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    This repository contains a library that provides an API to call MathJax from Node.js programs. The API converts individual math expressions (in any of MathJax's input formats) into HTML (with CSS), SVG or MathML code.


    npm install mathjax-node

    to install mathjax-node and its dependencies.


    mathjax-node requires Node.js v4 or later.

    Breaking Changes in v1.0:

    mathjax-node v1.0 makes breaking changes to the following features from the pre-releases.

    • [CHANGED] lib/mj-single.js has been renamed to lib/main.js (and set as main in package.json, i.e., require('mathjax-node') will load it.
    • [REMOVED] lib/mj-page.js (API for processing HTML-fragments) and related CLI tools
    • [REMOVED] speech-rule-engine integration
    • [REMOVED] PNG generation
    • [REMOVED] CLI tools in bin/

    These features can easily be recreated in separate modules for greater flexibility. For examples, see

    Be sure to also check out other projects on NPM that depend on mathjax-node.

    Getting started

    mathjax-node provides a library, ./lib/main.js. Below is a very minimal example for using it - the tests and the examples mentioned above provide more advanced examples.

    // a simple TeX-input example
    var mjAPI = require("mathjax-node");
      MathJax: {
        // traditional MathJax configuration
    var yourMath = 'E = mc^2';
      math: yourMath,
      format: "TeX", // "inline-TeX", "MathML"
      mml:true, //  svg:true,
    }, function (data) {
      if (!data.errors) {console.log(data.mml)}
      // will produce:
      // <math xmlns="" display="block">
      //   <mi>E</mi>
      //   <mo>=</mo>
      //   <mi>m</mi>
      //   <msup>
      //     <mi>c</mi>
      //     <mn>2</mn>
      //   </msup>
      // </math>


    mathjax-node exports three methods, config, start, typeset.


    The config method is used to set global configuration options. Its default options are

      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" (i.e., no glyph in the configured fonts) are saved in the error array
      extensions: '', // a convenience option to add MathJax extensions
      fontURL: '', // for webfont urls in the CSS for HTML output
      MathJax: { } // standard MathJax configuration options, see for more detail.

    Note. Changes to these options require a restart of the API using the start() method (see below).


    The start method start (and restarts) mathjax-node. This allows reconfiguration.

    Note. This is done automatically when typeset is first called (see below).

    typeset(options[, callback])

    The typeset method is the main method of mathjax-node. It expects a configuration object options and optionally a callback.

    If no callback is passed, it will return a Promise.

    Once called, typeset can be called repeatedly and will optionally store information across calls (see state below).

    The following are the default input options.

      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,              // automatic linebreaking
      equationNumbers: "none",        // automatic equation numbering ("none", "AMS" or "all")
      cjkCharWidth: 13,               // width of CJK character
      math: "",                       // the math string to typeset
      format: "TeX",                  // the input format (TeX, inline-TeX, AsciiMath, or MathML)
      xmlns: "mml",                   // the namespace to use for MathML
      html: false,                    // generate HTML output
      htmlNode: false,                // generate HTML output as jsdom node
      css: false,                     // generate CSS for HTML output
      mml: false,                     // generate MathML output
      mmlNode: false,                 // generate MathML output as jsdom node
      svg: false,                     // generate SVG output
      svgNode: false,                 // generate SVG output as jsdom node
      speakText: true,                // add textual alternative (for TeX/asciimath the input string, for MathML a dummy string)
      state: {},                    // an object to store information from multiple calls (e.g., <defs> if useGlobalCache, counter for equation numbering if equationNumbers ar )
      timeout: 10 * 1000,             // 10 second timeout before restarting MathJax

    Promise.resolve(result,options) / Promise.reject(errors) / callback(result, options)

    mathjax-node returns two objects to Promise.resolve or callback: a result object and the original input options.

    The result object will contain (at most) the following structure:

      errors:                     // an array of MathJax error messages if any errors occurred
      mml:                        // a string of MathML markup if requested
      mmlNode:                    // a jsdom node of MathML markup if requested
      html:                       // a string of HTML markup if requested
      htmlNode:                   // a jsdom node of HTML markup if requested
      css:                        // a string of CSS if HTML was requested
      svg:                        // a string of SVG markup if requested
      svgNode:                    // a jsdom node of SVG markup if requested
      style:                      // a string of CSS inline style if SVG requested
      height:                     // a string containing the height of the SVG output if SVG was requested
      width:                      // a string containing the width of the SVG output if SVG was requested
      speakText:                  // a string of speech text if requested
      state: {                    // the state object (if useGlobalCache or equationNumbers is set)
               glyphs:            // a collection of glyph data
               defs :             // a string containing SVG def elements
               AMS: {
                    startNumber:  // the current starting equation number
                    labels:       // the set of labels
                    IDs:          // IDs used in previous equations

    If the errors array is non-empty, the Promise will reject, and be passed the errors array.

    The options contains the configuration object passed to typeset; this can be useful for passing other data along or for identifying which typeset() call is associated with this (callback) call (in case you use the same callback function for more than one typeset()).


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