

$\sqrt{3x - 1} + (1 + x)^2$

Block

Use two ($$) for block rendering. This mode uses bigger symbols and centers the result.

$$
\begin{aligned}
d & = ax + by \\
  & = by + (a \bmod b)x \\
  & = by + (a - \lfloor \frac{a}{b} \rfloor b )x \\
  & = ax + b(y - \lfloor \frac{a}{b} \rfloor x)
\end{aligned}
$$

Syntax

Math parsing in markdown is designed to agree with the conventions set by pandoc:

Anything between two $ characters will be treated as TeX math. The opening $ must have a non-space character immediately to its right, while the closing $ must have a non-space character immediately to its left, and must not be followed immediately by a digit. Thus, $20,000 and $30,000 won’t parse as math. If for some reason you need to enclose text in literal $ characters, backslash-escape them and they won’t be treated as math delimiters.

If you do not follow the above behavior, pass the skipDelimitersCheck option as true.

Math Syntax Support

KaTeX is based on TeX and LaTeX. Support for both is growing. Here's a list of currently supported functions: Function Support in KaTeX.

Author

@renbaoshuo/markdown-it-katex © Baoshuo, Released under the MIT License. Authored and maintained by Baoshuo with help from contributors.

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