JSON Formatter
Popular Free Local ProcessingFree online JSON formatter. Pretty-print with clean indentation or compress the output, with key sorting, tolerant repair (auto-removing trailing commas and fixing common errors), and syntax validation. Ideal for API debugging and keeping config files tidy. Content is never uploaded — everything runs in your browser.
Options
How to Use
- 1 Paste the JSON you want to process
- 2 Choose the output mode (format / minify) and the indent width
- 3 Enable sorting and tolerant repair as needed
- 4 Click "Process JSON" and copy the result
FAQ
Q: What happens to invalid JSON?
With tolerant repair enabled, common issues are fixed first (trailing commas, misquoted quotes etc.). If it still fails, a specific error message is shown — it will never silently return wrong output.
Q: Does sorting change my data?
Only the key order of objects is adjusted; values and structure remain completely unchanged.
Q: Can it handle very large JSON?
Anything within reasonable browser memory works fine; for very large JSON, use the minify mode to keep the result smaller.
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