JSON schema validator

Validate JSON payloads against Draft 2020-12 schemas locally in your browser.

Runs locally in your browser. Payloads, schemas, expressions, and generated output stay on your device.

JSON Schema

JSON

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "required": ["account", "events"],
  "properties": {
    "account": {
      "type": "object",
      "required": ["id", "email"],
      "properties": {
        "id": { "type": "string" },
        "email": { "type": "string", "format": "email" }
      }
    },
    "events": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["type", "attempt"],
        "properties": {
          "type": { "type": "string" },
          "attempt": { "type": "integer" }
        }
      }
    }
  }
}

JSON payload

JSON

{
  "account": {
    "id": "acc_123",
    "email": "api@example.com"
  },
  "events": [
    { "type": "created", "attempt": 1 },
    { "type": "updated", "attempt": 2 }
  ]
}

Common uses

Check example API responses against a JSON Schema before they become contract tests.
Validate fixtures and mock payloads without sending sensitive samples to a server.
Catch type, required field, additional property, and standard format issues.

Details

Does schema validation upload my schema or payload?

No. Both the schema and payload are parsed and validated locally in your browser through the JSON worker.

Which JSON Schema draft does it support?

The validator supports Draft 2020-12 first, matching the schema generator output, with standard formats such as email enabled.

Private by default

The current tool runs in your browser. Payloads, schemas, expressions, and generated output are not sent to jsonpark.com, Supabase, Turnstile, or analytics.