{"id":2921,"date":"2021-03-25T17:35:29","date_gmt":"2021-03-25T16:35:29","guid":{"rendered":"https:\/\/visionslabs.io\/nestjs-backend-framework-for-web-applications\/"},"modified":"2021-03-29T21:56:41","modified_gmt":"2021-03-29T19:56:41","slug":"nestjs-backend-framework-for-web-applications","status":"publish","type":"post","link":"https:\/\/visionslabs.io\/en\/nestjs-backend-framework-for-web-applications\/","title":{"rendered":"NestJS &#8211; backend framework for web applications"},"content":{"rendered":"\n<p>We have recently published an old-new reference on the <a href=\"https:\/\/visionslabs.io\/reference\/centrum-vzdelavani-cz-informacni-system-pro-vzdelavaci-spolecnost\/\" target=\"_blank\" rel=\"noreferrer noopener\">Information System for CENTRUM-VZD\u011aL\u00c1V\u00c1N\u00cd.CZ<\/a> and in this information system, resp. <a href=\"https:\/\/visionslabs.io\/sluzby\/tvorba-webovych-aplikaci\/\">web application<\/a>, we used the <strong>NodeJS<\/strong> framework as a backend part &#8211; specifically <strong>NestJS<\/strong>.<\/p>\n\n<h2 class=\"wp-block-heading\">NestJS<\/h2>\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-full is-resized\"><a href=\"https:\/\/nestjs.com\/\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"https:\/\/visionslabs.io\/wp-content\/uploads\/2021\/03\/nest-js-logo.svg\" alt=\"Nest JS - node js framework\" class=\"wp-image-2846\" width=\"150\" height=\"150\"\/><\/a><figcaption>Nest JS &#8211; progressive Node.js framework<\/figcaption><\/figure><\/div>\n\n<p>Let&#8217;s&nbsp;first say what <a href=\"https:\/\/nestjs.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">NestJS<\/a> is. It is a progressive <a href=\"https:\/\/nodejs.org\/en\/\" target=\"_blank\" rel=\"noreferrer noopener\">Node.js<\/a> framework for creating efficient, reliable and scalable server-side applications. In other words, it is a framework for creating back-end applications. The basic characteristics of <strong>NestJS<\/strong> include that <strong><a href=\"https:\/\/www.typescriptlang.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">TypeScript<\/a><\/strong> is used and the code structure is very similar to <strong><a href=\"https:\/\/angular.io\/\">Angular<\/a><\/strong>. It is clear from these indications that <strong>NestJS<\/strong> is an ideal backend framework for developers who already have experience with <strong>Angular<\/strong>, as they can use their knowledge of frontend development in <strong>TypeScript<\/strong>.<\/p>\n\n<p>Another important aspect is the excellent documentation and a lively community. For example, if we wanted to compare with the <em>PHP framework Apigility<\/em>, which we used before, it can not even be compared &#8211; really &#8220;0 and 100&#8221;. <strong>NestJS<\/strong> is well documented at<a href=\"https:\/\/docs.nestjs.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/docs.nestjs.com\/,<\/a> where in addition to &#8220;theory&#8221; there are also best practices. And the community is active on the <a href=\"https:\/\/discord.gg\/G7Qnnhy\" target=\"_blank\" rel=\"noreferrer noopener\">Discord<\/a> platform. It is interesting that the <strong>NestJS<\/strong> framework comes from our &#8220;neighbors&#8221; in Poland and is backed by <strong><a href=\"https:\/\/trilon.io\/\" target=\"_blank\" rel=\"noreferrer noopener\">Trilon<\/a><\/strong>.<\/p>\n\n<h3 class=\"wp-block-heading\">Code sample from https:\/\/nestjs.com\/<\/h3>\n\n<iframe src=\"https:\/\/codesandbox.io\/embed\/nest-jjo90y00xw?autoresize=1&#038;fontsize=14&#038;hidenavigation=1&#038;module=%2Fsrc%2Fapp.controller.ts&#038;theme=dark&#038;view=editor\" style=\"width:100%; height:500px; border:0; border-radius: 4px; overflow:hidden;\" title=\"Nest \" allow=\"accelerometer; ambient-light-sensor; camera; encrypted-media; geolocation; gyroscope; hid; microphone; midi; payment; usb; vr; xr-spatial-tracking\" sandbox=\"allow-forms allow-modals allow-popups allow-presentation allow-same-origin allow-scripts\"><\/iframe>\n\n<h2 class=\"wp-block-heading\">Other characteristics<\/h2>\n\n<ul class=\"wp-block-list\"><li>NestJS also includes a built-in <strong>CLI<\/strong>, which can save programmers a lot of work when creating code, where for example the very useful command &#8220;<em>nest g recourses NAME<\/em>&#8221; creates the entire boilerplate code for the CRUD endpoint.<\/li><li>The default HTTP server is <a href=\"https:\/\/expressjs.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">Express<\/a>, but there is an option to switch to <a href=\"https:\/\/github.com\/fastify\/fastify\" target=\"_blank\" rel=\"noreferrer noopener\">Fastify<\/a>.<\/li><li>In terms of databases, it works with both <strong>SQL<\/strong> and <strong>noSQL<\/strong> servers. So you can use both MySQL and <a href=\"https:\/\/www.mongodb.com\/\">MongoDB<\/a>, for example.<\/li><li>It can be used with various libraries such as <strong>TypeORM<\/strong>, <strong>Prisma<\/strong> or <strong>Swagger<\/strong>.<\/li><li>It is not a problem to use NestJS as a <strong>REST API<\/strong> or <strong>GraphQL API<\/strong>.<\/li><\/ul>\n\n<h2 class=\"wp-block-heading\">NestJS code structure<\/h2>\n\n<p><strong>NestJS<\/strong> framework for the &#8220;invisible&#8221; part of the web application, ie. backend, consists mainly of &#8220;<strong><a href=\"https:\/\/docs.nestjs.com\/controllers\" target=\"_blank\" rel=\"noreferrer noopener\">controllers<\/a><\/strong>&#8220;, which are individual end-points, which are marked by annotation, ie. eg <em>@get (&#8220;home&#8221;)<\/em>, or <em>@post (&#8220;car \/: id&#8221;)<\/em>, which indicates a parameterized endpoint. So the code is also very clear thanks to the fact that the <strong>controllers<\/strong> usually only call specific <strong>services<\/strong>, where the logic of the application itself is. <\/p>\n\n<p><a href=\"https:\/\/docs.nestjs.com\/security\/authentication\" target=\"_blank\" rel=\"noreferrer noopener\">Authentication<\/a> is solved using a strategy where we can use templates of standardized processes, such as JWT (Json Web Token). For subsequent <a href=\"https:\/\/docs.nestjs.com\/security\/authorization\" target=\"_blank\" rel=\"noreferrer noopener\">authorization<\/a> and ensuring control of access to individual endpoints, <strong>guards<\/strong>, resp. annotation <em>@Roles ().<\/em><\/p>\n\n<h2 class=\"wp-block-heading\">Basic course directly from the creators of NestJS<\/h2>\n\n<p>What we can definitely recommend is an online course in the form of pre-recorded videos directly from the creators of NestJS. You can find the video course at <a href=\"https:\/\/courses.nestjs.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/courses.nestjs.com\/<\/a>, where you can currently get about 5 hours of content for $ 89. <\/p>\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-us_600_400\"><a ref=\"magnificPopup\" href=\"https:\/\/visionslabs.io\/wp-content\/uploads\/2021\/03\/NestJS-webove-aplikace-ukazak-z-video-kurzu.png\"><img decoding=\"async\" width=\"600\" height=\"335\" src=\"https:\/\/visionslabs.io\/wp-content\/uploads\/2021\/03\/NestJS-webove-aplikace-ukazak-z-video-kurzu-600x335.png\" alt=\"NestJS web applications - sample from the video course\" class=\"wp-image-2906\" srcset=\"https:\/\/visionslabs.io\/wp-content\/uploads\/2021\/03\/NestJS-webove-aplikace-ukazak-z-video-kurzu-600x335.png 600w, https:\/\/visionslabs.io\/wp-content\/uploads\/2021\/03\/NestJS-webove-aplikace-ukazak-z-video-kurzu-300x167.png 300w, https:\/\/visionslabs.io\/wp-content\/uploads\/2021\/03\/NestJS-webove-aplikace-ukazak-z-video-kurzu-1024x572.png 1024w, https:\/\/visionslabs.io\/wp-content\/uploads\/2021\/03\/NestJS-webove-aplikace-ukazak-z-video-kurzu.png 1141w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><figcaption>Public sample from the video course from the website https:\/\/courses.nestjs.com\/<\/figcaption><\/figure><\/div>\n\n<h2 class=\"wp-block-heading\">Run the NestJS application on your own server<\/h2>\n\n<p>Finally, we can summarize how to run applications on your own server, because according to a survey on the Internet, this is no longer so common. A more common solution is to run on the <em>Google Cloud Platform<\/em>, <em>Amazon Web Services<\/em> or another cloud platform to run &#8220;Internet&#8221;. To run the Node.js application, so even the NestJS application on the linux server, the <a href=\"https:\/\/pm2.keymetrics.io\/\" target=\"_blank\" rel=\"noreferrer noopener\">PM2<\/a> application is needed.<\/p>\n\n<ul class=\"wp-block-list\"><li>installation of PM2 on Linux, provided that Node and NPM are already on the server &#8211; <code><strong>npm install pm2 -g<\/strong><\/code><\/li><li>compiling an application for production launch &#8211; <code><strong>npm run build<\/strong><\/code><\/li><li>launch the application using PM2 &#8211; <code><strong>pm2 start main.js --name MY_NAME<\/strong><\/code><\/li><\/ul>\n\n<p>And then we can show a simple template for setting up an Apache2 virtual host, with PORT_NUMBER being the port number under which you run the NestJS application.<\/p>\n\n<pre class=\"wp-block-code\"><code>&lt;VirtualHost *:80&gt;\n  ServerName domain.com\n\n  ProxyPreserveHost On\n  ProxyPass \/ http:\/\/localhost:PORT_NUMBER\/\n  ProxyPassReverse \/ http:\/\/localhost:PORT_NUMBER\/\n&lt;\/VirtualHost&gt;<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>We have recently published an old-new reference on the Information System for CENTRUM-VZD\u011aL\u00c1V\u00c1N\u00cd.CZ and in this information system, resp. web application, we used the NodeJS framework as a backend part &#8211; specifically NestJS. NestJS Let&#8217;s&nbsp;first say what NestJS is. It is a progressive Node.js framework for creating efficient, reliable and scalable server-side applications. In other&#8230;<\/p>\n","protected":false},"author":1,"featured_media":2916,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[206,241],"tags":[242,255,253,243,258,251,245,247,256,244,249],"class_list":["post-2921","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-interesting-facts","category-web-applications","tag-angular-en","tag-apache2-en-2","tag-express-en-2","tag-graphql-en","tag-mongodb-en-2","tag-mysql-en-2","tag-nestjs-en","tag-node-js-en-2","tag-pm2-en","tag-rest-api-en","tag-typescript-en-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NestJS - backend framework for web applications - visionslabs<\/title>\n<meta name=\"description\" content=\"NestJS is a Node.js framework for writing backend web applications with the possibility of writing in TypeScript and using the principle from Angular.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/visionslabs.io\/en\/nestjs-backend-framework-for-web-applications\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NestJS - backend framework for web applications - visionslabs\" \/>\n<meta property=\"og:description\" content=\"NestJS is a Node.js framework for writing backend web applications with the possibility of writing in TypeScript and using the principle from Angular.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/visionslabs.io\/en\/nestjs-backend-framework-for-web-applications\/\" \/>\n<meta property=\"og:site_name\" content=\"visionslabs\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/facebook.com\/visionslabs\/\" \/>\n<meta property=\"article:published_time\" content=\"2021-03-25T16:35:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-03-29T19:56:41+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/visionslabs.io\/wp-content\/uploads\/2021\/03\/visionslabs-NestJS-backend-framework-pro-webove-aplikace.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Leopold Podmol\u00edk\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@visionslabs\" \/>\n<meta name=\"twitter:site\" content=\"@visionslabs\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Leopold Podmol\u00edk\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/visionslabs.io\/en\/nestjs-backend-framework-for-web-applications\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/visionslabs.io\/en\/nestjs-backend-framework-for-web-applications\/\"},\"author\":{\"name\":\"Leopold Podmol\u00edk\",\"@id\":\"https:\/\/visionslabs.io\/en\/#\/schema\/person\/8002ebaef6052f50e66a94371d7764c9\"},\"headline\":\"NestJS &#8211; 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