{"id":103588,"date":"2021-11-22T09:00:56","date_gmt":"2021-11-22T03:30:56","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=103588"},"modified":"2021-11-22T09:58:35","modified_gmt":"2021-11-22T04:28:35","slug":"scaling-nodejs-applications","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/scaling-nodejs-applications\/","title":{"rendered":"Scaling Nodejs Applications"},"content":{"rendered":"<p>In this article, you will get to know how to scale a nodejs application. We have discussed the methods with code and examples for scaling node js application.<\/p>\n<h3>Methods for Scaling Nodejs Applications<\/h3>\n<h4>1. exec() method:<\/h4>\n<p>This method executes a command and it buffers the output.<\/p>\n<h4>Syntax:<\/h4>\n<p>child_process.exec(command[, options], callback)<\/p>\n<h4>Parameter:<\/h4>\n<ul>\n<li>Command:it is the command that you want to run.<\/li>\n<li>Options:it contains the cwd, env, encoding type, uid:<\/li>\n<\/ul>\n<p>a. env (Object) Environment key-value pairs<\/p>\n<p>b. cwd (String) Current working directory of the child process<\/p>\n<p>c. uid (Number) Sets the user identity of the process.<\/p>\n<p>d. gid (Number) Sets the group identity of the process.<\/p>\n<ul>\n<li>Callback: this callback function takes error, stdout, and stderr as arguments.<\/li>\n<\/ul>\n<h4>Example for exec method<\/h4>\n<p>We will be creating two js files, one index file and another child.js file.<br \/>\nWe will run the index.js file; this file will contain instructions to run the child.js file.<\/p>\n<h4>Code for index.js file:<\/h4>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">const child_process = require('child_process');\r\n\r\nfor (let i = 0; i &lt; 2; i++) {\r\nlet process = child_process.exec('node child.js ' + i, function\r\n(error, stdout, stderr) {\r\nconsole.log('stdout: ' + stdout);\r\nconsole.log('stderr: ' + stderr);\r\n});\r\n\r\nprocess.on('exit', function (code) {\r\nconsole.log('Child process exited with code ' + code);\r\n});\r\n}<\/pre>\n<h4>Code for child.js file:<\/h4>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">console.log(\"Child Process \" + process.argv[2] + \" execution completed.\");<\/pre>\n<h4>Output:<\/h4>\n<p><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/10\/nodejs-exec-method.webp\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-103944\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/10\/nodejs-exec-method.webp\" alt=\"nodejs exec method\" width=\"1366\" height=\"702\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/10\/nodejs-exec-method.webp 1366w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/10\/nodejs-exec-method-768x395.webp 768w\" sizes=\"auto, (max-width: 1366px) 100vw, 1366px\" \/><\/a><\/p>\n<h4>2. spawn() method:<\/h4>\n<p>This method will create a new process with the command that you specify.<\/p>\n<h4>Syntax:<\/h4>\n<p>child_process.spawn(command[, args][, options])<\/p>\n<h4>Parameter:<\/h4>\n<ul>\n<li>Command: it is the command that you want to run.<\/li>\n<li>Args: it is an array of arguments.<\/li>\n<li>Options: it contains the cwd, env, uid, gid, etc:<br \/>\na. env (Object) Environment key-value pairs<\/li>\n<\/ul>\n<p>b. cwd (String) Current working directory of the child process<\/p>\n<p>c. uid (Number) Sets the user identity of the process.<\/p>\n<p>d. gid (Number) Sets the group identity of the process.<\/p>\n<h4>Example for spawn() method:<\/h4>\n<p>We will be creating two js files, one index file and another child.js file.<br \/>\nWe will run the index.js file; this file will contain instructions to run the child.js file.<\/p>\n<h4>Code for index.js file:<\/h4>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">const child_process = require('child_process');\r\n\r\nfor (let i = 0; i &lt; 2; i++) {\r\nlet process = child_process.spawn('node', ['child.js', i]);\r\n\r\nprocess.stdout.on('data', function (data) {\r\nconsole.log('stdout: ' + data);\r\n});\r\n\r\nprocess.stderr.on('data', function (data) {\r\nconsole.log('stderr: ' + data);\r\n});\r\n\r\nprocess.on('close', function (code) {\r\nconsole.log('child process exited exit code is ' + code);\r\n});\r\n}<\/pre>\n<h4>Code for child.js file:<\/h4>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">console.log(\"Child Process \" + process.argv[2] + \" execution completed.\");<\/pre>\n<h4>Output:<\/h4>\n<p><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/10\/nodejs-spawn-method.webp\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-103945\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/10\/nodejs-spawn-method.webp\" alt=\"nodejs spawn method\" width=\"1366\" height=\"702\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/10\/nodejs-spawn-method.webp 1366w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/10\/nodejs-spawn-method-768x395.webp 768w\" sizes=\"auto, (max-width: 1366px) 100vw, 1366px\" \/><\/a><\/p>\n<h4>3. fork() method:<\/h4>\n<p>This method is a special case of spawn for creating a new process for the module that you specify.<\/p>\n<h4>Syntax:<\/h4>\n<p>child_process.fork(modulepath[, args][, options])<\/p>\n<h4>Parameter:<\/h4>\n<ul>\n<li>Modulepath: the path of the module that will be executed.<\/li>\n<li>Args: it is an array of arguments.<\/li>\n<li>Options: it contains the cwd,env, uid, gid,etc.<br \/>\na. env (Object) Environment key-value pairs<\/li>\n<\/ul>\n<p>b. cwd (String) Current working directory of the child process<\/p>\n<p>c. uid (Number) Sets the user identity of the process.<\/p>\n<p>d. gid (Number) Sets the group identity of the process.<\/p>\n<h4>Example for fork method:<\/h4>\n<p>We will be creating two js files, one index file and another child.js file.<br \/>\nWe will run the index.js file; this file will contain instructions to run the child.js file.<\/p>\n<h4>Code for index.js file:<\/h4>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">const child_process = require('child_process');\r\n\r\nfor (let i = 0; i &lt; 2; i++) {\r\nlet process = child_process.fork(\"child.js\", [i]);\r\nprocess.on('close', function (code) {\r\nconsole.log('child process terminated with code ' + code);\r\n});\r\n}<\/pre>\n<p>Code for child.js file:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">console.log(\"Child Process \" + process.argv[2] + \" execution completed.\");<\/pre>\n<h4>Output:<\/h4>\n<p><a href=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/10\/nodejs-fork-method.webp\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-103946\" src=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/10\/nodejs-fork-method.webp\" alt=\"nodejs fork method\" width=\"1366\" height=\"702\" srcset=\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/10\/nodejs-fork-method.webp 1366w, https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2021\/10\/nodejs-fork-method-768x395.webp 768w\" sizes=\"auto, (max-width: 1366px) 100vw, 1366px\" \/><\/a><\/p>\n<h3>Conclusion:<\/h3>\n<p>In this article, we have gone through a detailed overview of scaling a nodejs application. We hope you were able to learn.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this article, you will get to know how to scale a nodejs application. We have discussed the methods with code and examples for scaling node js application. Methods for Scaling Nodejs Applications 1.&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":103948,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25259],"tags":[25782],"class_list":["post-103588","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-node-js-tutorials","tag-scaling-nodejs-applications"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Scaling Nodejs Applications - DataFlair<\/title>\n<meta name=\"description\" content=\"Learn about scaling nodejs applications. 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