Can the formatter repair invalid JSON?
No. It only formats valid JSON, but the browser error helps identify where the input could not be parsed.
Developer tools
Format and validate JSON in your browser.
Paste JSON to validate its syntax, make nested data readable, and copy the formatted result in one focused step.
1 output browser local
01
One input
Local onlyPaste JSON to format
Paste JSON and run this focused tool entirely in your browser.
How it works
Made for one clear task.
A JSON formatter makes nested objects and arrays easier to inspect, compare, and review. This page validates input as it formats, so malformed JSON returns an actionable browser error instead of a misleading output, while valid values and structure remain unchanged.
- Formats valid JSON with readable indentation
- Validates syntax before producing output
- Keeps source data on your device
Common questions
Format and validate JSON in your browser. FAQs
Does formatting change the data?
No. Formatting changes whitespace and indentation only; the JSON values and structure remain the same.