quicktype

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Score7.4

Rank#1 of 33

From$19/mo

Free planYes

Runs onAPI, Linux, macOS, Web, Windows

Summary

quicktype turns structured data into types and related code. It infers types from JSON and generates models, serializers, and validators in more than 25 languages. Inputs include sample JSON, API URLs, JSON Schema, TypeScript, and GraphQL queries. It can detect structures such as nullable or optional fields, numeric types, dates, UUIDs, enums, unions, maps, and nested types. Generated code can read, write, and validate data in the target language. The browser app lets users paste JSON and generate code; the project says this app works offline without sending sample data over the Internet. Its CLI can process files, URLs, directories of samples, or standard input, including in build pipelines, CI jobs, and git hooks. A hosted MCP endpoint connects to Claude Code, Cursor, Codex, or other MCP clients without an API key. quicktype is open source under the Apache-2.0 license, and its web app and CLI are free. The CLI and Node.js packages require Node.js 20 or newer.

Who it is for

It suits developers and teams generating typed API clients, tracking API changes, or giving IDEs and AI agents a typed data model. The browser app offers a direct route from pasted JSON to code; the CLI supports automated workflows.

What is good

Generates code in more than 25 languages
Accepts JSON, schemas, URLs, and GraphQL queries
Creates serializers and runtime validation code
Browser app works offline without sending sample data
Free web app and CLI

What to know first

CLI and Node.js packages require Node.js 20 or newer
Project scaffolding is not included

Verdict

quicktype is a focused option for turning data structures into typed models and supporting code. Its free browser app and CLI cover different workflows, with Node.js 20 or newer required for command-line and Node.js package use.

quicktype plans and pricing

All plans

FREE Free Web app + CLI · Community Slack · Apache2 license next.quicktype.io · 30 Sept 2026

1 target language $19/mo Billed annually Email support · 30 min. technical planning next.quicktype.io · 30 Sept 2026

2 target languages $129/mo Chat support · 7-day hotfixes · 2 hr. technical planning next.quicktype.io · 30 Sept 2026

Compared on code generators

Free plan: Yesquicktype.io
Project scaffolding: Noquicktype.io
Schema-to-code generation: Yesquicktype.io
CLI available: Yesquicktype.io
IDE plugins: Yesquicktype.io
Supported languages: C, C#, C++, Crystal, Dart, Effect Schema, Elixir, Elm, Flow, Go, GraphQL, Haskell, Java, JavaScript, JSON Schema, Kotlin, Objective-C, PHP, Pike, Python, Ruby, Rust, Scala, Smithy, Swift, TypeScript, Zodquicktype.io

Facts

Purpose: quicktype infers types from JSON and generates models, serializers, and validators in more than 25 languages.quicktype.io · 30 Sept 2026
Inputs: It accepts sample JSON, API URLs, JSON Schema, and GraphQL queries.quicktype.io · 30 Sept 2026
Inference: It can infer nullability, optional fields, numeric types, dates, UUIDs, enums, unions, maps, and nested type names.quicktype.io · 30 Sept 2026
Code output: Generated output can include serializers and runtime validation code along with types.quicktype.io · 30 Sept 2026
Browser use: The product offers a browser app for pasting JSON and generating code.quicktype.io · 30 Sept 2026
CLI: The CLI can generate code from files, URLs, or standard input and can be used in a build pipeline, CI job, or git hook.quicktype.io · 30 Sept 2026
MCP integration: A hosted MCP endpoint connects quicktype to Claude Code, Cursor, Codex, or any MCP client without an API key.quicktype.io · 30 Sept 2026
MCP endpoint: The MCP server URL is https://mcp.quicktype.io/mcp.mcp.quicktype.io · 30 Sept 2026
Open source: The GitHub repository identifies quicktype as open source under the Apache-2.0 license.github.com · 30 Sept 2026
Offline and privacy: The GitHub README says the web app works offline and does not send sample data over the Internet.github.com · 30 Sept 2026
CLI requirement: The CLI and Node.js packages require Node.js 20 or newer.github.com · 30 Sept 2026
Who it serves: The site describes using generated types to help teams build API clients, catch API changes, and give IDEs and AI agents a typed model of data.quicktype.io · 30 Sept 2026
What it does: quicktype infers types from JSON and generates models, serializers, and validators in more than 25 languages.quicktype.io · 30 Sept 2026
Supported inputs: quicktype accepts sample JSON, API URLs, JSON Schema, TypeScript, and GraphQL queries.github.com · 30 Sept 2026
Inference capabilities: quicktype detects enums, dates, UUIDs, numeric types, nullable properties, unions, maps, and equivalent structures.quicktype.io · 30 Sept 2026
Generated serialization: quicktype generates code to read, write, and validate data in the target language.quicktype.io · 30 Sept 2026
Command line: The CLI can generate code from files, URLs, directories of samples, or standard input.quicktype.io · 30 Sept 2026
Browser privacy: The web app works offline and does not send sample data over the Internet.github.com · 30 Sept 2026
Runtime requirement: The quicktype CLI and Node.js packages require Node.js 20 or newer.github.com · 30 Sept 2026
Community support: The project directs users to a quicktype Slack community for help and discussion.github.com · 30 Sept 2026
Usage scale: The official site says millions of developers have generated billions of lines of code with quicktype.quicktype.io · 30 Sept 2026
Contributors: The official site says more than 200 contributors have contributed to the open source project.quicktype.io · 30 Sept 2026