JSON to Code

Paste JSON and get ready-to-use types or classes in 27 languages. Each language has its own page, for example /json-to-typescript, /json-to-go and /json-to-python. Switch language with the dropdown — your JSON comes with you.

Code generation uses the open-source quicktype engine and runs in a background thread in your browser.

Supported languages

Popular: TypeScript, Zod, Go, Python, Java, C#, Kotlin, Rust, Swift, Dart, PHP, JSON Schema. More: JavaScript, C++, C, Ruby, Scala, Elixir, Haskell, Elm, Crystal, Objective-C, Effect Schema, Flow, React PropTypes, Smithy, Pike.

Getting the best types

• Use real data with variety. Fields missing (or null) in some items become optional.
• Give several samples. Paste them as JSON Lines — one JSON value per line — and they’re merged into one type:

{"id": 1, "name": "Ada"}
{"id": 2, "name": "Grace", "email": "grace@example.com"}
{"id": 3, "name": null}

becomes id: number; name: null | string; email?: string.

• Paste JavaScript objects straight from a console — unquoted keys, single quotes, trailing commas and comments are repaired automatically.
• Set the Type name of the top-level type (e.g. Order).

JSON Schema input

Switch the input to JSON Schema to generate code from a schema instead of examples. References to other URLs ($ref to the web) are not fetched.

Options

• Each language shows its own options (for example Interfaces only for TypeScript, omitempty for Go, Pydantic for Python). More appear under More options & type detection. Options are remembered per language.
• Type detection is deliberately quiet by default — strings stay strings. Turn on Detect enums, Detect dates, Numbers in strings, etc. when you want them.

Download

Download saves the code with the right extension (Order.ts, Order.go, Order.py…).