A simple user object
{ "id": 1, "name": "Ada", "active": true }public class Root {
public int Id { get; set; }
public string Name { get; set; }
public bool Active { get; set; }
}JSON to Model Class
Generate C#, Java or Python model classes from a JSON sample.
Generated model
The result will appear here.
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About this tool
A backend that consumes an API response, or writes one, needs a typed class to deserialize into — a C# class for a .NET service, a Java POJO for a Spring app, a Python dataclass for a script. Writing that class by hand from a JSON sample is mechanical and easy to get subtly wrong (an int that should have been a double, a missed nested object).
How to use it
- Pick the target language: C#, Java or Python.
- Paste a JSON object or array — a real API response works best.
- Name the root class, then copy the generated model. Nested objects get their own class, named after the property they came from.
Examples
Common problems
- A field is typed as the wrong number type — I expected a decimal but got an int.
- The type is inferred from the one sample value you provided: 10 looks like an integer, 10.0 looks like a float. If a field can hold either in practice, widen the type by hand after generating.
- The Java output has no Lombok annotations or builder methods.
- The generated classes are plain POJOs with explicit getters and setters — a deliberate, dependency-free starting point you can adapt to your project's conventions (Lombok, records, etc.) afterward.