Network interview questions

Build a contact form that posts the user's name, email, and message to a backend endpoint.

Fetch successive pages with an opaque cursor, accumulating items and tracking whether more remain.

Build a Like button that toggles between liked and unliked states with matching visual feedback.

Fetch with a timeout that aborts the request via AbortController and honors an external abort signal.

Build an autocomplete that debounces typing, fetches matching results from an API, and handles loading and stale responses.

Build a widget that fetches birth year data from an API and renders it as a histogram of bucketed counts.

Cache responses by URL and revalidate with an ETag, reusing cached data on a 304 Not Modified.

Build an axios-style client whose request and response interceptors transform each call as it passes through the chain.

Build a list that loads more items as the user scrolls near the bottom using an observer.

Build a job board that fetches and renders recent Hacker News job postings with paginated loading.

Wrap an async call with retries, backoff, and a per-attempt timeout so transient failures recover.

Build a signup form that validates user details on submit and posts them to a back-end API.

Build a production autocomplete with async fetch, debounce, keyboard navigation, caching, and match highlighting.

Build a search box that caches results per query and dedupes in-flight requests.