JSON Formatter & Validator
FreePaste JSON to format it for readability, minify it for compact output or validate its syntax directly in your browser.
Related tools
Other utilities you may need.
How to use JSON Formatter & Validator
Paste JSON, then format or minify. Validation errors are shown inline. Nothing is uploaded.
Understanding the results
Valid JSON can be formatted or minified. Invalid JSON shows a parse error so you can fix it.
Limitations
- Very large payloads may be limited by browser memory.
- This validates JSON syntax, not a specific schema unless you add one yourself.
Privacy note
JSON processing for the core tool runs locally in your browser.
Frequently asked questions
Is my JSON uploaded?
No. The core formatter and validator run in your browser.
What errors can the validator detect?
Syntax errors such as missing commas, unquoted keys and invalid structure.
Can I minify formatted JSON?
Yes. You can format for readability or minify for compact output.
Do I need an account?
No account is required for free tools on this site.