JSON formatter
Validate, explore and repair without losing large integers.
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Input JSON
Result
Large integers retain their original digits. Array order matters; object key order does not. Files stay in your browser; inputs are not autosaved.
How to use, privacy & sources
How to use & assumptions
01 / Paste text or import a file. Validation errors include line and column; duplicate fields are reported separately.
02 / Repairs require preview and explicit application. The tree includes field paths, and exports retain large integer digits.
Privacy and results
Files and inputs are processed in this browser, without sending them to our servers. Saving scenarios is explicit and stores them on this device; clear site data on shared devices.