Convert Scala case classes into JSON Schema and use the Mock Generator shortcut to create matching sample JSON.
Select which case class should be treated as the JSON Schema root.
Parsing runs entirely in your browser. Your source never leaves the page.
Paste your Scala case classes to produce JSON Schema instantly.
Supports Option[T], collections, maps, nested case classes, and default values.
This online Scala case class to JSON Schema converter helps you generate JSON Schema from real models (DTOs, structs, and classes) so you can validate payloads, share contracts, and generate mock JSON.
Step 1 – Paste your Scala source
Step 2 – Select the Root type (if needed)
Step 3 – Review the JSON Schema output
definitions and $ref when your models reference other models.Step 4 – Validate or generate mock JSON
anyOf/oneOf/allOf), verify the result with a full validator like Ajv.Schema keyword support note
Generated schemas can include $ref and may be edited to include anyOf, oneOf, or allOf. For complex schemas, use a full JSON Schema validator and dereference before mock generation if needed.
Use these tools to validate schemas, generate mock payloads, format JSON examples, and keep code and contracts in sync.
Generate example JSON from your schema for testing, fixtures, and documentation.
Validate JSON against common schema keywords and find mismatches quickly.
Generate Scala types and models from JSON samples.
Build schema from representative JSON samples to complement model-first schemas.
Explore schema examples and patterns for objects, arrays, enums, and constraints.
Clean up JSON examples before validating against schema or sharing docs.
The converter reads case classes and regular classes with constructor parameters. It handles Option[T], collections (List/Seq/Vector/Array/Set), maps, default values, and basic primitive types. Nested case classes are supported as long as they appear in the same snippet.
Primitive types (String, Int, Long, Double, Boolean, BigDecimal, Instant, UUID, etc.) map to JSON Schema primitives with formats. Collections become arrays, maps become objects, and Option[T] marks fields as optional. Unknown types fall back to strings unless another case class with that name exists.
Yes. As long as the class definition follows the standard case class syntax, the tool will parse it. The conversion happens entirely in your browser, so your source code remains private.
After generating the schema, click "Generate Mock Data" to open the Mock Generator with the schema preloaded. Configure locales, array sizes, and optional fields to create sample payloads instantly.