Generate production-ready interfaces, type aliases, or Zod schemas from real JSON.
JSON input
Generated TypeScript
Arrays of objects are merged automatically, so fields missing from some items become optional. Everything runs locally in your browser.
About JSON to TypeScript Interface & Zod Generator
Convert JSON to TypeScript interfaces, type aliases, or Zod schemas instantly. Handles nested objects, arrays, optional fields, and nulls in your browser.
How to use JSON to TypeScript
1Paste a valid JSON object or array.
2Name the root type and choose interface, type alias, or Zod schema output.
3Adjust optional-field and readonly preferences.
4Copy or download the generated TypeScript file.
Frequently Asked Questions
How does JSON to TypeScript conversion work?
The generator inspects every JSON value, infers primitive and nested object types, and creates reusable TypeScript declarations for the complete structure.
Can this generate Zod schemas?
Yes. Select Zod schema to create composable z.object and z.array validators, including inferred TypeScript types through z.infer.
Does my JSON leave the browser?
No. Parsing and type generation happen locally in your browser, so API payloads and private data are never uploaded.