JSON to C# Class Generator
Turn any JSON payload into strongly-typed C# classes with System.Text.Json attributes — perfect for .NET APIs.
What is the JSON to C# Class Generator?
The JSON to C# Class Generator converts a JSON document into strongly-typed C# model classes. It walks the JSON tree, detects nested objects and arrays, and emits one class per type with properties matching the JSON keys — ready to paste into your .NET solution.
A representative sample lets the generator infer primitive property types, collections and nested models. Naming and serializer-attribute options reduce repetitive setup when consuming a new endpoint with System.Text.Json or Newtonsoft.Json.
Generation happens in the browser, which matters when the sample payload comes from a private endpoint.
How to use the JSON to C# Class Generator
- 1Paste a representative JSON sample into the input area.
- 2Set the root class name (for example, "OrderResponse").
- 3Pick options: PascalCase properties, System.Text.Json or Newtonsoft.Json attributes.
- 4Click "Generate" and copy the produced classes into your solution.
When to use the JSON to C# Class Generator
- Create response DTOs while integrating a documented REST endpoint into a .NET application.
- Turn a saved webhook example into typed models for a handler and its tests.
- Generate nested classes from a complex configuration sample before adding validation.
- Compare inferred types across multiple API examples to find optional or inconsistent fields.
Key features
- Detects nested objects, arrays, dates and primitives
- Optional serializer attributes for System.Text.Json or Newtonsoft.Json
- Configurable naming conventions
- Output compatible with .NET 6 and newer
Important notes
- Generation is local and does not upload the sample, but remove real credentials and personal data before saving generated code or sharing screenshots.
Frequently asked questions
Can I generate records instead of classes?
Currently only classes are generated.
Does it handle polymorphic JSON?
Not automatically — polymorphic types usually need a hand-written converter.
Why should I use a representative sample?
Inference only sees values present in the sample. Include examples of nested objects, arrays, nulls and optional variants, then review the resulting nullable and numeric types.
Should generated classes be used without review?
No. Check names, nullability, integer ranges, date handling and required fields against the API contract before relying on them in production.
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