Q: How do you fetch autocomplete suggestions from an API in JavaScript?

Use fetch: const res = await fetch(`/api/suggestions?q=${encodeURIComponent(query)}`); return await res.json(). Always encode the query with encodeURIComponent to handle special characters.

Q: How do you cache autocomplete suggestions in JavaScript?

Use a Map: if cache.has(query) return cache.get(query); otherwise fetch, then cache.set(query, data). This avoids duplicate API calls for the same query, improving performance and reducing server load.

Q: How do you cancel previous autocomplete requests in JavaScript?

Use AbortController: before each fetch, abort the previous controller and create a new one. Pass the signal to fetch. If the user types quickly, only the last request completes; previous ones are aborted.

Question 1

How do you add expiration to an autocomplete cache?

Accepted Answer

Store { data, timestamp } in the cache. On lookup, check if Date.now() - timestamp < CACHE_TTL. If the entry is too old, fetch fresh data and update the cache. This prevents stale suggestions.

Question 2

How do you fetch autocomplete suggestions from an API in JavaScript?

Accepted Answer

Use fetch: const res = await fetch(`/api/suggestions?q=${encodeURIComponent(query)}`); return await res.json(). Always encode the query with encodeURIComponent to handle special characters.

Question 3

How do you cache autocomplete suggestions in JavaScript?

Accepted Answer

Use a Map: if cache.has(query) return cache.get(query); otherwise fetch, then cache.set(query, data). This avoids duplicate API calls for the same query, improving performance and reducing server load.

Question 4

How do you cancel previous autocomplete requests in JavaScript?

Accepted Answer

Use AbortController: before each fetch, abort the previous controller and create a new one. Pass the signal to fetch. If the user types quickly, only the last request completes; previous ones are aborted.

How do you add expiration to an autocomplete cache?

More FAQs in Autocomplete API Calls and Caching

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