Developer Utilities · Free tool

JSON to TypeScript Interface

Paste any JSON and get matching TypeScript interfaces. Handles nested objects, arrays, optional and nullable fields.

Updated April 2026

Root type namePaste JSON

interface Root {
  id: number;
  name: string;
  active: boolean;
  tags: string[];
  profile: Profile;
}

interface Profile {
  age: number;
  city: string;
}

What it does

Paste any JSON object and get a matching TypeScript interface — nested types, optional fields, and array detection included.

How to use it

Paste a JSON object.
Name the root interface.
Copy the generated TypeScript.