JSON to Java
Generate Java DTOs and review validation-oriented API models.
JWT Generator
Create HS256 JWTs inside the browser for local testing
Enter a payload and secret to mint an HS256 JWT suitable for local dev servers and manual testing with Postman or curl.
How to use it
This is not a production issuer. Use it to mimic the claim shape returned by providers like Google, Auth0, or AWS Cognito while you are building the consumer.
Keys stay in the browser, but avoid pasting real production secrets. Replace them with a dummy key of the same length for experiments.
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.