JSON Swiss

JSON Swiss

JSON To Scala Generator

Need to convert Scala into JSON Schema?

Scala Case Class → JSON Schema

JSON Input

Loading editor…

Generated Scala

Configuration

Enter JSON data to generate Scala case classes

Immutable case classes with framework support

How to convert JSON to Scala – step-by-step guide

Use this JSON to Scala generator to create Scala case classes from JSON samples for JVM services and data pipelines.

  1. Step 1 – Paste a JSON sample

    • Paste a representative JSON object or array into the left editor.
    • Include nested objects, arrays, and nullable fields so types are inferred correctly.
    • Use Import to load JSON from a file, URL, or sample data.

  2. Step 2 – Choose Scala model options

    • Set a root Class Name for the generated case class.
    • Decide how optional fields are represented (for example Option[String]).
    • Confirm how nested objects and arrays map to nested case classes and List/Seq.

  3. Step 3 – Review the generated code

    • Check field names, types, and how arrays/objects are modeled.
    • Adjust options like Root Type Name, null handling, and frameworks if available.
    • If a field is inferred incorrectly, tweak your sample JSON and regenerate.

  4. Step 4 – Use the case classes in Scala

    • Paste the case classes into your project sources.
    • Deserialize JSON into your models using your preferred JSON library.
    • Add validation for required fields where your business logic depends on them.

  5. Step 5 – Copy or download

    • Copy the output into your project or download it as a file.
    • Run your formatter/linter to match your code style.
    • Add JSON parsing/serialization libraries if your language requires them.

Quick tips

  • Prefer Option for missing/null fields instead of sentinel values.
  • Keep models aligned with your API contracts to avoid runtime mismatches.
  • Generate a JSON Schema when you need shared contracts across services.
Example output (simplified)
// JSON input
{
  "id": 123,
  "name": "Maeve Winters",
  "email": "maeve@example.com",
  "active": true,
  "roles": ["admin", "editor"],
  "metadata": { "plan": "pro" },
  "createdAt": "2024-03-01T10:15:00Z",
  "score": 99.5,
  "notes": null
}

// Generated Scala models (simplified)
final case class Metadata(plan: String)

final case class Root(
  id: Long,
  name: String,
  email: Option[String],
  active: Boolean,
  roles: List[String],
  metadata: Metadata,
  createdAt: String,
  score: Double,
  notes: Option[Any]
)

Related JSON & Scala tools

Explore more JSON and schema tools that work great alongside this JSON to Scala generator.

Scala Class to JSON & JSON Schema

Convert existing Scala classes into JSON examples and JSON Schema for docs and validation.

JSON Schema Generator

Generate a JSON Schema from JSON samples to validate payloads and contracts.

JSON Formatter & Validator

Format and validate JSON before generating models to avoid runtime issues.

JSON to Java Generator

Generate Java POJOs for mixed JVM ecosystems.

Frequently Asked Questions

What Scala features are supported?

The generator creates Scala case classes with immutable fields, supports Circe and Play JSON frameworks for serialization, and follows Scala naming conventions with proper package structure.

Can I generate Circe-compatible classes?

Yes! Select 'Circe' as the framework to generate case classes with automatic JSON codec derivation using Circe's generic semi-automatic derivation.

How does Play JSON integration work?

When Play JSON framework is selected, the generator adds implicit Format instances for automatic JSON serialization/deserialization with Play Framework.

What about immutability and functional programming?

Generated Scala case classes are immutable by default, support pattern matching, and include automatic equals/hashCode/toString methods following functional programming principles.

JSON to Scala Class Generator Online | JSONSwiss