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How can I check the current number of active tasks?

About sindresorhus/p-limit · 2 messages · last activity 7/20/2026

Question

How can I check the current number of active tasks?

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You can check the current number of active tasks using the limit.activeCount property.

According to the README [readme.md:L88-L91], activeCount returns "the number of promises that are currently running."

Here's a practical example from the recipes [recipes.md:L191-L214]:

import pLimit from 'p-limit';

const limit = pLimit(5);

const progressInterval = setInterval(() => {
	console.log(`Running: ${limit.activeCount}, pending: ${limit.pendingCount}`);
}, 250);

This pattern lets you monitor progress while work is executing. You can access activeCount at any time to see how many tasks are currently in progress.

FOLLOW_UPS:

  • How do I check pending task count?
  • What's the difference between activeCount and pendingCount?
  • Can I use activeCount to control task submission?

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