JSON Formatter & Validator

Format, beautify and validate JSON online. Free JSON formatter with syntax highlighting, error detection and minify support.

What is JSON Formatter?

JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write. Our JSON Formatter tool helps you format, beautify, and validate JSON data instantly in your browser. Whether you are debugging API responses, working with configuration files, or cleaning up messy JSON, this tool processes everything client-side — your data never leaves your browser.

Features include pretty-printing with configurable indentation, minification for production use, and real-time error detection with helpful error messages pointing to the exact location of syntax issues.

How to Format JSON: A Complete Guide for Developers

Learn how to format, beautify and validate JSON data. Covers JSON syntax rules, common errors and best practices for working with JSON.

API Rate Limiting: Algorithms, Headers and Best Practices

Learn how API rate limiting works, the most common algorithms (token bucket, sliding window, fixed window), standard HTTP headers and best practices for both implementing and handling rate limits.