sindresorhus/p-limit

Health v2 · maintenance only

Adoption not part of the score

2919 stars · 141 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

A tiny JavaScript library that limits the concurrency of promise-returning and async functions, so only a fixed number run at once. It works in Node.js and browsers and provides queue introspection, dynamic concurrency adjustment, and batch mapping helpers.

Use cases

• limit concurrent http requests to avoid rate limits
• run async tasks with a maximum of N at a time
• throttle promise-based function calls in node
• process a batch of items with limited parallelism
• control how many database queries run concurrently
• queue async jobs and clear pending ones on shutdown

When to choose

• you need simple, dependency-free concurrency limiting for promises in Node.js or the browser
• you want queue counts, dynamic limit changes, or a map helper for batched async work

When to avoid

• you need full job queues with retries, persistence, or workers (use a task queue library)
• you need rate limiting by time window rather than concurrency
• you're not using promises/async functions

Facets

library · maturity stable

concurrency rate-limiting developer-tools developer-tools web-development backend browser cross-platform promise async throttle task-queue batch-processing npm automation nodejs javascript

Member repositories

For agents

markdown · JSON · MCP: product_card(name="sindresorhus/p-limit")