Configuration options

mathjax-node's main API has two sets of configuration options.

config({...})

The first set, passed to the config method, provides global configuration options.

{
  displayMessages: false, // determines whether Message.Set() calls are logged
  displayErrors:   true, // determines whether error messages are shown on the console
  undefinedCharError: false, // determines whether unknown characters are saved in the error array
  extensions: '', // a convenience option to add MathJax extensions
  fontURL: 'https://cdn.mathjax.org/mathjax/latest/fonts/HTML-CSS', // for webfont urls in the CSS for HTML output
  MathJax: { } // options MathJax configuration, see https://docs.mathjax.org
}

data: 
ex: 6,                          // ex-size in pixels
  width: 100,                     // width of container (in ex) for linebreaking and tags
  useFontCache: true,             // use <defs> and <use> in svg output?
  useGlobalCache: false,          // use common <defs> for all equations?
  linebreaks: false,              // do linebreaking?
  equationNumbers: "none",        // or "AMS" or "all"

  math: "",                       // the math to typeset
  format: "TeX",                  // the input format (TeX, inline-TeX, AsciiMath, or MathML)
  xmlns: "mml",                   // the namespace to use for MathML

  html: false,                    // return HTML output?
  css: false,                     // return CSS for HTML output?
  mml: false,                     // return mml output?
  svg: false,                     // return svg output?
  img: false,                     // return img tag for remote image?
  png: false,                     // return png image (as data: URL)?
  dpi: 144,                       // dpi for png image

  speakText: false,               // add spoken annotations to svg output?
  speakRuleset: "mathspeak",      // set speech ruleset (default (chromevox rules), mathspeak)
  speakStyle: "default",          // set speech style (mathspeak:  default, brief, sbrief)

  timeout: 10 * 1000,             // 10 second timeout before restarting MathJax
};

options requiring restart

MathJax, extensions, and fontURL are "sticky" and changes require a restart of the API (using the start() method).