JSON Validator
Check whether your JSON is valid and see the exact error if not. Local, free, no signup.
Scan to open on your phone
Point your phone camera at the code to open this tool.
Check whether your JSON is valid and see the exact error if not. Local, free, no signup.
How to use JSON Validator
- Paste or type your contentThe result appears as you type — there is no submit button.
- Read and copy the resultThe output updates live and the copy button takes it in one click.
Worked example
- {"valid": true}
- Valid JSON
Nothing you enter leaves your device
All of the work happens inside your browser. Whatever you type is never packaged up and sent to a server, and no request this page makes carries it.
That makes it safe for contract amounts, personal details and internal documents you would rather not hand to a third party — close the tab and it is gone.
What this tool does not do
JSON Validator only does what a browser can do on its own — it talks to no backend service. So it keeps no history for you and syncs nothing across devices; if you need a record, copy or download the result.
It is also not a substitute for professional judgement. For legal, medical or tax decisions, treat the output as a starting point rather than a final answer.
Frequently Asked Questions
- What does it report?
- A simple Valid JSON message, or the parser error with its reason.
- Does it fix the JSON?
- No, it only validates; use the formatter to pretty-print a valid document.