Avro Schema Validator Online & JSON Converter

Validate Apache Avro record schemas, verify JSON payloads against Avro schema definitions, and convert Avro types to standard JSON Schema Draft format locally in your browser.

Open Avro & JSON Schema Tool →

Sample Avro Record Schema

{
  "type": "record",
  "name": "UserEvent",
  "namespace": "com.example.events",
  "fields": [
    { "name": "eventId", "type": "string" },
    { "name": "timestamp", "type": "long" },
    { "name": "userId", "type": ["null", "string"], "default": null }
  ]
}

Avro Record Validation

Check Avro JSON schema syntax, fields, namespaces, and union default types.

JSON Schema Mapping

Load Avro-to-JSON schema preset templates with one click in the Schema panel.

Fast & Local

All validation happens client-side without sending event schemas to external servers.

Frequently Asked Questions

What is Apache Avro schema validation?

Apache Avro uses JSON to define record schemas (fields, types, defaults, unions). Avro schema validation verifies that event records adhere strictly to the declared fields before serializing or sending to Kafka or data stores.

Can I convert an Avro schema to JSON Schema?

Yes. JSON OS includes preset templates to map Avro primitive types (string, long, double, boolean) and record fields into standard JSON Schema Draft properties.