Generate sample JSON data from an Avro schema. Auto-generates values based on field types. Code never leaves your device — formatting and validation run locally in your browser.
Content reviewed October 2026 · About Toolzum
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It reads an Apache Avro schema and generates realistic sample JSON data based on field types. String fields get sample text, numbers get realistic values, enums get random options, and arrays get populated entries.
You can generate 1 to 1000 sample records in a single batch. Each record conforms to the Avro schema structure with type-appropriate values.
Yes. Union types (nullable fields) are handled correctly — null values appear with realistic frequency, and non-null values match the expected type.
Yes. Generate sample records that match your Avro schema and feed them into a Kafka test consumer to validate deserialization and processing logic.
No. All generation happens locally in your browser. No schema or sample data is sent to any server.
Avro Schema Generator
Generate Apache Avro schemas from a JSON field definition. Configure namespace, record name, and field types — outputs valid Avro schema JSON.
JSON Schema Generator
Generate JSON Schema from sample JSON — types, required fields, and nested structure inferred automatically in seconds flat.