ECMAScript ES2024 Beautifier, Minifier & Syntax Validator

JavaScript Formatter

Beautify, format, validate, and minify JavaScript code with customizable indentation rules, ASI safety checks, AST structure analysis, and safe sandboxed execution console.

Load Preset Template:
Indent Size:
Indent Type:
Line Wrap (Print Width):
Semicolons:
Quote Style:
Bracket Spacing:
Input JavaScript Code
0 chars
0 chars
JavaScript Structure Valid: No syntax errors detected.
Valid ES2024
Lines:0|Input Chars:0|Output Chars:0|Functions:0|Classes:0|Async / Await:0|Promises:0|Comments:0
ECMAScript ES2024 Formatting Standards & Developer Specification Reference
ASI Safety Preservation

Automatic Semicolon Insertion (ASI) sensitive boundaries (e.g., return \n { ... }, array indexing) are preserved without introducing accidental semantic changes.

ES6+ Class & Private Fields

Constructors, private class fields (#privateProp), static blocks (static { ... }), arrow functions, and destructuring are preserved intact.

Execution Sandbox Security

Console execution preview runs in a sandboxed <iframe sandbox="allow-scripts"> without allow-same-origin, preventing script access to local cookies or parent storage.

Template Literals & Regex

Template literal expressions (\`Hello \${name}\`), multiline backtick strings, and complex regular expression literals (/https?:\\/\\//gi) remain preserved.