Question 1

How to limit concurrent API requests with p-limit?

Accepted Answer

Import p-limit, create a limiter with your desired concurrency, and wrap async API calls. For example: const limit = pLimit(3); await Promise.all(urls.map(url => limit(() => fetch(url)))); This ensures only 3 requests run simultaneously, preventing rate limiting.

Question 2

p-limit or p-queue: which should I use for my project?

Accepted Answer

Choose p-limit for simple concurrency limiting with minimal overhead, as it's lightweight and easy to use. Opt for p-queue if you need advanced features like task prioritization, pausing, or event handling, since p-limit focuses solely on concurrency control.

Question 3

Can p-limit handle errors in async functions?

Accepted Answer

Yes, errors propagate normally; if a wrapped async function rejects, p-limit doesn't interfere, so you can use standard try-catch or .catch() for error handling, just like with regular promises.

Question 4

How do I clear pending promises in p-limit without memory leaks?

Accepted Answer

Use limit.clearQueue() with the rejectOnClear option enabled. This rejects pending promises with an AbortError, ensuring they don't remain unresolved and preventing potential memory issues, as recommended in the README.

Question 5

Is p-limit good for browser-based applications?

Accepted Answer

Yes, p-limit works in browsers, making it suitable for client-side tasks like throttling UI updates or managing concurrent fetch requests. Its lightweight nature ensures minimal impact on performance.

Question 6

What happens if I set concurrency to 1 in p-limit?

Accepted Answer

Setting concurrency to 1 serializes all async operations, meaning only one promise runs at a time. This is useful for avoiding race conditions or when sequential execution is required, such as with sensitive resources.

p-limit

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