JSON to Java
Generate Java DTOs and review validation-oriented API models.
UUID
Generate UUID v4 batches for fixtures and event keys
Produce one or many UUID v4 values and copy them as newline or comma separated lists. Useful for fixtures, Kafka message keys, and idempotency key drafts.
Why UUID v4
UUID v4 packs 122 random bits into a 128-bit identifier, making collisions effectively impossible. Unlike v1 and v2 it does not leak a MAC address or a timestamp, and it needs no coordinator to be issued in distributed systems.
If you need time-ordered ids for index locality, reach for UUID v7 with a dedicated library. This tool only covers v4.
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.