JavaScript Formatter
Format and beautify JavaScript code with proper syntax and indentation.
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About JavaScript Formatter
JavaScript is a programming language used for web development. Format your JavaScript code for better readability and maintainability.
Common Use Cases:
- Formatting minified JavaScript
- Code beautification
- Preparing code for production
- Improving code readability
Frequently Asked Questions
JavaScript minification removes comments, whitespace, and newlines from code. Advanced minifiers also shorten variable names, which our basic minifier does not. Typical space savings from basic minification are 20–40%. Advanced minification (variable renaming, dead code elimination) can achieve 50–70% reduction. Minification is standard practice for all production JavaScript to improve page load speed.
You can "beautify" minified JavaScript to make it readable again — that is what the Format button does. However, beautification restores structure but cannot restore original variable names if they were shortened, or recover comments that were removed. If you need the original source code, use source maps (a developer tool that maps minified code back to the original) or access the repository where the source was published.
Yes. The formatter handles modern JavaScript including arrow functions, template literals, destructuring, spread operators, async/await, and class syntax. It uses bracket and semicolon detection to format indentation rather than language-specific parsing, so it works on any version of JavaScript as well as TypeScript, JSX, and similar syntaxes.