JSON to Types generates TypeScript interfaces and Zod validation schemas from a sample JSON payload. Paste an API response and get nested types, optional fields and arrays inferred automatically, ready to drop into a Next.js, Node or React codebase, so you spend less time hand-writing types.
How to use it
Paste a sample JSON payload.
Choose TypeScript interfaces or a Zod schema.
Copy the generated code into your project.
Features
TypeScript interface generation
Zod schema generation
Nested objects and arrays inferred
Runs locally
Frequently asked questions
Is my JSON sent to a server?
No. The tool runs entirely in your browser with JavaScript. Your JSON never leaves your device, nothing is logged, and it keeps working offline once the page has loaded.
Why generate a Zod schema as well as types?
TypeScript types disappear at runtime. A Zod schema validates real API data when it arrives and infers the same TypeScript type, so your types and validation never drift apart.