Format JavaScript Code
This JavaScript formatter beautifies minified or messy code with proper indentation, spacing, and line breaks. Configure formatting options below and paste your code to format it instantly. All processing happens in your browser.
About JavaScript Formatter
A JavaScript beautifier transforms poorly formatted or minified JavaScript code into clean, readable code with consistent indentation and spacing. This makes the code structure immediately visible and helps developers understand control flow, identify bugs, and maintain the codebase.
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JavaScript Formatter FAQ
What does a JavaScript formatter do?
A JavaScript formatter (or beautifier) takes minified or messy JavaScript code and adds consistent indentation, line breaks, and spacing according to standard code style conventions. It makes code more readable without changing its functionality.
Is this JavaScript formatter safe for production code?
Yes. All processing runs entirely in your browser using JavaScript. Your code is never sent to any server. The formatter only adjusts whitespace and formatting — it does not modify the logic or functionality of your code.
What indentation should I use for JavaScript?
2 spaces and 4 spaces are both common in JavaScript. 2 spaces is used by Airbnb style guide and Google style guide. 4 spaces is common in older codebases and some enterprise projects. Tabs are also used but less common. The choice is a matter of team preference.
Should I use semicolons in JavaScript?
Both styles are valid. Using semicolons is more traditional and recommended by style guides like Airbnb and Standard JS with semicolons. Omitting semicolons (ASI - Automatic Semicolon Insertion) is supported by the language but requires understanding edge cases where ASI can fail.
What is the difference between single quotes and double quotes in JavaScript?
Functionally identical — JavaScript treats both the same. Single quotes are slightly more common in modern JavaScript and are the default for tools like Prettier. Double quotes are required in JSON. Choose based on team preference or existing codebase style.