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JSON Toolbox- Free online JSON tools

JSON to C#

Convert JSON to C# classes online. Types are inferred for nested objects and arrays — and everything runs in your browser.

  • 100% client-side, nothing uploaded
  • Instant results
  • Works offline once loaded
Input JSON

Empty

C# output

Empty

How it works

About this tool

This free online JSON to C# generator turns a sample JSON payload into C# classes. Paste a representative response, set a root type name, and the tool infers a type for every field — including nested objects and array elements.

Properties use auto-implemented get/set accessors with PascalCase names. When a property name differs from the JSON key, a [JsonPropertyName] attribute is added, and nullable value types use the ? suffix.

A fast way to scaffold System.Text.Json models from an API sample for ASP.NET clients or backend services.

Generation runs entirely in your browser. Your JSON is never uploaded or stored, so it is safe to use with production API responses and payloads that contain sensitive data.

JSON Toolbox processes all data locally in the browser. Nothing is uploaded to a server.

Common questions

Frequently asked questions

How do I convert JSON to C#?
Paste your JSON into the input editor and the generated C# code appears on the right. Set a root type name to control what the top-level type is called, then copy or download the result.
Does it handle nested objects and arrays?
Yes. Nested objects become their own named types, and arrays are typed by their element. When objects in an array have slightly different shapes, their fields are merged and any field missing from some items is marked optional.
What should I know about the generated C# code?
Naming and nullability follow the sample. Dictionary-like objects and mixed-type arrays may need manual cleanup. Confirm decimal vs double and DateTime handling against your API’s real formats.
Is my JSON uploaded anywhere?
No. The C# code is generated locally in your browser. Nothing is sent to a server, logged, or stored — even for large or sensitive payloads.

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