Format tool
JSON Formatter
Paste compact JSON from an API response, config file, webhook, or log line and turn it into readable formatted JSON.
Raw JSON
Formatted JSON
Runs in your browser
Tool guide
What this json formatter does
Use this JSON formatter when an API response, webhook body, config object, or log payload is too compact to scan. Paste raw JSON to validate it and turn it into indented, readable output.
Common use cases
- Format compact API responses while debugging.
- Validate webhook payloads before sharing them in an issue or support thread.
- Inspect JSON config snippets, feature flags, and structured logs.
- Copy readable JSON into docs, GitHub comments, or incident notes.
Accepted input formats
Object
{"status":"ok","count":2}
Array
[{"id":1},{"id":2}]
Nested payload
{"event":{"type":"signup","user":{"id":123}}}
How it works
The formatter uses the browser JSON parser. Valid JSON is reprinted with two-space indentation. Invalid JSON shows the parser error so you can find the problem quickly.
Common mistakes
- JSON does not allow trailing commas after the last item in an object or array.
- Object keys and string values must use double quotes, not single quotes.
- Comments are not valid JSON, even though some config formats allow them.
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FAQ
Frequently asked questions
Is this also a JSON validator?
Yes. If parsing fails, Toolvert shows the JSON error instead of formatted output.
Does Toolvert upload my JSON?
No. Formatting and validation run locally in your browser.
Can I format JSON arrays?
Yes. Objects, arrays, strings, numbers, booleans, and null are all valid JSON values.