From WikEmacs
Jump to navigation Jump to search
Description major mode for JavaScript programming
Author Steve Yegge
Maintainer FSF
Source http://bzr.savannah.gnu.org/lh/emacs/elpa/annotate/head:/packages/js2-mode/js2-mode.el
Part of Emacs no

js2-mode provides Emacs font-lock, indentation, and navigation for the JavaScript programming language. It also features an advanced JavaScript parser.

The original repository (at Google Code) seems to be outdated and https://github.com/mooz/js2-mode#readme seems to be a maintained fork. It includes several changes.

Basic setup

(package-install "js2-mode")
(require 'js2-mode)


  • accurate syntax highlighting using a recursive-descent parser
  • on-the-fly reporting of syntax errors and strict-mode warnings
  • undeclared-variable warnings using a configurable externs framework
  • "bouncing" line indentation to choose among alternate indentation points
  • smart line-wrapping within comments and strings
  • code folding:
    • show some or all function bodies as {...}
    • show some or all block comments as /*...*/
  • context-sensitive menu bar and popup menus
  • code browsing using the Imenu package
  • many customization options
  • strict recognition of the Ecma-262 language standard
  • support for most Rhino and SpiderMonkey extensions from 1.5 and up
  • parsing support for ECMAScript for XML (E4X, ECMA-357)

Common Customization

See Also

Tutorial Pages