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Dev tools · January 10, 2018

quicktype

Generate beautiful, typesafe code from data

quicktype launched on January 10, 2018 with 88 votes, #501 of 3,021 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 8 years on.

Visit quicktype.io ↗quicktype alternativestop 17% of January 2018

What it does

quicktype helps you build better apps faster by generating types from data. It infers types from JSON samples, then generates strongly typed models and serializers for working with that data in Swift, TypeScript, Go, C#, Java, C++, and more. Available in your browser, CLI, Xcode, and VS Code. It can also generate code from JSON Schema and GraphQL.

Millions of developers have used quicktype to generate ten billion lines of typesafe models, serializers, and validators from JSON, JSON Schema, and GraphQL in TypeScript, Python, Swift, C#, Go, Rust, Kotlin, Java, C++, Zod and more. Use it in the browser, from the command line, or give it to your AI coding agent over MCP.

quicktype infers types from your JSON and generates models, serializers, and validators in more than 25 languages. Millions of developers have generated billions of lines of code with it, and more than 200 contributors have contributed to its open source project. Use it in the browser, from the command line, in your build pipeline, or hand it to your AI coding agent over MCP . Three steps, in the browser, from the command line, or inside your agent. Sample JSON, an API URL, a JSON Schema, or a GraphQL query: whatever you have. You get models, serializers, and validators in your language, named and typed sensibly. Your compiler, your IDE, and your AI agent can now all reason about the data.…from quicktype.io

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