This is not

Like what you see? Install OctoLinker now!

Skip to content
Map over promises concurrently
JavaScript TypeScript
Branch: master
Clone or download
Type Name Latest commit message Commit time
Failed to load latest commit information.
.github Tidelift tasks May 31, 2019
.editorconfig Meta tweaks Sep 12, 2017
.gitattributes Require Node.js 6 Jul 28, 2018
.gitignore Meta tweaks Sep 12, 2017
.npmrc Meta tweaks Sep 12, 2017
.travis.yml Require Node.js 8 Jul 13, 2019
index.d.ts Require Node.js 8 Jul 13, 2019
index.js Require Node.js 8 Jul 13, 2019
index.test-d.ts Require Node.js 8 Jul 13, 2019
license Meta tweaks Sep 12, 2017
package.json 3.0.0 Jul 13, 2019 Require Node.js 8 Jul 13, 2019
test.js Fix test race condition (#21) Aug 18, 2019

p-map Build Status

Map over promises concurrently

Useful when you need to run promise-returning & async functions multiple times with different inputs concurrently.


$ npm install p-map


const pMap = require('p-map');
const got = require('got');

const sites = [
	getWebsiteFromUsername('https://sindresorhus'), //=> Promise

(async () => {
	const mapper = async site => {
		const {requestUrl} = await got.head(site);
		return requestUrl;

 	const result = await pMap(sites, mapper, {concurrency: 2});

	//=> ['', '', '']


pMap(input, mapper, options?)

Returns a Promise that is fulfilled when all promises in input and ones returned from mapper are fulfilled, or rejects if any of the promises reject. The fulfilled value is an Array of the fulfilled values returned from mapper in input order.


Type: Iterable<Promise | unknown>

Iterated over concurrently in the mapper function.

mapper(element, index)

Type: Function

Expected to return a Promise or value.


Type: object


Type: number
Default: Infinity
Minimum: 1

Number of concurrently pending promises returned by mapper.


Type: boolean
Default: true

When set to false, instead of stopping when a promise rejects, it will wait for all the promises to settle and then reject with an aggregated error containing all the errors from the rejected promises.


  • p-all - Run promise-returning & async functions concurrently with optional limited concurrency
  • p-filter - Filter promises concurrently
  • p-times - Run promise-returning & async functions a specific number of times concurrently
  • p-props - Like Promise.all() but for Map and Object
  • p-map-series - Map over promises serially
  • p-queue - Promise queue with concurrency control
  • More…

Get professional support for this package with a Tidelift subscription
Tidelift helps make open source sustainable for maintainers while giving companies
assurances about security, maintenance, and licensing for their dependencies.
You can’t perform that action at this time.