JSON Validator

How to use this tool

1. Enter or paste your input, or load the included example.
2. Adjust the available settings, then run the tool.
3. Review the result and copy or download it.

Try this example

{"name":"FeuTex","tools":["JSON","CSV"],"active":true}

Accuracy and scope

Checks standard JSON, not JSON5 or JSON Schema. JavaScript numbers may lose precision above 2^53−1. Duplicate object keys retain their last value.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.