JSON Formatter & Validator

About this json formatter & validator

JSON is the lingua franca of modern APIs. It is human-readable when formatted well, painful when minified, and frustrating when broken — a missing comma or quote turns a 10 KB response into an "invalid JSON" error with no clue where the problem is.

The formatter handles all three needs: pretty-print (with 2-space indentation, sorted output where the JSON spec allows), minify (removes all whitespace, used for transport), and validate (reports the exact line and character of any error). Common errors — trailing commas, unquoted keys, single-quoted strings — get specific messages, not just "syntax error".

For deeply nested or large JSON, the formatted output uses proper indentation so you can collapse sections in any modern code editor and navigate by structure. For API debugging, paste the response, format, and the structure of the data becomes obvious in seconds.

How to use it

1. Paste your JSON into the input field.
2. Click Pretty Print for human-readable output.
3. Click Minify to strip all whitespace.
4. Click Validate to confirm the structure (errors include line numbers).

Tips & notes

• For API debugging, pretty-print the response and the data structure becomes obvious. Minified JSON hides everything in one line.
• Trailing commas are valid in modern JavaScript objects but NOT in JSON. The formatter will flag them as invalid.
• Keys and string values must use double quotes in JSON. Single quotes (valid in JavaScript) are not valid JSON.

Frequently asked questions