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async

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async

Higher-order functions and common patterns for asynchronous code

    3.2.4latest

Version published
Maintainers
5
Weekly downloads
47,895,498
increased by0.37%

Weekly downloads

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Github Actions CI status NPM version Coverage Status Join the chat at https://gitter.im/caolan/async jsDelivr Hits

Async is a utility module which provides straight-forward, powerful functions for working with asynchronous JavaScript. Although originally designed for use with Node.js and installable via npm i async, it can also be used directly in the browser. A ESM/MJS version is included in the main async package that should automatically be used with compatible bundlers such as Webpack and Rollup.

A pure ESM version of Async is available as async-es.

For Documentation, visit https://caolan.github.io/async/

For Async v1.5.x documentation, go HERE

// for use with Node-style callbacks... var async = require("async"); var obj = {dev: "/dev.json", test: "/test.json", prod: "/prod.json"}; var configs = {}; async.forEachOf(obj, (value, key, callback) => { fs.readFile(__dirname + value, "utf8", (err, data) => { if (err) return callback(err); try { configs[key] = JSON.parse(data); } catch (e) { return callback(e); } callback(); }); }, err => { if (err) console.error(err.message); // configs is now a map of JSON data doSomethingWith(configs); }); var async = require("async"); // ...or ES2017 async functions async.mapLimit(urls, 5, async function(url) { const response = await fetch(url) return response.body }, (err, results) => { if (err) throw err // results is now an array of the response bodies console.log(results) })

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What is async?

Higher-order functions and common patterns for asynchronous code

Is async popular?

The npm package async receives a total of 45,499,431 weekly downloads. As such, async popularity was classified as popular.

Is async well maintained?

We found that async demonstrated a healthy version release cadence and project activity. It has 5 open source maintainers collaborating on the project.

Last updated on 07 Jun 2022
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