JS Formatter

Beautify and format messy JavaScript code, making it structured and highly readable.

The JS Formatter (JavaScript Beautifier) instantly applies standard indentation and spacing to your JavaScript code. This makes complex logic easier to understand, maintain, and debug. Format your JavaScript code now!

Paste your JavaScript code here. Example: function test(){return true;}

Please enter some JavaScript code to format. The input field cannot be empty.

Enter your JS Code Here

Formatting Options

Indent Size

Max Line Length

Preserve Newlines

Keep existing line breaks

Braces on Own Line

Allman-style bracing

Formatted JavaScript

Original Size

Formatted Size

Lines of Code

formatted lines

Functions

detected

Formatting Complete! Processed lines of code. Size by bytes.

JavaScript Output

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How to Use

Step-by-step guide 3 steps

1 Enter Messy JS: Paste your unformatted, highly complex, or minified JavaScript code.
2 Format: Click "Beautify JavaScript".
3 View Readable Script: The output is cleanly indented and spaced JavaScript code, making logic and control flow (loops, functions) easy to follow.

FAQ

Common questions 3 questions

Does JavaScript formatting affect execution speed?

No, the JavaScript engine on the client side executes the same code regardless of formatting. However, the slightly larger file takes marginally longer to download.

Can this unminify obfuscated JS?

No. JS obfuscation changes variable names and logic flow to protect code, which a formatter cannot reverse. It only makes the scrambled text easier to read.

Does the formatter fix missing semicolons?

Some formatters attempt to intelligently insert missing semicolons (using Automatic Semicolon Insertion - ASI), but it's not a guarantee against all syntax errors.

Use Cases & Examples

Real-world applications 3 examples

Logic Review

Example Keyword: beautify javascript code for review
Instantly apply proper structure to complex logic functions and control statements (if/else, for loops).

Learning & Teaching

Example Keyword: format script for teaching
Clean up messy code examples to present clear, easily understandable JavaScript to students or peers.

Debugging Complex Apps

Example Keyword: js formatter for error analysis
Use clean code to quickly trace execution flow and isolate where an unexpected app behavior originates.