JSON Formatter
Validate and format JSON locally while preserving your original values.
JSON stays in this browser tab. No uploads to a server, storage or remote validation.
Input
Local processing ยท 1 MB limitJSON source
Output
Formatted JSON
Formatted JSON appears here after validation succeeds.
Formatting changes whitespace only. Number digits, string escapes, key order and duplicate keys are preserved. Duplicate keys can be interpreted differently by other tools. Strict JSON only: no comments, trailing commas or JSON Schema validation.