What does this JavaScript formatter do?

This tool takes minified or messy JavaScript and reformats it with proper indentation, line breaks after statements, and consistent spacing. It also has a minify mode that strips whitespace and comments to reduce file size.

Does it handle ES6+ syntax?

Yes. The formatter correctly handles arrow functions, template literals (backtick strings), destructuring, const/let, and other modern JavaScript syntax. It tracks string literals to avoid breaking them during formatting.

Is this a full parser or AST-based formatter?

This is a lightweight indentation-based formatter, not a full AST parser like Prettier. It handles most common JavaScript patterns well and is designed for quick formatting. For strict style enforcement, use a dedicated tool like Prettier or ESLint.

Is my JavaScript data sent to a server?

No. All processing happens entirely in your browser. Your code never leaves your device.

CalcHive

JavaScript Formatter & Beautifier

Format, beautify, and minify JavaScript code instantly. Handles strings, template literals, comments, and nested blocks. Free online JS beautifier.

Indent:

Examples

Function

In:function greet(name){const msg="Hello, "+name+"!";console...

Arrow & object

In:const config={api:"https://api.example.com",timeout:5000,...

Array methods

In:const nums=[1,2,3,4,5];const doubled=nums.map((n)=>{retur...

JavaScript Input

Formatted Output

How to Use JavaScript Formatter & Beautifier

Paste your JavaScript in the input area.
Choose an indentation size (2 or 4 spaces).
The formatted JavaScript appears instantly in the output.
Switch to "Minify" to compress JavaScript for production.
Click "Copy" to copy the result.

About JavaScript Formatting

JavaScript is the most widely used programming language on the web. Readable, well-formatted JavaScript is critical for collaboration, code reviews, and debugging. This tool provides quick formatting and minification for JavaScript code without requiring a build setup.

Formatting vs Minification

Formatting adds indentation and line breaks to improve readability. Minification strips whitespace, removes comments, and shortens the code for production use. Minified JavaScript loads faster and reduces bandwidth costs. In production, most teams use bundlers like Webpack, Vite, or esbuild for automated minification, but this tool is handy for one-off tasks.

Need to format other code? Try our HTML Formatter, CSS Formatter, or JSON Formatter.

Frequently Asked Questions

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