JSON → TypeScript

Generate TS interfaces from JSON

JSON input

TypeScript interfaces

interface Root {
  id: number;
  name: string;
  isActive: boolean;
  tags: string[];
  address: Address;
  orders: Order[];
}

interface Order {
  sku: string;
  qty: number;
}

interface Address {
  city: string;
  zip: string;
}

Interfaces are inferred from one sample — optional fields and unions across multiple samples aren't detected. Nested objects and arrays of objects get their own interfaces.

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About the JSON → TypeScript

Generate TypeScript interfaces from JSON automatically: paste an API response and get typed interfaces for the root object and every nested object and array, with safe handling of unusual keys. Skip the tedium of hand-writing types for API payloads.

How to use

1Paste sample JSON.
2Name the root interface.
3Copy the generated TypeScript.

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JSON → TypeScript is part of DevKit — 100 free, privacy-first tools for developers, students, and everyone, built by Minhazul Ashim. Everything runs in your browser; your data never leaves your machine.