Format search tool
JSON validator
A missing quote, trailing comma, or comment can break JSON parsing. Paste a payload to validate it and see a browser parser error when the input is invalid.
Examples for this search
Find trailing commas in API examples.
Check whether config snippets are valid JSON.
Validate webhook payloads before using them in tests.
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.
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
{"status":"ok","count":2}
[{"id":1},{"id":2}]
{"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.
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.