You’ve already used async and await when making API calls on the frontend. In backend TypeScript, you’ll use them in a similar way.

In backend code, async/await is often used for database queries and file operations, not just HTTP requests.

The most important thing to know is how to type the return value. In TypeScript, an async function always returns a Promise of a specific type. For example:

async function fetchUser(id: number): Promise<User> {
  // Simulate database call (pseudo code)
  const user = await database.getUser(id);
  return user;
}

Here, Promise<User> means this function will eventually give you a User object. You’ll use this pattern a lot when working with databases or APIs.


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