KaTeX/docs/api.md

id, title

id	title
api	API

In-browser rendering

Call katex.render with a TeX expression and a DOM element to render into:

katex.render("c = \\pm\\sqrt{a^2 + b^2}", element);

To avoid escaping the backslash (double backslash), you can use String.raw (but beware that ${, \u and \x may still need escaping):

katex.render(String.raw`c = \pm\sqrt{a^2 + b^2}`, element);

If KaTeX can't parse the expression, it throws a katex.ParseError by default. See handling errors for configuring how to handle errors.

Server side rendering or rendering to a string

To generate HTML on the server or to generate an HTML string of the rendered math, you can use katex.renderToString:

var html = katex.renderToString("c = \\pm\\sqrt{a^2 + b^2}");
// '<span class="katex">...</span>'