A JavaScript library for generating railroad diagrams like those used to describe languages' grammars.

The JavaScript library lets you define grammars using declarative-style calls:

  each('[',
    any('value', ','),
    ']')

to specify any number of comma separated values surrounded by square brackets.

See the example JSON grammar.

To use this library, simply download and include (via <script src=...></script>) the JavaScript library.

railroad.js will not work in browsers that do not support the CSS3 border-top-left-radius property. Luckily, all recent (as of Nov. 2010) major browsers do so.