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# markdown-it-katex
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Add Math to your Markdown
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[](https://travis-ci.org/waylonflinn/markdown-it-katex)
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[KaTeX](https://github.com/Khan/KaTeX) is a faster alternative to MathJax. This plugin makes it easy to support in your markdown.
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Need convincing?
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* Check out the comparative benchmark: [KaTeX vs MathJax](https://jsperf.com/katex-vs-mathjax/42)
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* Try it in your browser: [markdown-it-katex demo](http://waylonflinn.github.io/markdown-it-katex/)
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## Usage
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Install markdown-it
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```
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npm install markdown-it
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```
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Install the plugin
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```
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npm install markdown-it-katex
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```
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Use it in your javascript
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```javascript
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var md = require('markdown-it')(),
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mk = require('markdown-it-katex');
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md.use(mk);
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// double backslash is required for javascript strings, but not html input
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var result = md.render('# Math Rulez! \n $\\sqrt{3x-1}+(1+x)^2$');
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```
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Include the KaTeX stylesheet in your html:
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```html
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<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.5.1/katex.min.css">
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```
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If you're using the default markdown-it parser, I also recommend the [github stylesheet](https://github.com/sindresorhus/github-markdown-css):
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```html
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/github-markdown-css/2.2.1/github-markdown.css"/>
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```
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`KaTeX` options can be supplied with the second argument to use.
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```javascript
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md.use(mk, {"throwOnError" : false, "errorColor" : " #cc0000"});
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```
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## Examples
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### Inline
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Surround your LaTeX with a single `$` on each side for inline rendering.
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```
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$\sqrt{3x-1}+(1+x)^2$
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```
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### Block
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Use two (`$$`) for block rendering. This mode uses bigger symbols and centers
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the result.
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```
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$$\begin{array}{c}
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\nabla \times \vec{\mathbf{B}} -\, \frac1c\, \frac{\partial\vec{\mathbf{E}}}{\partial t} &
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= \frac{4\pi}{c}\vec{\mathbf{j}} \nabla \cdot \vec{\mathbf{E}} & = 4 \pi \rho \\
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\nabla \times \vec{\mathbf{E}}\, +\, \frac1c\, \frac{\partial\vec{\mathbf{B}}}{\partial t} & = \vec{\mathbf{0}} \\
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\nabla \cdot \vec{\mathbf{B}} & = 0
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\end{array}$$
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```
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## Syntax
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Math parsing in markdown is designed to agree with the conventions set by pandoc:
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Anything between two $ characters will be treated as TeX math. The opening $ must
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have a non-space character immediately to its right, while the closing $ must
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have a non-space character immediately to its left, and must not be followed
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immediately by a digit. Thus, $20,000 and $30,000 won’t parse as math. If for some
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reason you need to enclose text in literal $ characters, backslash-escape them and
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they won’t be treated as math delimiters.
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## Math Syntax Support
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KaTeX is based on TeX and LaTeX. Support for both is growing. Here's a list of
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currently supported functions:
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[Function Support in KaTeX](https://github.com/Khan/KaTeX/wiki/Function-Support-in-KaTeX)
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