JSON to C# Class

Generate C# classes from JSON with [JsonPropertyName] attributes for the modern System.Text.Json serializer. For Newtonsoft.Json, swap to [JsonProperty] and add using Newtonsoft.Json;.

How to use the JSON to C# Class

Paste JSON. Output uses System.Text.Json (the default in modern .NET 6+). For records, you can collapse the property syntax to public record Response(string Id, string Name); manually.

Generating C# classes from JSON

When you consume an API in C# you want strongly-typed classes, not JsonElement lookups and string keys scattered through your code. But hand-writing those classes from a sample response — getting every property name, type, and serializer attribute right — is dull and easy to get subtly wrong.

This generates C# classes from a JSON sample, annotated with [JsonPropertyName] for the modern System.Text.Json serializer that ships with .NET 6 and later, nesting a class for each nested object. If your project still uses Newtonsoft.Json, switch the attributes to [JsonProperty]; for the equivalent on other platforms, the Java, Go, and Rust generators follow the same idea.

Common use cases

  • Type an API client — turn a sample response into C# model classes.
  • System.Text.Json — get [JsonPropertyName] attributes for the modern serializer.
  • Nested models — generate a class per nested object automatically.
  • Scaffold DTOs — create data-transfer objects without a schema.
  • Records — start from generated classes and collapse to a record where it fits.

Frequently asked questions

Which serializer does it target?
System.Text.Json, the default in .NET 6 and later, using [JsonPropertyName] attributes.

What about Newtonsoft.Json?
Swap [JsonPropertyName] for [JsonProperty] and add a using for Newtonsoft.Json; the class structure is the same.

Are nested objects handled?
Yes — each nested object becomes its own class, referenced from the parent property.

Can I get records instead of classes?
The output is classes by design; you can collapse a class to a positional record by hand where that style suits.
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