Format JSON — Pretty Print, Local
Parse JSON and display it with indentation or compact spacing. This helps inspect configuration data while keeping the operation separate from executing JavaScript or repairing an invalid document.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
Numbers stay on your device. Nothing is sent to a server.
How to use this tool
Enter valid JSON with double-quoted keys and strings. Comments and trailing commas belong to other syntaxes and are not accepted as JSON, even if they work in a JavaScript object literal.
Results and examples
Formatting {"count":2,"ok":true} places the properties on readable lines while keeping their ordinary values. Compact output removes spacing but is not a guaranteed canonical form for digital signatures.
Limitations
- Numbers beyond the JavaScript safe-integer range may lose precision during parsing.
- Duplicate property names may collapse to the final value, so retain the original for comparison.
Fields
| Field | Guidance and constraints |
|---|---|
| JSON | Check the unit and format displayed beside this field. |
| Output | Pretty-print / Minify |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
Does formatting change the data?
Formatting {"count":2,"ok":true} places the properties on readable lines while keeping their ordinary values. Compact output removes spacing but is not a guaranteed canonical form for digital signatures.
Are very large integers preserved?
Numbers beyond the JavaScript safe-integer range may lose precision during parsing. Duplicate property names may collapse to the final value, so retain the original for comparison.
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