Generate C# class definitions from JSON with property attributes, nullable types, and JsonProperty annotations.
JSON to C# Class converts the structure observed in pasted JSON into C# class definitions suitable for DTOs or POCOs. It infers properties and candidate C# types from JSON values, represents nested objects with related classes, and can include nullable types, property attributes, and Newtonsoft.Json JsonProperty annotations. The important limitation is that a sample is not a contract: missing properties, nullability, numeric range, and alternative object shapes cannot be determined reliably from one example.
The converter examines JSON objects, arrays, strings, numbers, booleans, and null values, then expresses the observed structure as C# properties and class definitions. Nested objects can require additional class types, while array contents provide evidence for an element type. The result describes the supplied instance, so properties or value forms absent from that instance cannot influence the generated model.
Generated property attributes can preserve the connection between a JSON member name and its C# property. In particular, JsonProperty annotations identify Newtonsoft.Json member names when the JSON spelling should be retained independently of the C# identifier. Nullable output expresses permitted null values at the C# type level, but it should be reviewed against the actual data contract rather than accepted solely from one sample.
No. The classes reflect the structure and values available in the input example, not every payload permitted by the producer. Compare the result with the API or file-format contract, test additional samples, and review dates, enums, numbers, optional members, polymorphic objects, and serializer settings. Custom converters may still be necessary for representations that ordinary property types cannot capture.
No. JsonPropertyAttribute belongs to Newtonsoft.Json. System.Text.Json uses its own attributes, including JsonPropertyNameAttribute, and does not treat a Newtonsoft.Json JsonProperty annotation as an equivalent name mapping. If the target project uses System.Text.Json, replace or omit Newtonsoft-specific annotations and review the resulting naming and null-handling behavior under that serializer.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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