Class or record
Classes with { get; set; } properties, or positional records with property attributes.
JSON to C# Class Generator
Create C# classes or records with System.Text.Json attributes from example JSON.
Input
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Result
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Original (left)
1
Modified (right)
1
Differences
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About this tool
How the JSON to C# Class works
Generate C# classes or records from JSON with [JsonPropertyName] attributes, nullable reference types and List<T>. Ready for System.Text.Json.
How to use the JSON to C# Class
- Paste JSON.
- Choose class or record and set the root type name.
- Copy the code into your project.
JSON to C# Class example
{"id":7,"user_name":"aarav","rating":4.5}using System.Text.Json.Serialization;
public class User
{
[JsonPropertyName("id")]
public int Id { get; set; }
[JsonPropertyName("user_name")]
public string UserName { get; set; } = string.Empty;
[JsonPropertyName("rating")]
public double Rating { get; set; }
}When to use it
- Deserializing API responses in ASP.NET Core or Blazor.
- Defining DTOs for minimal APIs.
- Reading JSON settings in console apps.
Tip: Paste several array items so properties that are sometimes missing are detected as nullable.
Exact key mapping
[JsonPropertyName] keeps the original JSON key while properties use PascalCase.
Nullable aware
Optional and null fields become string?, int? and so on; required strings default to string.Empty.
Rich types
long for large numbers, double, bool, DateTimeOffset for ISO timestamps and List<T> for arrays.
FAQ
Common questions
Which serializer is targeted?
System.Text.Json (.NET Core 3.0 and later). For Newtonsoft.Json, replace [JsonPropertyName] with [JsonProperty].
Why do some properties end with ?
They were null or missing in your sample, so they are nullable.
Does it need nullable reference types?
The output assumes <Nullable>enable</Nullable>, which is the default for new .NET projects.
Is my JSON private?
Yes, generation happens in your browser.
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