API Debugging
Make responses from Postman, browser devtools or logs readable before sharing them with a team.
JSON · API Utility
JSON Formatter & Validator
Check API responses, minified configs or debug payloads directly in the browser. Format JSON cleanly, minify it for transport and sort keys for more stable diffs.
- Syntax checks without upload
- Pretty print, minify and key sorting
- Useful for APIs, logs and config files
Paste responses, configs or exported datasets.
The tool validates locally with the browser’s native JSON parser.
What this tool is good at
Fast API checks, readable diffs in config files and compact JSON output for transport or logging.
Browser-only
No server round-trips, no uploads, no hidden backend parsing.
Diff-freundlich
Key sorting helps with reviews, snapshots and reproducible exports.
Formatted, minified or sorted for copy and paste.
You can keep editing the output, check it again or swap it back.
Live metrics
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characters in input
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characters in output
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lines in output
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top-level items or keys
When this is useful
Config Reviews
Export JSON configs with sorted keys so diffs stay stable and reviews contain less noise.
Deploy & Transport
Minify with one click when JSON needs to be compact for headers, environment variables or pipelines.
Quick guide
- Paste JSON or use the sample button.
- Format it for readability or minify it for transport.
- Sort keys when you need clean diffs and reproducible order.
- Copy the output or swap fields to move it back into the input.
Error messages include an approximate position when the browser provides one.
Frequently Asked Questions
Are my data stored?
No. Every step runs locally in the browser. The tool does not send JSON data to the server.
Does the tool support nested objects and arrays?
Yes. Formatting, minifying and key sorting also work with deeply nested JSON structures.
What happens with invalid JSON?
The output stays unchanged or empty and you get a hint with the browser error text or the position of the problem.
Is key order always relevant?
Semantically, usually not. For reviews, snapshots or deterministic exports, a stable order is often very useful.
Cedric Scheumann