Instantly generate C# models and helper methods from JSON.

Generate C# classes with Json.NET attributes from JSON, JSON Schema, and GraphQL queries.

Generate C# now Install the Visual Studio extension

quicktype is fluent in

Pick a language to try it in your browser.

Run quicktype from the command line

Install it once with Homebrew or npm and generate C# from files, URLs, Postman collections, or stdin. It fits into an MSBuild target, a CI job, or a git hook as easily as a one-off.

The Backwater, an oil painting by Charles William Wyllie of a woman on a riverbank watching a man in a punt

quicktype — zsh — 96×32

Install quicktype with brew$ brew install quicktype$ brew install quicktype
Generate C# for a simple JSON sample$ echo '[1, 2, 3.14]' | quicktype --lang cs$ echo '[1, 2, 3.14]' \    | quicktype --lang cs
Generate C# for a sample JSON file$ quicktype person.json -o Person.cs$ quicktype person.json -o Person.cs
Generate C# from a directory of samples$ ls spotify-api-samples$ ls spotify-api-samples
album.json artist.json track.json$ quicktype spotify-api-samples -o QTSpotifyClient.cs$ quicktype -o SpotifyClient.cs \    spotify-api-samples
Generate C# models for a weather API$ quicktype https://goo.gl/Dq2yKd -o Weather.cs$ quicktype -o Weather.cs \    https://goo.gl/Dq2yKd
Generate C# classes from TypeScript types$ quicktype types.ts -o Types.cs$ quicktype types.ts -o Types.cs
Generate C# from a Postman Collection$ quicktype ImgurAPI_postman_collection.json -l postman -o Imgur.cs$ quicktype -o Imgur.cs \    -l postman \    ImgurAPI_postman_collection.json

The Backwater · Charles W. Wyllie, 1903

A better way to work with data

Most teams still hand-write types, or let a chatbot eyeball a payload. Generated types are faster to get, and they stay correct.

The old way

Hunt for a client library: A good one is gold, but most are outdated, unmaintained, or simply don’t exist for your language.
Write the types by hand, or have a chatbot guess: Slow, error-prone, and stale the moment the API changes. An LLM eyeballing a payload misses optional fields, mislabels numbers, and invents structure that isn’t there.
Read the data as dynamic, untyped values: Every field access is a runtime gamble, and neither your compiler, your IDE, nor your AI assistant can help you.

With quicktype

Generate the client code: Give quicktype sample responses and get idiomatic, strongly typed models and serializers in your app’s language, in seconds.
Regenerate when the API changes: Run quicktype in your build or CI. When the API changes, regenerate and let the compiler point you at exactly what to update.
Give your tools something to work with: Typed data unlocks autocomplete, refactoring, and validation in your IDE, and gives AI agents an accurate model of your data instead of a guess.

Stop guessing at data.

Paste JSON and get typesafe code in seconds, in the browser, in your terminal, or inside your AI agent.

Generate C# nownpm install -g quicktype