Question 1

What happens if my JSON is invalid?

Accepted Answer

The tool shows the exact position and description of the error so you can fix it quickly.

Question 2

Are comments supported in JSON?

Accepted Answer

No, the JSON standard doesn't support comments — use JSON5 or JSONC for that.

Question 3

Does it check against a schema?

Accepted Answer

No, it only checks that the syntax is valid JSON, not that it matches a specific schema.

Question 4

Is my data uploaded anywhere?

Accepted Answer

No, validation runs entirely in your browser.

Question 5

Can it validate very large JSON files?

Accepted Answer

Yes, though extremely large documents may take a moment to parse depending on your device.

JSON Validator

How to use it