Paste JSON and get C# classes with typed properties, nested types and lists — annotated for System.Text.Json or Newtonsoft.Json, so keys like order_number map to OrderNumber.
Runs entirely in your browser — nothing you enter here is sent to a server.
To work with a JSON API in .NET you describe its shape as classes and let the serializer do the rest. Writing those classes by hand for a response with a dozen nested objects is slow and error-prone. Paste one real response here and the generator writes them: a class per object, a property per key, a type inferred from each value.
string, int or long, double, bool, a nested class, or List<T>. A value that was null in the sample becomes object.
Keys are converted to .NET naming — unit_price to UnitPrice — and an attribute records the original key so that serialization round-trips.
A property missing from some array elements becomes nullable: bool?, int?.
[JsonPropertyName] for System.Text.Json, [JsonProperty] for Newtonsoft.Json, or no attributes if you configure a naming policy instead.
The generated code compiles as it stands, but a sample cannot tell you everything. Change date strings to DateTimeOffset — both serializers parse ISO 8601 automatically. Use decimal rather than double for money. If nullable reference types are enabled in your project, mark properties that may be absent with ? or give the others a required modifier. And with System.Text.Json you can drop the attributes altogether by setting PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower (available from .NET 8).
With System.Text.Json: var value = JsonSerializer.Deserialize<Root>(json); With Newtonsoft.Json: var value = JsonConvert.DeserializeObject<Root>(json);
System.Text.Json is built into modern .NET and is faster; choose it for new projects. Newtonsoft.Json has more features and is the usual choice in older codebases.
Its value was null in the sample, so the type could not be inferred. Replace it with the real type once you know it.
Not directly, but the properties translate one to one: change "class" to "record" and "set" to "init".
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