JSON Formatter & Validator
Paste your JSON on the left, then click Format JSON or Minify JSON. Validation happens automatically in your browser — we do not upload your data.
Formatted / Minified JSON
Why use a JSON Formatter & Validator?
JSON is the backbone of modern APIs, configs, and data pipelines — but it quickly becomes hard to read when everything is on a single line. A JSON formatter helps you:
- Pretty-print compact or minified JSON from APIs and logs.
- Catch missing commas, quotes, or brackets instantly.
- Debug nested objects and arrays visually.
- Prepare clean JSON for documentation or code reviews.
The Dev Brains AI JSON tool keeps everything on the client side: paste, format, validate, and copy — without sending data to a server.
Tips for Working with JSON
- Ensure all keys are in quotes, e.g.,
"name": "Dev Brains". - Use commas between items, but not after the last item in an object or array.
- Booleans and null are written as
true,false,nullwithout quotes. - Remember that JSON does not support comments — remove
//or/* ... */.
For advanced debugging, you can combine this formatter with your browser DevTools or API clients like Postman and Insomnia.
FAQ: JSON Formatter & Validator
Is this JSON formatter free?
Yes — the JSON formatter and validator on Dev Brains AI is completely free to use in your browser.
Does my JSON get sent to your server?
No. Formatting and validation are performed in your browser using JavaScript. We do not send your JSON payloads to our server by default.
Can I use this for API responses or logs?
Yes. You can paste API responses, logs, or configuration files into the tool to quickly pretty-print, validate, and debug JSON.
What happens if my JSON is invalid?
You will see a clear error message indicating why parsing failed. Fix the issue and click Format again.
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Try our AI Regex Generator to build regex patterns from plain English, or AI SQL Generator to convert questions into SQL queries.