A LITTLE ORDER, A LOT LESS WORK.
JSON Formatter
Validate JSON syntax, format indentation and inspect nested structures.
01 — 18Start with data. Make room for work.
Batch processing available
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ONE OPERATION, MULTIPLE FILES
Do repeated work in one pass.
Files use the options above. Up to 10 files, 2 MiB each.
Files stay on your device. Download each result independently.
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All processing happens in this browser.
How to use it
- Paste JSON or open a local file, then format or minify it. Switch the result to Structure for a collapsible tree.
- Select a tree field to inspect its JSON Pointer, type and value. Search expands matching branches; large trees load children on demand.
- Unsafe integer identifiers are rejected to prevent rounding. Store long IDs as strings; decimal numbers use JavaScript numeric precision.
Will invalid JSON be repaired?
No. Fix the reported syntax error without guessing or discarding fields.
Are my results stored?
Input and results stay in page memory. Download anything you want to keep.