Developer Tools
JSON Validator
Find out whether your JSON has valid syntax.
Loading JSON Validator…
Free to use. No account needed. Your files and data stay in your browser.
How this tool works & helpful answers
How to use JSON Validator
- Paste the JSON you want to check.
- Select Validate JSON and read the result.
- If there is an error, correct the input and check it again.
JSON Validator: what to know
Syntax validation checks whether input follows the JSON grammar. It does not validate a business schema, verify that a URL exists, or decide whether the data is correct for your application. Duplicate keys are accepted and preserved by this tool, though applications may interpret repeated keys differently.
Useful features
- Local browser processing
- Clear input validation
- No account required
Frequently asked questions
Is this JSON Schema validation?
No. This tool checks JSON syntax. Use a schema validator when you need required fields and value-type constraints.
Is this tool free?
JSON Validator is free to use without an account. File and processing limits are displayed in the tool.