# JSON to C# Model Converter

> Convert JSON objects into strongly-typed C# Model definitions and data models.

To convert JSON to C# Model, paste your JSON payload above and specify the root type name. The generator creates clean, idiomatic C# Model code definitions instantly in your browser without uploading your JSON data to external servers.

**URL:** https://convertto.tech/t/json-to-csharp
**Category:** Data & Format Tools (https://convertto.tech/c/data-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## 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.

> **Do not mix the two attribute sets** — The attribute emitted here is the `System.Text.Json` one. If the project still runs on `Newtonsoft.Json`, swap it for `[JsonProperty("...")]`. An assembly carrying both sets compiles cleanly and then ignores whichever one the active serialiser does not recognise, which is a slow bug to track down.

Sharing the contract with a front end or another service: [JSON to TypeScript](https://convertto.tech/t/json-to-typescript) and [JSON to Go](https://convertto.tech/t/json-to-go) read the same payload.

## How to use

1. Enter or paste your json.
2. Enter or paste your root type name.
3. Press Run, then download the result when it is ready.

## FAQ

### Does this JSON to C# Model converter upload my files?

No, all type generation runs purely in JavaScript in your browser.

## Sources

- [RFC 8259: The JavaScript Object Notation (JSON) Data Interchange Format](https://www.rfc-editor.org/rfc/rfc8259) — IETF
- [Microsoft Learn: JSON serialization with System.Text.Json](https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json/) — Microsoft

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