sindresorhus/p-map

Health v2 · maintenance only

Adoption not part of the score

1510 stars · 76 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

p-map is a small Node.js/JavaScript library for mapping over iterables with promise-returning or async mapper functions concurrently, with controllable concurrency limits. It also provides an async iterable variant with backpressure support for streaming consumption.

Use cases

• run async functions over a list with limited concurrency
• fetch many URLs in parallel without overwhelming the server
• control how many promises run at once instead of Promise.all
• stop iteration early when a task fails
• stream mapper results as an async iterable with backpressure

When to choose

• you need bounded concurrency for promise-based work in Node.js
• you want results in input order with error control
• you need backpressure when consuming results slower than they're produced

When to avoid

• you just need Promise.all with no concurrency limit
• you're not in a JavaScript/Node.js environment
• you need worker-thread or multi-process parallelism for CPU-bound tasks

Facets

library · maturity stable

concurrency http-client developer-tools web-development backend promise async-await parallel-processing async-iterable backpressure nodejs javascript

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