Best Free Online Developer Tools to Use in 2026
A practical, opinionated list of the best free online developer tools worth using in 2026, organized by category so you can find what you need fast.
Aug 08, 2026
JavaScript Beautifier & Formatter
Format, beautify, and organize your JavaScript, JSX, and TSX code instantly. Supports indentation control, semicolons, quote style, and more.
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What is JavaScript Beautification?
JavaScript (JS) is one of the most widely used programming languages for web development. Clean, consistently formatted JavaScript code is essential for readability, debugging, and team collaboration.
A JavaScript beautifier (or formatter) automatically applies consistent indentation, manages semicolons, standardizes quote usage, and restructures your code according to best practices. This helps reduce syntax errors and makes your codebase more maintainable.
How to Use
- Paste your code — Copy and paste any JavaScript, JSX, or TSX code into the top textarea. You can also type directly or use the Example link to load sample code.
- Choose options — Select indentation style (2 spaces, 4 spaces, or Tab), semicolon behavior (Preserve, Always add, or Remove), and quote style (Preserve, Single, or Double).
- Format or Minify — Click Format JS to beautify with proper indentation, or Minify to compress into a compact form.
- Copy or download — Use the copy button on the output area or click Download .js to save the result.
Frequently Asked Questions
Does this tool support JSX and TSX?
Yes. The beautifier handles JSX (React) and TSX (TypeScript React) syntax correctly, preserving component tag structures and expression brackets.
Is my JavaScript data stored on a server?
No. All processing happens entirely in your browser using JavaScript. Your code never leaves your device.
What's the difference between semicolon options?
Preserve keeps your existing semicolons as-is. Always add ensures every statement ends with a semicolon. Remove strips unnecessary semicolons (ASI style).
Does this tool handle TypeScript?
Yes. The beautifier works well with TypeScript syntax including type annotations, interfaces, generics, and enums. For best results with complex TypeScript projects, consider using a dedicated TypeScript formatter.
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