Validate an API response
Paste a JSON response and a schema to check required fields, types, array items, and additional property rules before wiring the payload into code.
Developer tools
JSON Schema Validator
Validate JSON against a JSON Schema and inspect paths, keywords, and error messages in the browser.
Validation result
JSON matches the schema.
Status
Valid
Errors
No validation errors.
Parsed JSON preview
{
"id": 42,
"name": "UtilPilot",
"tags": [
"json",
"schema",
"tools"
],
"published": true
}More developer tools
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About JSON Schema validation
JSON Schema describes the expected shape, required fields, value types, and constraints for JSON data. This validator checks a JSON sample against a schema and reports clear validation errors.
Common uses
- Validate API response examples
- Check config files before sharing them
- Debug required fields and type mismatches
- Review schema paths and failed keywords
Notes
Validation runs locally in the browser using AJV. Unknown custom formats are ignored unless they are expressed with standard JSON Schema constraints.
Examples
Debug schema errors
Use error paths, failed keywords, and parameter details to understand why a JSON sample does not match the expected schema.
FAQ
Does this JSON Schema validator upload my data?ShowHide
No. JSON parsing and schema validation run in your browser, so pasted data is not sent to the server.
Which schema draft does it support?ShowHide
The validator uses AJV with common JSON Schema behavior suitable for Draft 7 style schemas and many modern constraints.
Why are custom formats not checked?ShowHide
Custom formats need extra validators. This tool focuses on standard structural constraints such as type, required, enum, minimum, pattern, and array rules.
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