Instantly generate Dart from JSON

Generate Dart models from JSON, JSON Schema, Postman collections, and GraphQL queries.

quicktype is fluent in

Pick a language to try it in your browser.

Run quicktype from the command line

Install it once with npm and generate Dart from files, URLs, or stdin. It fits into a Makefile, 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 npm$ npm install -g quicktype$ npm install -g quicktype
Generate Dart for a simple JSON sample$ echo '[1, 2, 3.14]' | quicktype --lang dart$ echo '[1, 2, 3.14]' \    | quicktype -l dart
Generate Dart for a sample JSON file$ quicktype person.json -o Person.dart$ quicktype person.json -o Person.dart
Generate Dart from a directory of samples$ ls spotify-api-samples$ ls spotify-api-samples
album.json artist.json track.json$ quicktype spotify-api-samples -o SpotifyClient.dart$ quicktype -o SpotifyClient.dart \    spotify-api-samples

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Hunt for a client library: A good one is gold, but most are outdated, unmaintained, or simply don’t exist for your language.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 Dart nownpm install -g quicktype