JSON to TypeScript
Generate TypeScript interfaces, type aliases or Zod schemas from JSON. Free and private: runs in your browser.
Paste a sample API response to get TypeScript types for every nested object.
Runs entirely in your browser. Nothing you paste is uploaded or stored.
Use cases
- Move data between APIs, config files and databases.
- Bootstrap models from a sample API response.
- Save time on repetitive hand-written boilerplate.
Frequently asked questions
Should I use interfaces or types?
Either works for object shapes. Interfaces can be extended and merged; types support unions. Zod also validates data at runtime.
Is the JSON to TypeScript free?
Yes. It is free with no sign-up, and it runs entirely in your browser, so your input is never uploaded or stored.
Should I use the generated output as-is?
Treat it as a strong starting point. Types are inferred from your sample, so review nullability, naming and edge cases before committing it.
Related tools
Checking one snippet is a start. Scan your whole repository for free with CodeInspector.