Async Logo

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. An 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)
})

caolan/async

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"richText": "<article class=\"markdown-body entry-content container-lg\" itemprop=\"text\"><p dir=\"auto\"><a target=\"_blank\" rel=\"noopener noreferrer nofollow\" href=\"https://raw.githubusercontent.com/caolan/async/master/logo/async-logo_readme.jpg\"><img src=\"https://raw.githubusercontent.com/caolan/async/master/logo/async-logo_readme.jpg\" alt=\"Async Logo\" style=\"max-width: 100%;\"></a></p>\n<p dir=\"auto\"><a target=\"_blank\" rel=\"noopener noreferrer\" href=\"https://github.com/caolan/async/actions/workflows/ci.yml/badge.svg\"><img src=\"https://github.com/caolan/async/actions/workflows/ci.yml/badge.svg\" alt=\"Github Actions CI status\" style=\"max-width: 100%;\"></a>\n<a href=\"https://www.npmjs.com/package/async\" rel=\"nofollow\"><img src=\"https://camo.githubusercontent.com/3e22ec64e7b4852fe701588fb1398979a2a7fdc25c1966f6cf78c1feb2250ec8/68747470733a2f2f696d672e736869656c64732e696f2f6e706d2f762f6173796e632e737667\" alt=\"NPM version\" data-canonical-src=\"https://img.shields.io/npm/v/async.svg\" style=\"max-width: 100%;\"></a>\n<a href=\"https://coveralls.io/r/caolan/async?branch=master\" rel=\"nofollow\"><img src=\"https://camo.githubusercontent.com/ebe620e618eb397f55914b41fde858c4e8b4ea7d725266009b6112936a565dee/68747470733a2f2f636f766572616c6c732e696f2f7265706f732f63616f6c616e2f6173796e632f62616467652e7376673f6272616e63683d6d6173746572\" alt=\"Coverage Status\" data-canonical-src=\"https://coveralls.io/repos/caolan/async/badge.svg?branch=master\" style=\"max-width: 100%;\"></a>\n<a href=\"https://gitter.im/caolan/async?utm_source=badge&amp;utm_medium=badge&amp;utm_campaign=pr-badge&amp;utm_content=badge\" rel=\"nofollow\"><img src=\"https://camo.githubusercontent.com/2da7039d862cabe847953554272000b86e80b158a0723c9a832720b935df3f43/68747470733a2f2f6261646765732e6769747465722e696d2f4a6f696e253230436861742e737667\" alt=\"Join the chat at https://gitter.im/caolan/async\" data-canonical-src=\"https://badges.gitter.im/Join%20Chat.svg\" style=\"max-width: 100%;\"></a>\n<a href=\"https://www.jsdelivr.com/package/npm/async\" rel=\"nofollow\"><img src=\"https://camo.githubusercontent.com/8b6da7d24d9e26b5d8600872b0cc6aab74ae647ac8a088545fa94f62579e8cb6/68747470733a2f2f646174612e6a7364656c6976722e636f6d2f76312f7061636b6167652f6e706d2f6173796e632f62616467653f7374796c653d726f756e646564\" alt=\"jsDelivr Hits\" data-canonical-src=\"https://data.jsdelivr.com/v1/package/npm/async/badge?style=rounded\" style=\"max-width: 100%;\"></a></p>\n\n<p dir=\"auto\">Async is a utility module which provides straight-forward, powerful functions for working with <a href=\"http://caolan.github.io/async/v3/global.html\" rel=\"nofollow\">asynchronous JavaScript</a>. Although originally designed for use with <a href=\"https://nodejs.org/\" rel=\"nofollow\">Node.js</a> and installable via <code>npm i async</code>, it can also be used directly in the browser. An ESM/MJS version is included in the main <code>async</code> package that should automatically be used with compatible bundlers such as Webpack and Rollup.</p>\n<p dir=\"auto\">A pure ESM version of Async is available as <a href=\"https://www.npmjs.com/package/async-es\" rel=\"nofollow\"><code>async-es</code></a>.</p>\n<p dir=\"auto\">For Documentation, visit <a href=\"https://caolan.github.io/async/\" rel=\"nofollow\">https://caolan.github.io/async/</a></p>\n<p dir=\"auto\"><em>For Async v1.5.x documentation, go <a href=\"https://github.com/caolan/async/blob/v1.5.2/README.md\">HERE</a></em></p>\n<div class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"// for use with Node-style callbacks...\nvar async = require(&quot;async&quot;);\n\nvar obj = {dev: &quot;/dev.json&quot;, test: &quot;/test.json&quot;, prod: &quot;/prod.json&quot;};\nvar configs = {};\n\nasync.forEachOf(obj, (value, key, callback) =&gt; {\n fs.readFile(__dirname + value, &quot;utf8&quot;, (err, data) =&gt; {\n if (err) return callback(err);\n try {\n configs[key] = JSON.parse(data);\n } catch (e) {\n return callback(e);\n }\n callback();\n });\n}, err =&gt; {\n if (err) console.error(err.message);\n // configs is now a map of JSON data\n doSomethingWith(configs);\n});\"><pre><span class=\"pl-c\">// for use with Node-style callbacks...</span>\n<span class=\"pl-k\">var</span> <span class=\"pl-s1\">async</span> <span class=\"pl-c1\">=</span> <span class=\"pl-en\">require</span><span class=\"pl-kos\">(</span><span class=\"pl-s\">\"async\"</span><span class=\"pl-kos\">)</span><span class=\"pl-kos\">;</span>\n\n<span class=\"pl-k\">var</span> <span class=\"pl-s1\">obj</span> <span class=\"pl-c1\">=</span> <span class=\"pl-kos\">{</span><span class=\"pl-c1\">dev</span>: <span class=\"pl-s\">\"/dev.json\"</span><span class=\"pl-kos\">,</span> <span class=\"pl-c1\">test</span>: <span class=\"pl-s\">\"/test.json\"</span><span class=\"pl-kos\">,</span> <span class=\"pl-c1\">prod</span>: <span class=\"pl-s\">\"/prod.json\"</span><span class=\"pl-kos\">}</span><span class=\"pl-kos\">;</span>\n<span class=\"pl-k\">var</span> <span class=\"pl-s1\">configs</span> <span class=\"pl-c1\">=</span> <span class=\"pl-kos\">{</span><span class=\"pl-kos\">}</span><span class=\"pl-kos\">;</span>\n\n<span class=\"pl-s1\">async</span><span class=\"pl-kos\">.</span><span class=\"pl-en\">forEachOf</span><span class=\"pl-kos\">(</span><span class=\"pl-s1\">obj</span><span class=\"pl-kos\">,</span> <span class=\"pl-kos\">(</span><span class=\"pl-s1\">value</span><span class=\"pl-kos\">,</span> <span class=\"pl-s1\">key</span><span class=\"pl-kos\">,</span> <span class=\"pl-s1\">callback</span><span class=\"pl-kos\">)</span> <span class=\"pl-c1\">=&gt;</span> <span class=\"pl-kos\">{</span>\n <span class=\"pl-s1\">fs</span><span class=\"pl-kos\">.</span><span class=\"pl-en\">readFile</span><span class=\"pl-kos\">(</span><span class=\"pl-s1\">__dirname</span> <span class=\"pl-c1\">+</span> <span class=\"pl-s1\">value</span><span class=\"pl-kos\">,</span> <span class=\"pl-s\">\"utf8\"</span><span class=\"pl-kos\">,</span> <span class=\"pl-kos\">(</span><span class=\"pl-s1\">err</span><span class=\"pl-kos\">,</span> <span class=\"pl-s1\">data</span><span class=\"pl-kos\">)</span> <span class=\"pl-c1\">=&gt;</span> <span class=\"pl-kos\">{</span>\n <span class=\"pl-k\">if</span> <span class=\"pl-kos\">(</span><span class=\"pl-s1\">err</span><span class=\"pl-kos\">)</span> <span class=\"pl-k\">return</span> <span class=\"pl-s1\">callback</span><span class=\"pl-kos\">(</span><span class=\"pl-s1\">err</span><span class=\"pl-kos\">)</span><span class=\"pl-kos\">;</span>\n <span class=\"pl-k\">try</span> <span class=\"pl-kos\">{</span>\n <span class=\"pl-s1\">configs</span><span class=\"pl-kos\">[</span><span class=\"pl-s1\">key</span><span class=\"pl-kos\">]</span> <span class=\"pl-c1\">=</span> <span class=\"pl-c1\">JSON</span><span class=\"pl-kos\">.</span><span class=\"pl-en\">parse</span><span class=\"pl-kos\">(</span><span class=\"pl-s1\">data</span><span class=\"pl-kos\">)</span><span class=\"pl-kos\">;</span>\n <span class=\"pl-kos\">}</span> <span class=\"pl-k\">catch</span> <span class=\"pl-kos\">(</span><span class=\"pl-s1\">e</span><span class=\"pl-kos\">)</span> <span class=\"pl-kos\">{</span>\n <span class=\"pl-k\">return</span> <span class=\"pl-s1\">callback</span><span class=\"pl-kos\">(</span><span class=\"pl-s1\">e</span><span class=\"pl-kos\">)</span><span class=\"pl-kos\">;</span>\n <span class=\"pl-kos\">}</span>\n <span class=\"pl-s1\">callback</span><span class=\"pl-kos\">(</span><span class=\"pl-kos\">)</span><span class=\"pl-kos\">;</span>\n <span class=\"pl-kos\">}</span><span class=\"pl-kos\">)</span><span class=\"pl-kos\">;</span>\n<span class=\"pl-kos\">}</span><span class=\"pl-kos\">,</span> <span class=\"pl-s1\">err</span> <span class=\"pl-c1\">=&gt;</span> <span class=\"pl-kos\">{</span>\n <span class=\"pl-k\">if</span> <span class=\"pl-kos\">(</span><span class=\"pl-s1\">err</span><span class=\"pl-kos\">)</span> <span class=\"pl-smi\">console</span><span class=\"pl-kos\">.</span><span class=\"pl-en\">error</span><span class=\"pl-kos\">(</span><span class=\"pl-s1\">err</span><span class=\"pl-kos\">.</span><span class=\"pl-c1\">message</span><span class=\"pl-kos\">)</span><span class=\"pl-kos\">;</span>\n <span class=\"pl-c\">// configs is now a map of JSON data</span>\n <span class=\"pl-en\">doSomethingWith</span><span class=\"pl-kos\">(</span><span class=\"pl-s1\">configs</span><span class=\"pl-kos\">)</span><span class=\"pl-kos\">;</span>\n<span class=\"pl-kos\">}</span><span class=\"pl-kos\">)</span><span class=\"pl-kos\">;</span></pre></div>\n<div class=\"highlight highlight-source-js notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"var async = require(&quot;async&quot;);\n\n// ...or ES2017 async functions\nasync.mapLimit(urls, 5, async function(url) {\n const response = await fetch(url)\n return response.body\n}, (err, results) =&gt; {\n if (err) throw err\n // results is now an array of the response bodies\n console.log(results)\n})\"><pre><span class=\"pl-k\">var</span> <span class=\"pl-s1\">async</span> <span class=\"pl-c1\">=</span> <span class=\"pl-en\">require</span><span class=\"pl-kos\">(</span><span class=\"pl-s\">\"async\"</span><span class=\"pl-kos\">)</span><span class=\"pl-kos\">;</span>\n\n<span class=\"pl-c\">// ...or ES2017 async functions</span>\n<span class=\"pl-s1\">async</span><span class=\"pl-kos\">.</span><span class=\"pl-en\">mapLimit</span><span class=\"pl-kos\">(</span><span class=\"pl-s1\">urls</span><span class=\"pl-kos\">,</span> <span class=\"pl-c1\">5</span><span class=\"pl-kos\">,</span> <span class=\"pl-k\">async</span> <span class=\"pl-k\">function</span><span class=\"pl-kos\">(</span><span class=\"pl-s1\">url</span><span class=\"pl-kos\">)</span> <span class=\"pl-kos\">{</span>\n <span class=\"pl-k\">const</span> <span class=\"pl-s1\">response</span> <span class=\"pl-c1\">=</span> <span class=\"pl-k\">await</span> <span class=\"pl-en\">fetch</span><span class=\"pl-kos\">(</span><span class=\"pl-s1\">url</span><span class=\"pl-kos\">)</span>\n <span class=\"pl-k\">return</span> <span class=\"pl-s1\">response</span><span class=\"pl-kos\">.</span><span class=\"pl-c1\">body</span>\n<span class=\"pl-kos\">}</span><span class=\"pl-kos\">,</span> <span class=\"pl-kos\">(</span><span class=\"pl-s1\">err</span><span class=\"pl-kos\">,</span> <span class=\"pl-s1\">results</span><span class=\"pl-kos\">)</span> <span class=\"pl-c1\">=&gt;</span> <span class=\"pl-kos\">{</span>\n <span class=\"pl-k\">if</span> <span class=\"pl-kos\">(</span><span class=\"pl-s1\">err</span><span class=\"pl-kos\">)</span> <span class=\"pl-k\">throw</span> <span class=\"pl-s1\">err</span>\n <span class=\"pl-c\">// results is now an array of the response bodies</span>\n <span class=\"pl-smi\">console</span><span class=\"pl-kos\">.</span><span class=\"pl-en\">log</span><span class=\"pl-kos\">(</span><span class=\"pl-s1\">results</span><span class=\"pl-kos\">)</span>\n<span class=\"pl-kos\">}</span><span class=\"pl-kos\">)</span></pre></div>\n</article>",
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