JSON Formatter & Validator
Format, validate, and minify JSON data instantly in your browser. Free online developer tool.
Input JSON
Output JSON
Formatted JSON will appear here...
Free JSON Formatter & Validator
Instantly format, validate, and minify your JSON data. This tool parses your JSON string, checks for syntax errors, and pretty-prints it with indentation for easy reading. Completely client-side and secure.
How to Use It
Paste your JSON into the input box — it's validated and pretty-printed instantly, with syntax errors highlighted if the JSON is malformed.
Example
Pasting {"name":"Alice","age":30} and formatting it produces a neatly indented, multi-line JSON object — much easier to read and debug.
Common Use Cases
- Debugging a minified or single-line API response.
- Validating that a JSON payload is syntactically correct.
FAQs
What happens if my JSON is invalid?
The tool highlights the syntax error so you can locate and fix the exact problem in your JSON.