JSON → TypeScript

Generate TypeScript interfaces from JSON.

Root name:Style:

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

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

About this tool

Paste any JSON sample and get strongly-typed TypeScript interfaces or types. Detects optional fields by merging arrays of objects with different shapes.

Features

interface or type output
Merges array elements into a single shape with optionals
Names nested types from their key
Quoted keys for non-identifiers

How to use it

Paste a JSON example.
Set the root type name.
Copy the generated TypeScript.

🔒 100% private

Everything happens inside your browser using JavaScript and WebAssembly. Your files are never uploaded to a server, never stored, and never seen by us.

Frequently asked questions

Can it infer string literal unions?

Currently it produces 'string'; literal-union inference is on the roadmap.