JSON Swiss

JSON Swiss

JSON To Groovy Generator

JSON Input

Loading editor…

Generated Groovy

Configuration

Enter JSON data to generate Groovy code

Dynamic and flexible classes

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

Use this JSON to Groovy generator to create Groovy classes from JSON samples for JVM apps, scripts, and services.

  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 Groovy class options

    • Pick a root Class Name that matches your model.
    • Decide whether you prefer plain properties or Groovy-style @Canonical data classes.
    • Review how nested objects become nested classes for reuse and clarity.

  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 classes in Groovy/JVM

    • Add the generated classes to your project sources.
    • Parse JSON and map it into your models using your preferred JSON library.
    • Keep models aligned with your API contract to avoid runtime surprises.

  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

  • Use strong typing for public APIs, even if Groovy is dynamic-friendly.
  • Prefer separate types for nested objects instead of Map when possible.
  • Validate input early in pipelines and scripts.
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 Groovy classes (simplified)
class Metadata {
  String plan
}

class Root {
  Integer id
  String name
  String email
  Boolean active
  List<String> roles
  Metadata metadata
  String createdAt
  BigDecimal score
  Object notes
}

Related JSON & Groovy tools

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

JSON to Java Generator

Generate Java POJOs when you need interop across Groovy and Java codebases.

JSON Schema Generator

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

JSON Formatter & Validator

Format and validate JSON before generating Groovy classes to avoid runtime issues.

Java Class to JSON & JSON Schema

Convert JVM models into JSON examples and JSON Schema for docs and validation.

Frequently Asked Questions

What Groovy features are supported?

The generator creates Groovy classes with dynamic properties, supports @Canonical transform for automatic equals/hashCode/toString, and follows Groovy's flexible typing conventions.

Can I generate classes with @Canonical transform?

Yes! Select 'Canonical' as the framework to generate classes with @Canonical annotation, which automatically provides equals, hashCode, toString, and constructor methods.

How does dynamic typing work?

Groovy supports both dynamic and static typing. You can choose to generate classes with explicit type declarations or use Groovy's dynamic 'def' keyword for flexible runtime typing.

What about Groovy's concise syntax?

Generated Groovy code leverages Groovy's concise syntax with automatic property generation, optional parentheses, and simplified class definitions for readable, maintainable code.

JSON to Groovy Class Generator Online | JSONSwiss