Best JSON Schema Validator – Validate Your JSON Instantly

JSON Input

JSON Schema

Why Use a JSON Schema Validator?

This tool helps developers and QA engineers confirm that JSON responses conform to a required schema structure before shipping or integrating APIs. It prevents bugs and data mismatches in real-world applications.

🔍 Common Use Cases:

Validating API responses in frontend/backend development
Ensuring configuration files match a known schema
Verifying webhook payloads from third-party services
Unit testing structured data objects

✅ Example – Object:

JSON:
{ "id": 101, "active": true }

Schema:
{
  "type": "object",
  "properties": {
    "id": { "type": "number" },
    "active": { "type": "boolean" }
  },
  "required": ["id", "active"]
}

✅ Example – Array:

JSON:
["apple", "banana", "cherry"]

Schema:
{
  "type": "array",
  "items": { "type": "string" }
}

✅ Example – Single Element:

JSON:
42

Schema:
{
  "type": "number"
}

Use this validator anytime you want to quickly test structured data against expectations. It runs entirely in your browser – no server interaction required.