AkousaJSON Schema Validator
Validate JSON data against a JSON Schema definition.
About JSON Schema Validator
The JSON Schema Validator validates a JSON document against a JSON Schema definition (supporting drafts 4, 6, 7, 2019-09, and 2020-12) and reports all validation errors with the full JSON Pointer path, the violated keyword, the expected constraint, and the actual value that failed — giving actionable error messages rather than generic validation failed responses. JSON Schema is the de facto standard for defining the structure and constraints of JSON data in OpenAPI 3.x specifications, Kubernetes CRD validation, form validation, and configuration file contracts.
How to Use
Paste your JSON data into the left panel and the JSON Schema definition into the right panel, then click Validate. Select the JSON Schema draft version that your schema uses from the dropdown — the validator adjusts its rule interpretation accordingly. All validation errors appear below with the exact JSON Pointer path, the failing keyword (type, minimum, required, pattern), and what was expected vs what was received for each error.
Common Use Cases
- API developers testing OpenAPI 3.x request and response body schemas against real API payloads to verify the schema accurately constrains the data contract before publishing the API specification
- Kubernetes platform engineers validating CustomResourceDefinition schemas against example CR manifests to catch validation errors before applying them to a cluster
- Backend developers debugging schema validation failures in production by reproducing the exact failing JSON payload against the schema to understand which constraint the input violated
- Data pipeline engineers validating event schemas at pipeline entry points by testing incoming JSON events against the canonical schema to catch upstream data quality issues early
- Frontend form developers testing JSON Schema definitions used for ajv or Zod validation logic by iterating on the schema with real user input samples until all valid inputs pass and all invalid inputs fail correctly