JSON Formatter & Validator FREE
Tip: validate JSON before formatting; malformed JSON will be reported instead of silently producing incorrect output.
Format, beautify, minify and validate JSON instantly. Perfect for developers working with APIs, configurations and data files. No API required—all processing happens in your browser. New to JSON errors? See our JSON formatter guide.
Auto Format
Beautify JSON with proper indentation
Minify
Remove all whitespace and reduce size
Validate
Check JSON syntax instantly
100% Private
All processing in your browser
About JSON Formatter
The JSON Formatter is a powerful developer tool that helps you format, validate, and manipulate JSON data. Whether you're debugging API responses, configuring applications, or working with large datasets, this tool provides instant validation and formatting. Supports all JSON features including nested objects, arrays, strings, numbers, booleans and null values.
How To Use
- Paste or type JSON code in the input panel
- Select an operation: Format, Minify, Validate, or Sort Keys
- Click the Process button
- View the result with validation status
- Copy the output or download it as a .json file
- Use Swap to reverse input and output
Frequently Asked Questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data format used for storing and exchanging data. It's widely used in APIs, configuration files, and web applications.
Why format JSON?
Formatting JSON makes it readable for humans. It adds proper indentation and line breaks, making it easier to understand complex nested structures.
What's the difference between Format and Minify?
Format: Adds indentation and readability. Minify: Removes all whitespace to reduce file size (good for production).
Can it validate broken JSON?
The validator will detect syntax errors and show where they occur. It cannot fix invalid JSON, but it helps you identify the problem.
Is it free to use?
Yes! JSON Formatter is 100% free with no registration or API keys required.
Does it work offline?
Yes! Once loaded, all JSON processing happens locally in your browser. No internet required after initial load.