Format and beautify minified or poorly formatted JavaScript code.
Beautified Output
Paste minified or poorly formatted JavaScript and choose your preferred indentation style. The beautifier will format the code for readability with proper spacing and line breaks.
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What is the JavaScript Beautifier?
A JavaScript beautifier is a tool that takes compressed or poorly formatted JavaScript code and reconstructs it with proper indentation, line breaks, and spacing. It reverses the effects of minification (code compression) while preserving the code's functionality, making it human-readable again.
How it works
The beautifier parses your JavaScript input character by character, identifies code blocks (functions, loops, conditionals, objects), and applies consistent indentation rules. It detects statement boundaries, adds newlines after semicolons and braces, and inserts spaces around operators. The result is logically identical to the original code but visually organized for easy reading.
Examples
Input
Result
Notes
function greet(name){if(name){console.log('Hello, '+name)}else{console.log('Hello, stranger')}}
function greet(name) {
if (name) {
console.log('Hello, ' + name)
} else {
console.log('Hello, stranger')
}
}
Minified one-liner expanded into readable multi-line code with proper indentation
Nested object and array unpacked with consistent indentation and spacing
let x=5;for(let i=0;i<10;i++){x+=i}
let x = 5;
for (let i = 0; i < 10; i++) {
x += i
}
Loop structure clarified with spaces around operators and proper brace positioning
How to use the JavaScript Beautifier
Paste or upload your minified or poorly formatted JavaScript code into the input box
Optionally adjust indentation settings (spaces or tabs, indent size)
Click 'Beautify' or press Enter to reformat the code
Review the output in the editor for readability and correctness
Copy the formatted code to your clipboard with the Copy button
Paste into your project, IDE, or documentation
Benefits
Instantly reverse minification to read obfuscated third-party code
Improve code readability for debugging and learning
Share clean, formatted code with team members without comments explaining structure
Maintain consistent indentation style across your codebase
Spot logic errors and syntax issues more easily in formatted code
Save time vs. manually formatting large blocks of code
Tips & common mistakes
Common mistakes
Pasting non-JavaScript code (HTML, CSS, JSON) and expecting the same result—use a language-specific formatter instead
Assuming the beautified code will fix logic errors or security vulnerabilities—beautification only reformats, it doesn't debug
Forgetting to check for syntax errors after beautification, especially in already-malformed input
Tips
If your input has syntax errors, the beautifier may fail or produce unexpected output—validate your code in your IDE first
Use a 2-space or 4-space indent; most teams standardize on one—configure your beautifier to match your project's style guide
Chain beautification with a linter (ESLint) to not only format but also enforce code quality rules
Beautified code is larger than minified code—beautify for development/reading only; re-minify before production deployment
Frequently asked questions
Will beautifying my code change how it runs?
No. Beautification only changes whitespace and formatting, not the code's logic or functionality. The output JavaScript behaves identically to the input.
What's the difference between a beautifier and a linter?
A beautifier reformats code for readability (spacing, indentation, line breaks). A linter (like ESLint) checks code quality, finds bugs, and enforces style rules. Use both: beautify first, then lint.
Can I beautify obfuscated or encrypted JavaScript?
Beautification works on obfuscated code (which is still valid JavaScript, just with confusing variable names). True encryption cannot be reversed by a beautifier—you'd need the decryption key.
What indentation options does the beautifier support?
Most beautifiers let you choose spaces or tabs and set the indent size (commonly 2 or 4 spaces). Some also let you control brace style (Allman vs. One True Brace Style).
Is it safe to beautify untrusted JavaScript code?
Beautification itself is safe—it's just reformatting text. However, never execute untrusted code. Review the beautified output carefully before running it in your application.
Can I beautify code in other languages like Python or Java?
No, this tool is JavaScript-specific. Use language-specific formatters: Black for Python, prettier for Java, rustfmt for Rust, etc.