Prettify と format JavaScript code instantly 無料のonline JSプリティファイアーで. Transform minified or messy JS into clean, readable output. 100%クライアントサイド.
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About JavaScript Prettifier
Our JavaScript Prettifier is a free online tool that instantly transforms minified or poorly formatted JavaScript code into clean, readable, properly indented code. Whether you're debugging minified production code, reviewing someone else's messy scripts, or just want to standardize your code formatting, this tool handles it all. All processing happens entirely in your browser — your code never leaves your device.
Features
Instant prettification of minified or compressed JavaScript code
Smart indentation with proper nesting for functions, objects, and arrays
Preserves code functionality while improving readability
One-click copy to clipboard for easy use in your projects
Download prettified code as a .js file
Error detection with clear syntax error messages
100% free, private, and client-side processing
How to Use
Paste or type your JavaScript code into the input area
Click the "Prettify JS" button to format your code instantly
Review the formatted output in the result panel below
Use the Copy button to copy the prettified code to your clipboard
Or use Download to save the formatted code as a .js file
Common Use Cases
Developers debugging minified production JavaScript from CDN sources
Code reviewers examining compressed or obfuscated scripts
Students learning JavaScript by reading properly formatted examples
Teams standardizing code formatting across different editor configurations