JSON → TypeScript

generate interfaces from a JSON sample: nested objects, arrays, union types, optional fields

JSON

Root type name

New keys as optional

TypeScript

export interface Root {
  id: number;
  name: string;
  price: number;
  in_stock: boolean;
  tags: string[];
  sizes: Sizes[];
  meta: Meta;
}

Everything runs locally in the browser — nothing is sent anywhere. Same-named objects in different places merge into one interface; mixed-type arrays become unions. For production, validate the result with zod/io-ts if runtime checking is needed.

Über Json To Types

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