JavaScript Formatter
Format and beautify JavaScript code with customizable indentation or minify scripts to remove extra whitespace and comments.
Run tool
The JavaScript Formatter organizes and restructures JavaScript scripts for improved readability or compact distribution. When reviewing compressed scripts or preparing code for sharing, paste your snippet into the editor and choose between beautifying and minifying modes. Beautification introduces consistent indentation using zero to eight spaces per level, defaulting to two spaces when unspecified. It preserves existing line breaks up to two consecutive empty lines, removes unnecessary spacing inside parentheses, and formats control flow blocks into clear structures. Choosing the minification option strips comments outside string literals, collapses redundant whitespace, removes extra blank lines, and trims outer space while protecting strings and escaped characters. The formatter processes text payloads up to 1,000,000 UTF-8 bytes in size, providing an immediate preview of the transformed script directly in the output panel. It serves as a practical formatting utility for web developers, students, and engineers cleaning up functions, conditional blocks, or configuration files.
Instructions
- Paste or type your JavaScript snippet into the code input area.
- Specify an indentation width between 0 and 8 spaces, or leave it at the default of 2.
- Select your desired formatting mode, choosing either beautify or minify.
- Run the formatter to view and copy the restructured JavaScript code in the output window.
Examples
- Beautifying a single-line function: inputting function greet(name){console.log('Hello '+name);} with 2 spaces creates a structured multi-line block with indented statements.
- Minifying commented script: inputting a multi-line calculation with inline comments strips the comments outside quoted strings and collapses unnecessary whitespace.
FAQ
What happens if the input is left empty?
Submitting empty text or whitespace-only input completes normally and returns an empty output.
What is the maximum allowed script size?
The formatter accepts JavaScript text payloads up to 1,000,000 UTF-8 bytes. Inputs exceeding this size will not be processed.
Does minification alter text inside string literals?
No. String literal contents, including escaped characters and spaces within quotes, remain preserved during minification.
What indentation levels are supported?
You can select any integer indentation from 0 to 8 spaces. Any value outside this range or non-integer input automatically defaults to 2 spaces.