A fully typed API client that queries a public REST API using the Fetch API, maps the response to TypeScript interfaces, and renders the data to the DOM.
Follow these steps in order. Each one builds on the previous.
Set up a TypeScript project with tsconfig.json
Choose a public API (e.g. JSONPlaceholder or Open Library)
Define interfaces that match the API response structure
Write an async fetchData<T>() generic function
Call the function and handle the Promise with try/catch
Show a loading message while the request is in flight
Render the typed response data into the DOM
Display a user-friendly error message on failure
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