JS Beautifier

JS Beautifier is an open source tool for beautifying minified code, allowing developers to take a blob of text and transform it into an indented block of code (again).

JS Beautifier is available as a bookmarklet, a  Python CLI, a Node.js CLI, or Web-based utility.

Besides raw CSS, LESS syntax is also supported.

Features:
Works with JSON and JSONP data
Customize wrapping style
Detects packers and obfuscators
Can break lines on chained methods
Can preserve empty lines
Can keep array indentation
Can keep a space before conditional: "if(x)" / "if (x)"
Can use JSLint-happy formatting tweaks
Can unescape printable chars
Set custom indentation
Set braces display position

What is new in this release:

• Initial implementation of comma-first formatting - Diff-friendly literals!
• CSS: Add newline between rules
• LESS: improved function parameter formatting
• HTML: options for wrapping attributes
• General bug fixing

What is new in version 1.5.5:

• Initial implementation of comma-first formatting - Diff-friendly literals!
• CSS: Add newline between rules
• LESS: improved function parameter formatting
• HTML: options for wrapping attributes
• General bug fixing

Requirements:

• JavaScript enabled on client side