JSON Validator

Free online JSON validator to check JSON format validity and spot parsing errors quickly.

  • Runs locally in your browser
  • No data uploaded
  • Instant processing
Waiting for input

How to Use JSON Validator

  1. Paste your JSON data into the input box.
  2. The validator checks JSON syntax instantly in your browser.
  3. Review the success state or parsing error details in the output panel.

Example Usage

Input

{"user":{"name":"Alice","age":30}}

Output

Valid JSON ✅
Top-level type: object
Size: 34 characters

Frequently Asked Questions

Does this JSON validator upload my data?
No. Validation runs fully client-side in your browser, so your JSON stays on your device.
Can I validate JSON arrays and nested objects?
Yes. The tool validates any valid JSON structure, including arrays, nested objects, strings, numbers, booleans, and null.
What happens when JSON is invalid?
The output shows an invalid status and a parser error message to help you fix the syntax quickly.