JSON Schema Validator - Validate JSON Against Schema

Validate JSON data against JSON Schema. Supports draft-07, draft-2019-09, and draft-2020-12. Detailed error messages. Free and private.

JSON Schema

JSON Data

Validation Options

Schema Version:

Show all errors

Frequently Asked Questions

Draft-07 (most common), draft-2019-09, and draft-2020-12. Select the version that matches your schema.

Visit json-schema.org for documentation. JSON Schema defines the structure, types, and validation rules for JSON data.

Yes. JSON Schema supports nested objects, arrays, references ($ref), and complex validation patterns.

Yes. All validation happens in your browser using JavaScript. No data is sent to any server.

Errors include the field path, expected type/format, actual value, and which schema rule was violated.

Type validation, required fields, enums, patterns, min/max values, array validation, oneOf/anyOf/allOf, and custom formats.

Yes. External $ref references to other schemas and internal $ref pointers within the same schema are fully supported.

Common formats like email, uri, date-time, ipv4, ipv6, and uuid are validated. Custom formats can be added programmatically.

Define an object with type, properties, required fields, and constraints. See JSON Schema documentation for complete syntax.

Yes. Use this to validate API payloads against your API's schema definition before making requests or in automated tests.