How JavaScript Beautifier Works
The beautifier scans your code and identifies strings, template literals, regular expressions and comments so it can leave their contents completely untouched. Everywhere else, it inserts a new indented line after every {, before every }, and after every ;.
How to Use This Tool
- Paste your JavaScript into the input box, minified or not.
- Select Beautify JavaScript.
- Copy the indented result from the output box.
Example
Input: function add(a,b){return a+b}
Output:
function add(a, b) {
return a+b
}Helpful Tips
- This tool reformats structure (braces, semicolons, indentation) — it doesn't rename variables or restructure logic, so behavior is never affected.
- Because it's a lightweight, browser-based formatter rather than a full parser, extremely unusual syntax may not indent perfectly — spot-check the result on complex files.
Frequently Asked Questions
Will this change how my code behaves?
No — only whitespace and line breaks are added. Strings, comments and regular expressions are copied through untouched, so functionality is unaffected.
Does it support modern JavaScript syntax?
Yes, it works at the character level rather than parsing a specific syntax version, so arrow functions, template literals, classes and async/await are all safe to format.
Is my code uploaded anywhere?
No, formatting happens entirely in your browser.
This tool runs entirely in your browser. Your input is not uploaded to any server.