The JSON formatter and validator makes your data readable with proper indentation, minifies it to a single line, and finds syntax errors. Everything runs right in your browser — the data is never sent anywhere, which matters when you work with configs and API responses.
How to use it
- Paste your JSON into the field above.
- Click "Format" for an indented structure, or "Minify" for a single line with no spaces.
- If the JSON has an error, the tool will tell you.
Why it's useful
- Readability. An API response or config on one line is hard to read — formatting breaks it out by level.
- Validation. Quickly find a stray comma or an unclosed bracket.
- Optimisation. Minified JSON weighs less — useful for transfer and storage.
Frequently asked questions
Is my data safe?
Yes. Processing happens in the browser; the JSON never leaves your device — safe to paste even sensitive data.
Why does it report an error?
JSON requires double quotes around keys and strings and forbids trailing commas and comments. The tool points to the problem spot — check your quotes and brackets.