JSON to Java
Generate Java DTOs and review validation-oriented API models.
Avro Message
Generate example payloads from an Avro schema
Paste an Avro record schema to produce a JSON message with nested records and enums populated. Useful for Kafka smoke tests and contract fixtures.
How the sample is built
- Primitive fields use sane defaults for their type
- Enum fields use the first symbol
- Unions pick the first non-null branch
- Arrays get one recursively generated element
What to add next
The generated message is a good starting fixture. Extend it with edge cases — empty arrays, null branches, boundary numbers — before shipping it into regression tests.
Pairs well with
Jump to other JSON2Class utilities that naturally follow this one.
JSON to Kotlin
Review nullability and Kotlin data class structure quickly.
JSON to TypeScript
Turn API payloads into TypeScript interfaces for frontend work.
JSON Formatter
Format sample payloads before sending them back into the converter.