JS Beautifier

Beautify and format minified or compressed JavaScript code with proper indentation.

100% Client-Side Local Execution

Upload Data

1

function greet(name){if(name){return "Hello, "+name+"!";}else{return "Hello, World!";}}var result=greet("Alice");console.log(result);

function greet(name){if(name){return "Hello, "+name+"!";}else{return "Hello, World!";}}var result=greet("Alice");console.log(result);

function greet(name) {
  if(name) {
    return "Hello, "+name+"!";
  }else {
    return "Hello, World!";
  }
}var result=greet("Alice");
console.log(result);

function greet(name) {
  if(name) {
    return "Hello, "+name+"!";
  }else {
    return "Hello, World!";
  }
}var result=greet("Alice");
console.log(result);

What is JS Beautifier?

This javascript beautifier takes minified or poorly indented JavaScript and reformats it into readable code with consistent spacing, line breaks, and indentation. It's built for debugging minified production scripts, reviewing code pulled from a bundle, or just cleaning up a messy file before committing it. Works as a js formatter in the browser, so nothing you paste gets uploaded anywhere.

Technical Execution

The tool parses your JavaScript into tokens (keywords, brackets, operators, strings) and rebuilds the source using standard formatting rules: consistent indent width, line breaks after statements and block openings, and spacing around operators. It does not change logic or variable names, only whitespace and layout, so the executed behavior of the code stays identical.

Zero Data Storage Guarantee

JavaScript often contains API endpoints, internal function names, or business logic you don't want sitting on a third-party server. This beautifier runs entirely in your browser tab using JavaScript's own parsing, so your code is never transmitted, logged, or stored anywhere.

How to Use JS Beautifier (Step-by-Step Guide)

Paste or type your minified or messy JavaScript into the input panel
The tool automatically parses and reformats the code
Adjust indentation size (2 or 4 spaces, or tabs) if the options are shown
Review the beautified output in the result panel
Copy the formatted code or download it as a .js file

Frequently Asked Questions (FAQ)

Q: Does this javascript beautifier change how my code runs?

A: No. It only changes whitespace, indentation, and line breaks — variable names, logic, and execution order are untouched.

Q: Is this js beautifier free to use?

A: Yes, it's free with no account or sign-up required, and there's no limit on how many times you use it.

Q: Can it handle minified code with no line breaks at all?

A: Yes, that's the main use case — it re-inserts line breaks and indentation into single-line minified scripts so you can actually read them.

Q: Will it fix syntax errors in my JavaScript?

A: No, it formats valid JavaScript. If your code has a syntax error, the parser will likely fail and show an error instead of output.

Q: How is this different from Prettier?

A: Prettier is a full-featured opinionated formatter usually run via build tools or editors; this tool is a quick in-browser option for one-off formatting without installing anything.

Q: Does it support ES6+ syntax like arrow functions and async/await?

A: Yes, modern JavaScript syntax including arrow functions, template literals, destructuring, and async/await is supported.

Q: Can I format JavaScript online without installing Node or an editor extension?

A: Yes, that's exactly what this tool is for — paste code and get formatted output instantly in your browser.

Q: Is there a size limit on the code I can paste in?

A: Very large files (tens of thousands of lines) may slow down the browser tab, but typical scripts and modules format instantly.

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