JSON Validator
Check whether text is valid JSON and see the parser error if it is not.
Your input stays in your browser. Nothing is uploaded.
Valid JSON
Input
Output
About this tool
Validation uses JSON.parse only. A success badge means the text is legal JSON, not that the data is semantically correct for your API.
How it works
Paste JSON and read the status. Fix the reported position or token, then paste again.
JSON.parse(input)
Examples
Trailing comma
{"a": 1,} is invalid. Remove the comma after 1.
FAQ
Are comments allowed?
No. Standard JSON does not allow // or /* */ comments.
Is my data uploaded?
No. Formatting, encoding, and generation run in your browser.
Can I use this offline after the page loads?
Yes, as long as the page stays open. Nothing is sent to a SmartKitio API.