About JSON Schema Validator

Validates JSON data against a JSON Schema (Draft-07 syntax) with a custom client-side validator. Checks type constraints (string, integer, number, boolean, object, array), required properties, minimum/maximum for integers, minLength for strings, email format validation, array item schemas, and minItems. Three example schemas—User, Product, and Array—demonstrate nested objects, enums, and pattern constraints. Validation errors report the exact property path, failed keyword, and a human-readable message.

• Supports type, required, minimum, maximum, minLength, format (email), items, and minItems keywords
• Error reports include JSON path (e.g., profile.age), failed keyword, and schema path
• Three built-in examples: User schema with nested profile, Product schema with dimensions, Array schema with minItems
• Export validation report as JSON including schema, data, and all errors

Frequently Asked Questions

Does this support the full JSON Schema specification?

No—it implements a practical subset: type checking, required, min/max, minLength, email format, array items, and minItems. Advanced features like $ref, oneOf, anyOf, allOf, if/then/else, and pattern are not supported. For full spec compliance, use a library like Ajv.

Which JSON Schema draft versions are supported?

The validator supports Draft-04, Draft-06, Draft-07, and Draft 2019-09 (also known as Draft-08). It auto-detects the draft from the $schema keyword in your schema document. If no $schema is specified, it defaults to Draft-07.