Debugging API responses
Paste a raw response, instantly see the structure.
Free JSON Formatter & Validator — Browser-based
Paste raw JSON, get instant formatting with syntax highlighting and error detection. Sort keys, minify, or pretty-print at any indent level.
No signup Nothing uploaded No watermarks
Why use it
What you get.
Real-time syntax validation with error line numbers
Sort keys alphabetically or preserve order
Minify or pretty-print at 2/4 spaces
Find duplicate keys
Your data never leaves your browser
Step by step
How it works
No manual required — but here's the whole flow, start to finish.
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Paste your JSON into the input
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Click Format (pretty) or Minify (single-line)
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See parse errors with exact line numbers
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Click Copy to grab the cleaned output
Use cases
Who reaches for this.
Cleaning config files
Standardize indentation and key order across teams.
CSV ↔ JSON conversion
Pipe through the related CSV-JSON tool for round-trips.
Bug reports
Minify a JSON payload to share in a ticket without 200 lines.
FAQ
Questions, answered.
Is there a size limit?
Only your browser's memory. JSON files up to ~50 MB format fine on modern devices.
Does it handle JSON5 / JSON with comments?
No, this is strict JSON only. Use a JSON5 parser for relaxed syntax.
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