JSON Formatter

Online Tool

Try JSON Formatter online at DevTools.at →

Use this tool directly in your browser - no installation required:

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• Available in 20+ languages
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What is JSON Formatter?

Format and beautify JSON with syntax validation. This is a standalone TypeScript/JavaScript implementation that you can use in your own projects.

Features

• Zero Dependencies - Lightweight with no external dependencies
• TypeScript Support - Full type definitions included
• Browser & Node.js - Works in both environments
• UTF-8 Support - Handles international characters correctly

Usage

import { format, minify, validate } from '@devtools-at/json-formatter';

const messyJson = '{"name":"John","age":30,"city":"New York"}';

// Format with 2-space indentation
const formatted = format(messyJson, { indent: 2 });
console.log(formatted);
// {
//   "name": "John",
//   "age": 30,
//   "city": "New York"
// }

// Minify JSON
const minified = minify(formatted);
console.log(minified); // {"name":"John","age":30,"city":"New York"}

// Validate JSON
console.log(validate(messyJson)); // { valid: true }
console.log(validate('{invalid}')); // { valid: false, error: "..." }

API Reference

Core Functions

The source code in src/index.ts contains the core implementation. You can copy and use these functions directly in your project.

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Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

MIT License - see the LICENSE file for details.