Does valid JSON mean the data is correct?

No. Validation only checks syntax. Required fields and types are a separate concern.

Developer Tools

JSON Validator

Check whether a JSON document is valid and see a precise parse error if it is not.

JSON

Paste JSON and validate it. A successful parse confirms the document. If parsing fails, the native error message is shown so you can fix the syntax.

Missing a comma after {"ok": true "name": "Ada"} is invalid. Adding the comma makes it valid.

Percent of, change, and difference.

Exact age, totals, and next birthday.

Estimate investment growth over time.

Monthly payment and amortization summary.