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JSON Formatter
Format and validate JSON payloads for APIs, config files, and test fixtures.
Output
Ready
Type
-
Lines
0
Chars
0
When to use this tool
Use this JSON formatter when reviewing API responses, preparing test payloads, or cleaning config files.
You can validate and normalize structure quickly before shipping data changes.
Frequently asked questions
Does this JSON formatter validate malformed input?
Yes. The tool reports parse errors with helpful messages when the JSON input is invalid.
Can I sort keys recursively?
Yes. Enable key sorting to normalize object key order across nested structures.
Can I switch between pretty and minified JSON?
Yes. Toggle minify mode for compact output or use indentation for readable JSON.
Related tools
JSON formatter and validator online for API payload debugging
Use this JSON formatter and validator online to pretty-print API responses, detect malformed JSON, and minify payloads for transport.
Recursive key sorting helps keep snapshots stable in tests, code review diffs, and contract validation workflows.
Common production use cases
- Format API response bodies for easier debugging.
- Validate pasted JSON before sending requests.
- Minify payloads for benchmark and transport checks.
- Normalize object key order in fixture files.