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Like `Promise.all()` but for `Map` and `Object`
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Latest commit 5b99b34 Aug 31, 2019

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Like Promise.all() but for Map and Object

Useful when you need to run multiple promises concurrently and keep track of the fulfilled values by name.


$ npm install p-props


const pProps = require('p-props');
const got = require('got');

(async () => {
	const fetch = async url => {
		const {body} = await got(url);
		return body;

	const sites = {
		ava: fetch(''),
		todomvc: fetch(''),
		github: fetch(''),
		foo: 'bar'

	console.log(await pProps(sites));
		ava: '<!doctype …',
		todomvc: '<!doctype …',
		github: '<!doctype …',
		foo: 'bar'


pProps(map, [mapper], [options])

Returns a Promise that is fulfilled when all promises in map and ones returned from mapper are fulfilled, or rejects if any of the promises reject. The fulfilled value is the same as map, but with a fulfilled version of each entry value, or the fulfilled value returned from mapper, if defined.


Type: Map | object

Resolves entry values that are promises. Other values are passed through.

mapper(value, key)

Type: Function

Receives the current value and key as parameters. If a value is a Promise, mapper will receive the value this Promise resolves to. Expected to return a Promise or value.


Type: object

See the p-map options.


  • p-all - Run promise-returning & async functions concurrently with optional limited concurrency
  • p-map - Map over promises concurrently
  • More…


MIT © Sindre Sorhus

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