Esprima (esprima.org, BSD license) is a high performance,
standard-compliant ECMAScript
parser written in ECMAScript (also popularly known as
JavaScript).
Esprima is created and maintained by Ariya Hidayat,
with the help of many contributors.
Features
Esprima serves as a building block for some JavaScript
language tools, from code instrumentation
to editor autocompletion.
Esprima runs on many popular web browsers, as well as other ECMAScript platforms such as
Rhino and Node.js.
For more information, check the web site esprima.org.