JSON to TypeScript Converter

Convert JSON to TypeScript

Paste JSON and TheCodeWala turns the detected structure into TypeScript. You can choose interfaces or type aliases, control exports, keep null values, and mark fields optional when the inferred model shows a field may be absent.

Why convert JSON to TypeScript?

APIs, fixtures and configuration files often begin as JSON. Converting that data into TypeScript gives your editor better autocomplete, catches shape mismatches earlier, and makes API contracts easier to discuss in code reviews.

JSON to TypeScript interface example

export interface User {
  id: number;
  name: string;
  active: boolean;
}

JSON to TypeScript type example

export type User = {
  id: number;
  name: string;
  active: boolean;
};

Nested JSON objects

Nested objects are represented as nested object types, so an API response with user profile, address or settings objects remains readable without flattening the original JSON structure.

Arrays and null values

Arrays are inferred from their contents. Empty arrays become unknown[], mixed arrays become unions, and null can be preserved as part of the generated type.

Privacy

This converter runs in browser memory. It does not make an Ajax request, does not store your input in localStorage, and does not write your JSON to Laravel logs, sessions, cookies or a database.

FAQ