What this tool does
This JSON formatter is built for everyday debugging work. Paste an API response, a config file or a minified payload and you can pretty-print it, validate it and switch back to a compact version in seconds.
- Formats raw or minified JSON into readable, consistently indented output.
- Validates the input immediately so broken commas, quotes or braces surface before you paste the payload somewhere else.
- Helps developers inspect nested API responses, environment configs and sample fixtures without relying on online paste tools.
How to use it
- 1
Paste raw JSON into the input editor.
- 2
Use Format when you need a readable structure for debugging or code review.
- 3
Use Minify when you need a compact payload for tests, mocks or transport.
- 4
Copy the cleaned output and paste it into your app, docs or API client.
Example
A minified API payload becomes readable before you inspect nested fields.
{"user":{"id":42,"roles":["admin","editor"]},"active":true}{
"user": {
"id": 42,
"roles": ["admin", "editor"]
},
"active": true
}Use cases
- Inspecting REST or GraphQL responses during backend and frontend debugging.
- Validating package.json, mock fixtures or seed data before committing changes.
- Minifying JSON payloads for tests, demos or transport over constrained channels.
Common mistakes
Pasting JavaScript instead of JSON
Trailing commas, comments, unquoted keys and single quotes are valid in JavaScript objects but invalid in strict JSON.
Assuming formatting also sanitises data
Pretty output improves readability, but it does not remove secrets, PII or broken field names from the payload.
Using the formatted output as a schema
Readable JSON is still sample data. It does not replace a JSON Schema or API contract.
FAQ
Does this formatter send my JSON anywhere?
No. Formatting and validation run entirely in the browser, which is helpful when you are debugging internal APIs or sensitive payloads.
Can it validate comments or JSONC?
No. It is intentionally strict and validates standard JSON only, which matches what most APIs and parsers expect in production.
Can I use it for large payloads?
Yes, but very large files depend on the memory and performance of the current device because processing stays local.
Does formatting change the JSON values?
No. It only changes whitespace and layout unless you explicitly choose to minify the same valid content.
When should I minify JSON?
Minify when you need a compact payload for network transfer, fixtures or inline examples. Keep formatted JSON when humans need to read it.
Privacy and security
- JSON is processed locally in your browser.
- No payload is uploaded for formatting or validation.
- This is safer than pasting internal API responses into third-party web tools.
Related tools
Related tools for the next step in the same workflow:
Next step
Format your next payload locally, then jump to XML, YAML or data conversion tools when the response format changes.