{ } Developer Tool
Format & Validate
JSON Online
Instantly format, minify, and validate JSON with error detection. Works entirely in your browser — no data sent to servers.
Formatted JSON will appear here...Frequently Asked Questions
What is a JSON formatter?
A JSON formatter takes compressed or hard-to-read JSON text and formats it with proper indentation and line breaks for readability.
How do I validate JSON?
Click the "Validate" button to check if your JSON is valid. If there are errors, the exact error message will be displayed.
Which indent size should I choose?
2 spaces is compact and widely used. 4 spaces is more readable. Choose based on your team's coding standards.
What is JSON minification?
JSON minification removes all whitespace and newlines to minimize file size. It is commonly used for API responses and data transfer.