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quicktype
What it is
quicktype converts structured input into models, serializers, and validators in more than 25 languages. It accepts sample JSON, API URLs, JSON Schema, TypeScript, and GraphQL queries, then infers details such as nullable fields, optional properties, numeric types, dates, UUIDs, enums, unions, maps, and nested type names. Generated code can read, write, and validate data. The browser app lets users paste JSON and generate code; it works offline and does not send sample data over the Internet. The CLI processes files, URLs, directories of samples, or standard input, making it usable in build pipelines, CI jobs, and git hooks. A hosted MCP endpoint connects with Claude Code, Cursor, Codex, or other MCP clients without an API key. quicktype is open source under the Apache-2.0 license, and the web app and CLI are free. The CLI and Node.js packages require Node.js 20 or newer. It is available on web, Linux, macOS, and Windows.
For and against
For
- Generates models, serializers, and validators in over 25 languages.
- Accepts JSON, API URLs, schemas, TypeScript, and GraphQL.
- The browser app works offline without sending sample data.
- CLI supports files, URLs, directories, and standard input.
- Open source under the Apache-2.0 license.
Against
- CLI and Node.js packages require Node.js 20 or newer.
- Project scaffolding is not available.
The verdict
quicktype offers browser and command-line workflows for translating structured data into typed code. Its free, open-source availability and broad input options make it suitable for developers who need generated models, serialization, or validation.
Who it suits
It suits developers who need typed models and related code from structured data, including teams building API clients or tracking API changes. The CLI and Node.js packages require Node.js 20 or newer.
Plans and prices
FREE
Web app + CLI · Community Slack · Apache2 license
Read 30 Sep 2026 · next.quicktype.io
1 target language
Email support · 30 min. technical planning
Read 30 Sep 2026 · next.quicktype.io
2 target languages
Chat support · 7-day hotfixes · 2 hr. technical planning
Read 30 Sep 2026 · next.quicktype.io
On the record
- Browser privacy
- The web app works offline and does not send sample data over the Internet.github.com · read 30 Sep 2026
- Browser use
- The product offers a browser app for pasting JSON and generating code.quicktype.io · read 30 Sep 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 · read 30 Sep 2026
- CLI requirement
- The CLI and Node.js packages require Node.js 20 or newer.github.com · read 30 Sep 2026
- Code output
- Generated output can include serializers and runtime validation code along with types.quicktype.io · read 30 Sep 2026
- Command line
- The CLI can generate code from files, URLs, directories of samples, or standard input.quicktype.io · read 30 Sep 2026
- Community support
- The project directs users to a quicktype Slack community for help and discussion.github.com · read 30 Sep 2026
- Contributors
- The official site says more than 200 contributors have contributed to the open source project.quicktype.io · read 30 Sep 2026
- Generated serialization
- quicktype generates code to read, write, and validate data in the target language.quicktype.io · read 30 Sep 2026
- Inference
- It can infer nullability, optional fields, numeric types, dates, UUIDs, enums, unions, maps, and nested type names.quicktype.io · read 30 Sep 2026
- Inference capabilities
- quicktype detects enums, dates, UUIDs, numeric types, nullable properties, unions, maps, and equivalent structures.quicktype.io · read 30 Sep 2026
- Inputs
- It accepts sample JSON, API URLs, JSON Schema, and GraphQL queries.quicktype.io · read 30 Sep 2026
- MCP endpoint
- The MCP server URL is https://mcp.quicktype.io/mcp.mcp.quicktype.io · read 30 Sep 2026
- MCP integration
- A hosted MCP endpoint connects quicktype to Claude Code, Cursor, Codex, or any MCP client without an API key.quicktype.io · read 30 Sep 2026
- Offline and privacy
- The GitHub README says the web app works offline and does not send sample data over the Internet.github.com · read 30 Sep 2026
- Open source
- The GitHub repository identifies quicktype as open source under the Apache-2.0 license.github.com · read 30 Sep 2026
- Purpose
- quicktype infers types from JSON and generates models, serializers, and validators in more than 25 languages.quicktype.io · read 30 Sep 2026
- Runtime requirement
- The quicktype CLI and Node.js packages require Node.js 20 or newer.github.com · read 30 Sep 2026
