JSON Formatter/Validator
Pretty-print, minify, and validate JSON with error reporting.
Examples
| Input | Result |
|---|---|
| {"name":"Alice","age":30} | { "name": "Alice", "age": 30 } |
| { "items": [1, 2, 3] } | {"items":[1,2,3]} (minified) |
| {"a":1,,} | Error: Unexpected token at position 6 |
| [{"id":1},{"id":2}] | [ { "id": 1 }, { "id": 2 } ] |
About this tool
Paste raw JSON into the editor and instantly get formatted output with proper indentation. The tool validates your input as you type and flags syntax errors with their position, which saves time compared to scanning through long payloads manually.
You can also minify JSON when you need a compact representation for config files or API payloads. Both modes handle nested objects, arrays, and all standard JSON value types.
Frequently asked questions
What happens if my JSON has syntax errors?
The formatter will catch the error and show you the exact position where parsing failed, so you can jump straight to the problem.
Can I switch between pretty-printed and minified output?
Yes. You can pretty-print JSON with standard 2-space indentation or minify it into a single line with all whitespace removed.
Is my JSON data sent to a server?
No. All formatting and validation runs entirely in your browser. Nothing leaves your machine.