JSON Formatter & Validator Pro
Make unreadable JSON readable, find out exactly where it is broken, and get it back out in the shape you need. Free preview · Pro required to export. Format, minify and inspect up to 3,000 characters of JSON free. Pro removes this limit and adds downloads.
Free preview · Pro required to export. Format, minify and inspect up to 3,000 characters of JSON free. Pro removes this limit and adds downloads.
Why use this tool?
- An API response on one line is unreadable; indented, the structure is obvious.
- A parser error with a character offset is not much help — seeing the invalid position highlighted is.
- Turning a response into a CSV or a TypeScript interface saves writing either by hand.
How to use JSON Formatter
- Paste your JSON.
- Beautify to read it, or minify to ship it.
- If it is invalid, the error points at the position; the repair pass fixes the common causes.
- Export as paths, CSV or TypeScript interfaces if you need them.
Features
- Beautify with configurable indentation, and minify
- Validation with the failing position identified
- Repair for trailing commas, single quotes and unquoted keys
- Export to dotted paths, CSV or TypeScript interfaces
Frequently asked questions
Is my JSON sent to a server?
No. Parsing, formatting and validation all happen in your browser, which matters given how often JSON being debugged contains tokens or customer data.
Why is my JSON invalid when it looks fine?
Usually a trailing comma, single quotes instead of double, or an unquoted key. All three are legal in JavaScript and illegal in JSON.
Can I try this Pro tool without an account?
Yes. Format, minify and inspect up to 3,000 characters of JSON free. Pro removes this limit and adds downloads. Your own input is processed locally in your browser.
Will upgrading keep my work?
Checkout and login open in a separate tab. Keep the workspace open to retain inputs, settings and previews. Files stay in that tab only; keep the originals in case you close or reload it. Export access is checked with the server after payment.
Your files are processed directly in your browser and are not uploaded to HubToolify's servers.