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How can I check the current number of active tasks?

About sindresorhus/p-limit · 2 messages · last activity 5/18/2026

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 activeCount property on the limit function.

According to the API documentation [index.d.ts:L1-L6], activeCount is a read-only property that returns "The number of promises that are currently running."

Here's how to use it:

import pLimit from 'p-limit';

const limit = pLimit(5);

// ... queue up some tasks ...

console.log(limit.activeCount); // Check how many are running right now

Similarly, if you want to see how many tasks are waiting to run (not yet executing), you can use the pendingCount property [index.d.ts:L8-L11], which returns "The number of promises that are waiting to run (i.e. their internal fn was not called yet)."

FOLLOW_UPS:

  • What's the difference between activeCount and pendingCount?
  • How do I dynamically change the concurrency limit?
  • Can I monitor when a task completes?

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