JSON Formatter & Validator
Prettify, minify and validate your JSON instantly â 100% in your browser
About the JSON Formatter & Validator
Our free JSON Formatter is the fastest way to beautify and validate JSON data directly in your browser. Whether you're debugging an API response, working with configuration files, or reviewing data payloads, this tool helps you instantly make unreadable, minified JSON human-friendly.
What is JSON?
JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format. It's the standard format for APIs, configuration files, and data storage. While machines can read compact, minified JSON, humans need it properly indented to understand the structure quickly.
Features
- Format / Prettify â Adds proper indentation (2 or 4 spaces) to make JSON readable
- Minify â Removes all whitespace to produce compact JSON, ideal for production
- Validate â Instantly checks if your JSON is valid and shows the exact error location
- File size stats â See the key count, line count, and size in KB
- Copy output â One-click copy to clipboard
Privacy & Security
All processing happens 100% in your browser. Your JSON data never leaves your device and is never sent to any server. This makes our tool safe to use with sensitive configuration data, API keys, and private information.
How to Use
Paste your JSON into the input field and click Format to beautify it instantly. Use the indent selector to choose between 2-space and 4-space indentation. Click Validate to check if the JSON is syntactically correct. If there's an error, the output will show the exact error message to help you fix it quickly.