JSON Schema Validator Online

Validate your JSON documents against JSON Schema definitions using Ajv. Test data types, formats, required properties, and custom schemas locally in your browser with instant error diagnostics.

Ajv-Powered Validation Features

• Continuous Validation: Errors are highlighted in real time as you edit JSON or Schema.
• Exact Source Mapping: Error markers pinpoint line numbers, column numbers, and instancePath JSON pointers.
• Preset Schema Templates: Instantly load schemas for User Profiles, API Responses, GeoJSON, and Config Files.
• Format Checks: Validates email, uuid, date-time, ipv4, ipv6, hostname, and uri string formats.

Sample JSON Schema Definition

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "User",
  "type": "object",
  "properties": {
    "id": { "type": "string", "format": "uuid" },
    "username": { "type": "string", "minLength": 3 },
    "email": { "type": "string", "format": "email" },
    "role": { "type": "string", "enum": ["admin", "editor", "viewer"] }
  },
  "required": ["id", "username", "email"]
}