Does this run my JavaScript?

No. Your code is parsed into an abstract syntax tree with Babel and re-printed — it is never executed, and this tool never uses eval() or the Function() constructor.

Does it handle modern syntax like optional chaining and nullish coalescing?

Yes — arrow functions, async/await, destructuring, template literals, optional chaining (?.), and nullish coalescing (??) are all parsed correctly.

Code Formatters

JavaScript Formatter

Format JavaScript into readable, consistently indented code. Parses the source with Babel (the same parser Prettier uses) so modern syntax — arrow functions, async/await, destructuring, optional chaining, template literals — is handled correctly. Your code is never executed.

Indentation

JavaScript

Formatted JavaScript

JavaScript Minifier

Minify JavaScript with Terser — a real parser, never regex or eval().

HTML Formatter

Beautify HTML, including embedded CSS and JavaScript.

Features

Parses your code with Babel rather than executing it
Handles modern syntax: arrow functions, async/await, destructuring, template literals, optional chaining, nullish coalescing
2, 4-space, or tab indentation
Preserves comments

How to use

Paste minified or messy JavaScript into the input.
Pick an indentation size and click Format.
Copy the result or download it as a file.

Example

Input

const f=(a,b)=>{return a+b};

Output

const f = (a, b) => {
  return a + b;
};

FAQ

Does this run my JavaScript?: No. Your code is parsed into an abstract syntax tree with Babel and re-printed — it is never executed, and this tool never uses eval() or the Function() constructor.
Does it handle modern syntax like optional chaining and nullish coalescing?: Yes — arrow functions, async/await, destructuring, template literals, optional chaining (?.), and nullish coalescing (??) are all parsed correctly.