JSON to C# Class Converter
Free online JSON to C# converter. 100% client-side.
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What is JSON to C# Class Converter?
The JSON to C# Class Converter is a free browser tool that turns JSON samples into C# model classes for .NET applications. It infers primitive values, nested objects, arrays, and collection types, converts names to PascalCase, and can add System.Text.Json JsonPropertyName attributes plus nullable reference annotations. Everything runs locally in your browser.
Key Benefits
- Create a useful C# model starting point from an API response in seconds
- Preserve exact JSON field names with optional JsonPropertyName attributes
- Generate nested classes and List types from realistic JSON structures
- Choose a root class name and nullable reference style for your project
- Keep private payloads on your device with fully client-side processing
Common Use Cases
- •Generate .NET API response models from sample REST or GraphQL payloads
- •Create DTO and configuration classes from JSON fixtures
- •Prototype C# models before adding them to an ASP.NET Core project
- •Convert JSON examples in API documentation into starter classes
- •Teach JSON-to-type mapping and System.Text.Json property naming
How to Convert JSON to C# Classes
- Paste JSON: Paste a valid JSON object or array into the input panel. The converter accepts API responses, fixtures, and configuration samples.
- Choose options: Set the root class name, then choose whether to include JsonPropertyName attributes and nullable reference types.
- Review generated classes: Inspect the live C# output. Nested objects become classes, arrays become List types, and JSON keys are converted to PascalCase.
- Copy or download: Click Copy to use the code immediately or Download to save the generated model as a .cs file.
Key Features
- Generate C# classes and properties from JSON samples with live output.
- Convert nested objects into nested model classes automatically.
- Map arrays to generic List types and infer primitive value types.
- Optionally add System.Text.Json JsonPropertyName attributes.
- Use a custom root class name and nullable reference annotations.
- Copy or download production-ready C# source without uploading data.
Frequently Asked Questions
What does the JSON to C# converter generate?
It generates C# class definitions from a JSON object or array, including inferred primitive types, nested classes, and List collection types.
Are JsonPropertyName attributes included?
Yes, they are enabled by default and are added when the generated C# property name differs from the original JSON key. You can turn them off in Options.
Does the converter upload my JSON?
No. Parsing and code generation happen entirely in your browser. Your JSON is not sent to a server.
Can I use the result with Newtonsoft.Json?
The generated model uses System.Text.Json JsonPropertyName attributes. Turn off attributes if you prefer to add Newtonsoft.Json JsonProperty attributes for your own project.