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Home › JSON Formatter
JSON Formatter
Turn messy JSON into neatly indented text, validate it, or compress it. Your data never leaves the browser.
How to use
- Pick an indent option.
- Paste your JSON.
- Copy the formatted output.
Frequently asked questions
What does invalid JSON show?
An error message with the position of the problem, usually a missing quote or comma.
Do large files work?
Yes up to a few MB; it uses your browser’s memory.
How do I find an invalid JSON error?
The tool shows the error and its position. The usual causes are missing commas, single quotes and trailing commas.
Is my data sent to a server?
No. Formatting happens in your browser and the data never leaves your device.