TypeScript REST API Client

• Typed interfaces matching the API response shape
• Async fetch wrapper with a typed return value
• Loading and error state handling
• Render fetched data to the DOM dynamically

Follow these steps in order. Each one builds on the previous.

1. Step 1

   Set up a TypeScript project with tsconfig.json

2. Step 2

   Choose a public API (e.g. JSONPlaceholder or Open Library)

3. Step 3

   Define interfaces that match the API response structure

4. Step 4

   Write an async fetchData<T>() generic function

5. Step 5

   Call the function and handle the Promise with try/catch

6. Step 6

   Show a loading message while the request is in flight

7. Step 7

   Render the typed response data into the DOM

8. Step 8

   Display a user-friendly error message on failure

• TypeScript Handbook
• Using Fetch API
• JSONPlaceholder (free test API)