Convert JSON to TypeScript

Generate TypeScript interfaces from any JSON: nested objects become named interfaces, arrays get element types, key names are sanitized automatically. Paste JSON — copy the types.

Input

Output

interface Root {
  id: number;
  name: string;
  email: string;
  tags: string[];
  address: Address;
}

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

Frequently asked questions

How do I convert JSON to a TypeScript interface?

Paste your JSON into the input field — the generator builds interfaces automatically. Copy the result into your .ts or .d.ts file.

How are nested objects handled?

Each nested object becomes its own interface, named after its key (capitalized), and the parent references it by name.

What happens with inconsistent keys?

The generator merges fields from all array elements, so optional or missing keys still appear. Null values make the field nullable.