Question 1

How to use p-all to limit concurrent API calls in Node.js?

Accepted Answer

Define async functions for each API request, then pass them to p-all with the concurrency option set. For example, `await pAll([() => fetch(url1), () => fetch(url2)], {concurrency: 3})` ensures no more than 3 calls run at once, preventing rate limiting.

Question 2

p-all vs p-limit: which is better for my project?

Accepted Answer

p-all is best for executing a predefined list of different async functions with concurrency control, while p-limit creates a reusable limit for any promise-returning functions dynamically. Use p-all for batch tasks, p-limit for ongoing or ad-hoc operations.

Question 3

Can I cancel all promises with p-all if one fails?

Accepted Answer

Yes, by setting stopOnError to true (the default), p-all stops execution on the first rejection. You can also use the signal option with an AbortController to manually cancel all pending promises, providing fine-grained control.

Question 4

Does p-all preserve the order of results like Promise.all?

Accepted Answer

Absolutely. p-all returns fulfilled values in the same order as the input functions, maintaining consistency with Promise.all() for easy integration and predictable output in your code.

Question 5

How to handle multiple errors in p-all?

Accepted Answer

Set the stopOnError option to false, and p-all will wait for all promises to settle. If any reject, it throws an AggregateError containing all errors, allowing you to handle failures comprehensively without stopping the entire batch.

Question 6

Is p-all suitable for processing large batches of files?

Accepted Answer

Yes, p-all is ideal for batch processing like file operations. Limit concurrency to avoid system strain, use error aggregation to handle failures gracefully, and it preserves order for easy mapping of results to inputs.

p-all

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