JSON to TypeScript

JSON to TypeScript interface generation analyses a JSON sample and produces TypeScript interface definitions that match its structure. Every key becomes a typed property, nested objects become nested interfaces, and arrays are typed with their element type.

Prefer interface for object shapes you plan to extend or implement (classes can implement interfaces). Use type for unions, intersections, or when you need conditional types. This generator outputs interfaces by default, which works for most JSON deserialization use cases. Switch to type alias if you need to union the generated type with others.

Fields that appear in some sample objects but not others are marked optional with ?: (e.g. email?: string). Fields whose value is null in the sample are typed as T | null. If a field is missing from some objects AND null in others, it becomes T | null | undefined or optional nullable depending on the generator setting.

Each distinct nested object shape becomes its own named interface. The parent interface references the nested interface by name. All interfaces are output together so you can copy the entire block into your project. Names are derived from the JSON key in PascalCase — for example, a key "userProfile" becomes interface UserProfile.

Yes. Copy the generated interfaces into your project, then create a matching Zod schema manually: const UserSchema = z.object({name: z.string(), age: z.number()}). Tools like zod-to-ts (Zod → TypeScript) and ts-to-zod (TypeScript → Zod) can automate this conversion if your project already has one representation.