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JS Beautifier

Định dạng, căn lề code JavaScript dễ đọc


        

    





            

            

                

                                            
JS Beautifier

                                                                
JS Beautifier is a free online JavaScript formatter that transforms minified, compressed, or poorly indented code into clean, readable JavaScript with proper indentation and consistent structure. Whether you need to inspect a third-party bundle, prepare code for a team review, or simply make sense of auto-generated scripts, this JavaScript Beautifier works instantly in your browser with no installation required. It supports modern JavaScript syntax including ES6+, arrow functions, template literals, and async/await.

                                                                

                            
Benefits
The JS Beautifier automatically applies correct indentation, line breaks, and spacing so that dense, unreadable JavaScript becomes logically structured code that is far easier to understand and maintain. Because the tool runs entirely client-side in your browser, your source code never leaves your machine.
  • Restores readability to minified or obfuscated JavaScript files
  • Enforces consistent indentation style throughout the entire file
  • Handles modern ES6+ syntax including destructuring, spread operators, and classes
  • Instant results with no account, plugin, or setup required
Use cases
This tool fits naturally into everyday development and debugging workflows wherever readable JavaScript is needed quickly.
  • Inspecting minified bundles produced by Webpack, Rollup, or similar build tools
  • Cleaning up code before submitting it for a pull request or peer code review
  • Debugging JavaScript loaded from a CDN or vendor file that lacks a source map
  • Making auto-generated or exported scripts human-readable before editing them
How to use
Paste your JavaScript into the input area and click Beautify — the formatted output appears immediately on the right with proper indentation and structure restored.
  • Paste your JavaScript code into the input panel on the left
  • Click the Beautify button to format the code
  • Review the beautified output in the right panel
  • Click Copy to copy to clipboard or Download to save the formatted file
Frequently asked questions
Does JS Beautifier support modern ES6+ JavaScript? Yes, the tool fully supports ES6+ syntax including arrow functions, template literals, destructuring assignments, async/await, and other contemporary JavaScript features.
Is my code sent to a server or stored anywhere? No, all formatting happens locally in your browser — your code is never transmitted to or stored on any server.
Can it handle large minified JavaScript bundles? Yes, JS Beautifier can process large minified files; for very large bundles it is best to split the code into smaller sections to maintain optimal performance in the browser.
How is JS Beautifier different from using Prettier or ESLint? JS Beautifier is designed for quick, zero-configuration formatting directly in the browser, while Prettier and ESLint are development environment tools that require project setup and can also enforce code quality rules beyond formatting.