JSON to C# Model Converter

From a JSON sample to a C# model

The output is a class of auto-properties, each carrying a [JsonPropertyName] attribute holding the original key. That attribute is what makes the model independent of naming policy: System.Text.Json honours it ahead of any naming convention, so the class decodes the same whether the payload is camelCase, snake_case or something in between.

Adjustments worth making

• Nullable reference types. With the feature on, a string property the server can omit should be string?, or the compiler is promising something the payload does not deliver.
• Value types. An int has no way to represent an absent number. Use int? wherever zero and missing mean different things.
• Records. For a read-only response model, turning the class into a record with init accessors buys value equality and immutability at no runtime cost.
• Money. A decimal in the sample infers as double. Change it to decimal for anything financial, because double cannot represent most two-place decimal fractions exactly.
• Nested objects become their own classes named from the key, and arrays take their element type from the first entry only.

Sharing the contract with a front end or another service: JSON to TypeScript and JSON to Go read the same payload.