Edward Jackson

Edward Jackson

1560909711

Build a Command Line Application with Node.js

In this tutorial, you will learn how to create a Command Line Application with Node.js that can be used on Windows, macOS, Linux. You will also learn how to style the output of a Node.js CLI application, accept arguments, and how to authenticate an API from the command line using OAuth 2.0 and PKCE.

Command line applications (CLI) are often the core tools for automating tasks, such as deploying production applications, running tests, building reports, migrating data, DevOps, and the list goes on and on. If you find yourself doing the same things over and over again, chances are you can automate those steps with a script and save yourself a lot of time!

Node.js is a great solution for writing CLI apps. Node.js itself has built-in libraries for reading and writing files, launching other applications, and basic network communication. Beyond that, there are thousands of packages available on npm for just about any kind of task imaginable.

Build Your First Node.js Command Line Application

First, let’s make sure you have the tools required. To complete this tutorial, you will need the following:

Next, open your computer’s command prompt (Windows) or terminal (macOS/Linux). Change the current directory to the folder where you save your documents or projects. Enter the following commands to create a new project folder and initialize the project.

mkdir hello-cli
cd hello-cli
npm init

Next, open the hello-cli folder in your favorite text editor. create a folder named bin and add a new file to the bin folder named index.js. Open the index.js file in your text editor and copy the following code.

#!/usr/bin/env node

console.log( "Hello!" );

The first line that begins with #! is usually called a “shebang.” This is normally only used on Linux or UNIX operating systems to inform the system what type of script is included in the rest of the text file. However, this first line is also required for Node.js scripts to be installed and run properly on macOS and Windows.

Next, open the package.json file in the root of the project in your text editor. Change the main value to bin/index.js. Add a new key for bin with the following text.

 "bin": {
   "hello": "./bin/index.js"
 }

Note: Don’t forget to add a comma after the previous value. All key/value pairs are separated by commas. The most common mistake when editing a JSON file is leaving out a comma.

Your entire package.json file should look similar to the following.

{
 "name": "hello-cli",
 "version": "1.0.0",
 "description": "",
 "main": "bin/index.js",
 "scripts": {
   "test": "echo \"Error: no test specified\" && exit 1"
 },
 "keywords": [],
 "author": "David Neal (https://reverentgeek.com)",
 "license": "MIT",
 "bin": {
   "hello": "./bin/index.js"
 }
}

At this point, you can run the script just like any other Node.js application. Try entering the following from the command line.

node . 

However, the goal of writing a script like this is to be able to run it from anywhere. You can do that with the npm install command.

npm install -g . 

This installs your script “globally.” Any commands listed in the bin section of the package.json file will be made available as command line applications. You can now run your script by typing hello at the command line!

hello 

To uninstall your script, run the following command.

npm uninstall -g hello-cli 

Tip: You can list all globally installed Node.js modules using npm ls -g --depth=0.

Make Text Stand Out with Color and Borders

Writing plain text directly to the console will get the job done, but sometimes it is nice (or even necessary) to have content stand out. For example, you may want to display error messages using the color red.

To modify the color of text and background color, you can use chalk. To add borders around your text to make it more visible, you can use a module named boxen. Add both of these to your project.

npm install chalk@2.4 boxen@4.0 

Next, replace the contents of bin/index.js with the following code.

#!/usr/bin/env node

const chalk = require("chalk");
const boxen = require("boxen");

const greeting = chalk.white.bold("Hello!");

const boxenOptions = {
 padding: 1,
 margin: 1,
 borderStyle: "round",
 borderColor: "green",
 backgroundColor: "#555555"
};
const msgBox = boxen( greeting, boxenOptions );

console.log(msgBox);

Next, install the updated script and run it.

npm install -g .
hello

The message in your console should look similar to this image.

Build a Command Line Application with Node.js

Add Support for Command Line Arguments

Most CLI applications accept one or more command line arguments, such as optional/required parameters, commands, flags/switches, or other configuration values. Although you can parse command line parameters by inspecting the Node.js process.argv value, there are modules available that will save you a lot of time and effort. The yargs module is one such module for Node.js designed to support the most common CLI scenarios.

First, install the yargs module as a dependency for your application.

npm install yargs@13.2 

Next, update the bin/index.js file with the following code.

#!/usr/bin/env node

const yargs = require("yargs");

const options = yargs
 .usage("Usage: -n ")
 .option("n", { alias: "name", describe: "Your name", type: "string", demandOption: true })
 .argv;

const greeting = `Hello, ${options.name}!`;

console.log(greeting);

The previous code imports the yargs module and configures it to require one argument for name. Next, install the updated script globally.

npm install -g . 

The name parameter is required (demandOption: true), so if you try to run the hello script the same as before, you should see something like the following:

> hello

Usage: -n 

Options:
 --help      Show help                                                [boolean]
 --version   Show version number                                      [boolean]
 -n, --name  Your name                                      [string] [required]

Missing required argument: n

The yargs module automatically builds a great response for displaying help! Your CLI is not only ready to accept -n and --name arguments but also --help and --version. Try running your CLI application with any of the arguments.

> hello -n me

Hello, me!

> hello --version

0.1.0

Note: The value displayed for --version comes from the version number in the package.json file.

Call Your Node.js API from the Command Line

A common scenario in automating tasks is to call an API endpoint to get data or to send data to an API endpoint. In this part of the tutorial, you are going to fetch a random joke from a joke API and display it in the console.

One of the most popular libraries for retrieving and sending data to an API in Node.js is axios. Start by adding axios as a dependency.

npm install axios@0.19 

Next, replace the contents of bin/index.js with the following code.

#!/usr/bin/env node

const yargs = require("yargs");
const axios = require("axios");

const options = yargs
 .usage("Usage: -n ")
 .option("n", { alias: "name", describe: "Your name", type: "string", demandOption: true })
 .argv;

const greeting = `Hello, ${options.name}!`;
console.log(greeting);

console.log("Here's a random joke for you:");

const url = "https://icanhazdadjoke.com/";

axios.get(url, { headers: { Accept: "application/json" } })
 .then(res => {
   console.log(res.data.joke);
 });

In addition to responding with a greeting, the CLI application will now retrieve a random joke using axios and display it immediately after the greeting.

Add a Search Argument to Your Node.js Command Line Application

You can take the CLI application one step further by supporting a search argument. Replace the contents of bin/index.js with the following code.

#!/usr/bin/env node

const yargs = require("yargs");
const axios = require("axios");

const options = yargs
 .usage("Usage: -n ")
 .option("n", { alias: "name", describe: "Your name", type: "string", demandOption: true })
 .option("s", { alias: "search", describe: "Search term", type: "string" })
 .argv;

const greeting = `Hello, ${options.name}!`;
console.log(greeting);

if (options.search) {
 console.log(`Searching for jokes about ${options.search}...`)
} else {
 console.log("Here's a random joke for you:");
}

// The url depends on searching or not
const url = options.search ? `https://icanhazdadjoke.com/search?term=${escape(options.search)}` : "https://icanhazdadjoke.com/";

axios.get(url, { headers: { Accept: "application/json" } })
 .then(res => {
   if (options.search) {
     // if searching for jokes, loop over the results
     res.data.results.forEach( j => {
       console.log("\n" + j.joke);
     });
     if (res.data.results.length === 0) {
       console.log("no jokes found :'(");
     }
   } else {
     console.log(res.data.joke);
   }
 });

In the previous code, you added support for a new --search argument. Depending on retrieving a random joke or searching for specific jokes, the code uses a different URL and must handle the results differently.

Try it out!

> npm install -g .
> hello -n me -s orange

Add Support for Secure Authorization with PKCE

An API that requires basic authentication is fairly straight-forward. But, what if an API uses OAuth for authentication? Yes, it is possible to support APIs that use the latest OAuth open standards from the command line, too!

Proof Key for Code Exchange (PKCE) is a better solution for mobile and native applications to exchange private keys with an authorization server. For this step in the tutorial, you are going to use the Okta API. However, it should be possible to adapt the code to work with any OAuth 2.0 service you’re using. Okta is a free-to-use API service for user accounts and simplifies handling user authentication, authorization, social login, password reset, and so forth. Okta utilizes open standards like OAuth 2.0 to make integration seamless.

Create an Okta Application

To get started, go to developer.okta.com and sign up for a free developer account.

Once you are signed in to your account, click on Applications and then click Add Application.

Build a Command Line Application with Node.js

Choose Native as the type of application, and then click Next.

Build a Command Line Application with Node.js

Next, name your application something like My CLI App. Change the Login redirect URIs value to [http://localhost:8080/callback](http://localhost:8080/callback), and then click Done.

Build a Command Line Application with Node.js

Create a file named .env in the root of your CLI project. Open this file and add the following information.

OKTA_ORG_URL=https://{yourOktaOrgUrl}
OKTA_CLIENT_ID={yourClientID}
OKTA_SCOPES="openid profile email"
OKTA_REDIRECT_PORT=8080

Now, if you’re not already at the General Settings page, click on Applications and then click on the name of the application you just created.

Build a Command Line Application with Node.js

Click on the General tab, scroll down to the Client Credentials section, and copy your application’s Client ID. Replace {yourClientID} in the .env file with your application’s Client ID value.

Build a Command Line Application with Node.js

Next, click on the Dashboard link. At the top of the dashboard on the right side of the page you should find your Okta Org URL. Copy this value and put this in your .env file.

Build a Command Line Application with Node.js

Update the Node.js Command Line Application

To support the PKCE authentication flow, your CLI application needs a few more libraries. In this tutorial, you will use hapi to create a web server to handle the authentication callback. dotenv is used to read configuration settings from the .env file. You will use open to launch the default browser for login. And, uuid is used to help generate a unique private key to exchange with the authentication server.

npm install @hapi/hapi@18.3 dotenv@8.0 open@6.3 uuid@3.3 

Now, create a new folder in the root of the project named src. In this folder, create a new file named authClient.js. Add the following code to the src/authClient.js file.

"use strict";

const axios = require( "axios" );
const crypto = require( "crypto" );
const hapi = require( "@hapi/hapi" );
const open = require( "open" );
const querystring = require( "querystring" );
const uuid = require( "uuid/v1" );

const base64url = str => {
 return str.replace( /\+/g, "-" ).replace( /\//g, "_" ).replace( /=+$/, "" );
};
 module.exports = ( { oktaOrgUrl, clientId, scopes, serverPort } ) => {
 if ( !oktaOrgUrl || !clientId || !scopes || !serverPort ) {
   throw new Error( "Okta organization URL, client ID, scopes, and server port are required." );
 }
 // code verifier must be a random string with a minimum of 43 characters
 const codeVerifier = uuid() + uuid();
 const redirectUri = `http://localhost:${serverPort}/callback`;

 const buildAuthorizeUrl = ( codeChallenge ) => {
   const data = {
     client_id: clientId,
     response_type: "code",
     scope: scopes,
     redirect_uri: redirectUri,
     state: uuid(),
     code_challenge_method: "S256",
     code_challenge: codeChallenge
   };
   const params = querystring.stringify( data );
   const authorizeUrl = `${oktaOrgUrl}/oauth2/v1/authorize?${params}`;
   return authorizeUrl;
 };

 const getUserInfo = async accessToken => {
   try {
     const config = {
       headers: { Authorization: `Bearer ${accessToken}` }
     };
     const url = `${oktaOrgUrl}/oauth2/v1/userinfo`;
     const res = await axios.get( url, config );
     return res.data;
   } catch ( err ) {
     console.log( "error getting user info", err ); // eslint-disable-line no-console
     throw err;
   }
 };

 const getToken = async code => {
   try {
     const request = {
       grant_type: "authorization_code",
       redirect_uri: redirectUri,
       client_id: clientId,
       code,
       code_verifier: codeVerifier
     };
     const url = `${oktaOrgUrl}/oauth2/v1/token`;
     const data = querystring.stringify( request );
     const res = await axios.post( url, data );
     return res.data;
   } catch ( err ) {
     console.log( "error getting token", err ); // eslint-disable-line no-console
     throw err;
   }
 };
  // Start server and begin auth flow
 const executeAuthFlow = () => {
   return new Promise( async ( resolve, reject ) => {
     const server = hapi.server( {
       port: serverPort,
       host: "localhost"
     } );

     server.route( {
       method: "GET",
       path: "/callback",
       handler: async request => {
         try {
           const code = request.query.code;
           const token = await getToken( code );
           const userInfo = await getUserInfo( token.access_token );
           resolve( { token, userInfo } );
           return `Thank you, ${userInfo.given_name}. You can close this tab.`;
         } catch ( err ) {
           reject( err );
         } finally {
           server.stop();
         }
       }
     } );
     await server.start();

     const codeChallenge = base64url( crypto.createHash( "sha256" ).update( codeVerifier ).digest( "base64" ) );
     const authorizeUrl = buildAuthorizeUrl( codeChallenge );
     open( authorizeUrl );
   } );
 };
  return {
   executeAuthFlow
 };
};

There’s a lot going on in this module, so here’s a breakdown of how to use the module and what it is doing.

The authClient.js module exports one function that accepts an object with the properties oktaOrgUrl, clientId, scopes, and serverPort. Calling this function will initialize the module with the configuration it needs. After initializing, the function returns an object with exactly one function, executeAuthFlow.

Calling executeAuthFlow goes through the following steps:

  1. A new web server is created using hapi with one /callback route (e.g. [http://localhost:8080/callback](http://localhost:8080/callback)).
  2. The codeVerifier private key is generated and hashed to create the codeChallenge.
  3. The function opens the default browser and navigates to the authorization server.
  4. If not already logged in, the user must log in to the authentication server.
  5. Once authenticated, the browser is redirected to the /callback URL with a code.
  6. The callback handler uses the code and the codeVerifier value to request an authentication token.
  7. The authorization server verifies the code, hashes the codeVerifier and compares it to the codeChallenge value it stored earlier and replies with an authentication token.
  8. The function uses the returned token to call another API endpoint to retrieve account information.
  9. The token and account information are returned to the caller that invoked executeAuthFlow.

Build a Command Line Application with Node.js

Note: Retrieving account information is not part of the PKCE authentication flow. This step is only included as an example of how to use the token once it is acquired!

Next is to update the CLI to use the authClient.js module. Create a new file under bin named pkceLogin.js. Add the following code to the pkceLogin.js file.

#!/usr/bin/env node
"use strict";

const chalk = require( "chalk" );
const dotenv = require( "dotenv" );
const authClient = require( "../src/authClient" );

// read in settings
dotenv.config();

const config = {
 oktaOrgUrl: process.env.OKTA_ORG_URL,
 clientId: process.env.OKTA_CLIENT_ID,
 scopes: process.env.OKTA_SCOPES,
 serverPort: process.env.OKTA_REDIRECT_PORT
};

const main = async () => {
 try {
   const auth = authClient( config );
   const { token, userInfo } = await auth.executeAuthFlow();
   console.log( token, userInfo );
   console.log( chalk.bold( "You have successfully authenticated your CLI application!" ) );
 } catch ( err ) {
   console.log( chalk.red( err ) );
 }
};

main();

Update the package.json file to include another command in the bin section.

 "bin": {
   "hello": "./bin/index.js",
   "pkce-login": "./bin/pkceLogin.js"
 },

Update the CLI applications that are installed globally.

npm install -g . 

Now, you are ready to test your new CLI authentication! After logging in, you should see in your console, You have successfully authenticated your CLI application!

pkce-login 

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Buddha Community

Build a Command Line Application with Node.js

NBB: Ad-hoc CLJS Scripting on Node.js

Nbb

Not babashka. Node.js babashka!?

Ad-hoc CLJS scripting on Node.js.

Status

Experimental. Please report issues here.

Goals and features

Nbb's main goal is to make it easy to get started with ad hoc CLJS scripting on Node.js.

Additional goals and features are:

  • Fast startup without relying on a custom version of Node.js.
  • Small artifact (current size is around 1.2MB).
  • First class macros.
  • Support building small TUI apps using Reagent.
  • Complement babashka with libraries from the Node.js ecosystem.

Requirements

Nbb requires Node.js v12 or newer.

How does this tool work?

CLJS code is evaluated through SCI, the same interpreter that powers babashka. Because SCI works with advanced compilation, the bundle size, especially when combined with other dependencies, is smaller than what you get with self-hosted CLJS. That makes startup faster. The trade-off is that execution is less performant and that only a subset of CLJS is available (e.g. no deftype, yet).

Usage

Install nbb from NPM:

$ npm install nbb -g

Omit -g for a local install.

Try out an expression:

$ nbb -e '(+ 1 2 3)'
6

And then install some other NPM libraries to use in the script. E.g.:

$ npm install csv-parse shelljs zx

Create a script which uses the NPM libraries:

(ns script
  (:require ["csv-parse/lib/sync$default" :as csv-parse]
            ["fs" :as fs]
            ["path" :as path]
            ["shelljs$default" :as sh]
            ["term-size$default" :as term-size]
            ["zx$default" :as zx]
            ["zx$fs" :as zxfs]
            [nbb.core :refer [*file*]]))

(prn (path/resolve "."))

(prn (term-size))

(println (count (str (fs/readFileSync *file*))))

(prn (sh/ls "."))

(prn (csv-parse "foo,bar"))

(prn (zxfs/existsSync *file*))

(zx/$ #js ["ls"])

Call the script:

$ nbb script.cljs
"/private/tmp/test-script"
#js {:columns 216, :rows 47}
510
#js ["node_modules" "package-lock.json" "package.json" "script.cljs"]
#js [#js ["foo" "bar"]]
true
$ ls
node_modules
package-lock.json
package.json
script.cljs

Macros

Nbb has first class support for macros: you can define them right inside your .cljs file, like you are used to from JVM Clojure. Consider the plet macro to make working with promises more palatable:

(defmacro plet
  [bindings & body]
  (let [binding-pairs (reverse (partition 2 bindings))
        body (cons 'do body)]
    (reduce (fn [body [sym expr]]
              (let [expr (list '.resolve 'js/Promise expr)]
                (list '.then expr (list 'clojure.core/fn (vector sym)
                                        body))))
            body
            binding-pairs)))

Using this macro we can look async code more like sync code. Consider this puppeteer example:

(-> (.launch puppeteer)
      (.then (fn [browser]
               (-> (.newPage browser)
                   (.then (fn [page]
                            (-> (.goto page "https://clojure.org")
                                (.then #(.screenshot page #js{:path "screenshot.png"}))
                                (.catch #(js/console.log %))
                                (.then #(.close browser)))))))))

Using plet this becomes:

(plet [browser (.launch puppeteer)
       page (.newPage browser)
       _ (.goto page "https://clojure.org")
       _ (-> (.screenshot page #js{:path "screenshot.png"})
             (.catch #(js/console.log %)))]
      (.close browser))

See the puppeteer example for the full code.

Since v0.0.36, nbb includes promesa which is a library to deal with promises. The above plet macro is similar to promesa.core/let.

Startup time

$ time nbb -e '(+ 1 2 3)'
6
nbb -e '(+ 1 2 3)'   0.17s  user 0.02s system 109% cpu 0.168 total

The baseline startup time for a script is about 170ms seconds on my laptop. When invoked via npx this adds another 300ms or so, so for faster startup, either use a globally installed nbb or use $(npm bin)/nbb script.cljs to bypass npx.

Dependencies

NPM dependencies

Nbb does not depend on any NPM dependencies. All NPM libraries loaded by a script are resolved relative to that script. When using the Reagent module, React is resolved in the same way as any other NPM library.

Classpath

To load .cljs files from local paths or dependencies, you can use the --classpath argument. The current dir is added to the classpath automatically. So if there is a file foo/bar.cljs relative to your current dir, then you can load it via (:require [foo.bar :as fb]). Note that nbb uses the same naming conventions for namespaces and directories as other Clojure tools: foo-bar in the namespace name becomes foo_bar in the directory name.

To load dependencies from the Clojure ecosystem, you can use the Clojure CLI or babashka to download them and produce a classpath:

$ classpath="$(clojure -A:nbb -Spath -Sdeps '{:aliases {:nbb {:replace-deps {com.github.seancorfield/honeysql {:git/tag "v2.0.0-rc5" :git/sha "01c3a55"}}}}}')"

and then feed it to the --classpath argument:

$ nbb --classpath "$classpath" -e "(require '[honey.sql :as sql]) (sql/format {:select :foo :from :bar :where [:= :baz 2]})"
["SELECT foo FROM bar WHERE baz = ?" 2]

Currently nbb only reads from directories, not jar files, so you are encouraged to use git libs. Support for .jar files will be added later.

Current file

The name of the file that is currently being executed is available via nbb.core/*file* or on the metadata of vars:

(ns foo
  (:require [nbb.core :refer [*file*]]))

(prn *file*) ;; "/private/tmp/foo.cljs"

(defn f [])
(prn (:file (meta #'f))) ;; "/private/tmp/foo.cljs"

Reagent

Nbb includes reagent.core which will be lazily loaded when required. You can use this together with ink to create a TUI application:

$ npm install ink

ink-demo.cljs:

(ns ink-demo
  (:require ["ink" :refer [render Text]]
            [reagent.core :as r]))

(defonce state (r/atom 0))

(doseq [n (range 1 11)]
  (js/setTimeout #(swap! state inc) (* n 500)))

(defn hello []
  [:> Text {:color "green"} "Hello, world! " @state])

(render (r/as-element [hello]))

Promesa

Working with callbacks and promises can become tedious. Since nbb v0.0.36 the promesa.core namespace is included with the let and do! macros. An example:

(ns prom
  (:require [promesa.core :as p]))

(defn sleep [ms]
  (js/Promise.
   (fn [resolve _]
     (js/setTimeout resolve ms))))

(defn do-stuff
  []
  (p/do!
   (println "Doing stuff which takes a while")
   (sleep 1000)
   1))

(p/let [a (do-stuff)
        b (inc a)
        c (do-stuff)
        d (+ b c)]
  (prn d))
$ nbb prom.cljs
Doing stuff which takes a while
Doing stuff which takes a while
3

Also see API docs.

Js-interop

Since nbb v0.0.75 applied-science/js-interop is available:

(ns example
  (:require [applied-science.js-interop :as j]))

(def o (j/lit {:a 1 :b 2 :c {:d 1}}))

(prn (j/select-keys o [:a :b])) ;; #js {:a 1, :b 2}
(prn (j/get-in o [:c :d])) ;; 1

Most of this library is supported in nbb, except the following:

  • destructuring using :syms
  • property access using .-x notation. In nbb, you must use keywords.

See the example of what is currently supported.

Examples

See the examples directory for small examples.

Also check out these projects built with nbb:

API

See API documentation.

Migrating to shadow-cljs

See this gist on how to convert an nbb script or project to shadow-cljs.

Build

Prequisites:

  • babashka >= 0.4.0
  • Clojure CLI >= 1.10.3.933
  • Node.js 16.5.0 (lower version may work, but this is the one I used to build)

To build:

  • Clone and cd into this repo
  • bb release

Run bb tasks for more project-related tasks.

Download Details:
Author: borkdude
Download Link: Download The Source Code
Official Website: https://github.com/borkdude/nbb 
License: EPL-1.0

#node #javascript

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1622719015

Why use Node.js for Web Development? Benefits and Examples of Apps

Front-end web development has been overwhelmed by JavaScript highlights for quite a long time. Google, Facebook, Wikipedia, and most of all online pages use JS for customer side activities. As of late, it additionally made a shift to cross-platform mobile development as a main technology in React Native, Nativescript, Apache Cordova, and other crossover devices. 

Throughout the most recent couple of years, Node.js moved to backend development as well. Designers need to utilize a similar tech stack for the whole web project without learning another language for server-side development. Node.js is a device that adjusts JS usefulness and syntax to the backend. 

What is Node.js? 

Node.js isn’t a language, or library, or system. It’s a runtime situation: commonly JavaScript needs a program to work, however Node.js makes appropriate settings for JS to run outside of the program. It’s based on a JavaScript V8 motor that can run in Chrome, different programs, or independently. 

The extent of V8 is to change JS program situated code into machine code — so JS turns into a broadly useful language and can be perceived by servers. This is one of the advantages of utilizing Node.js in web application development: it expands the usefulness of JavaScript, permitting designers to coordinate the language with APIs, different languages, and outside libraries.

What Are the Advantages of Node.js Web Application Development? 

Of late, organizations have been effectively changing from their backend tech stacks to Node.js. LinkedIn picked Node.js over Ruby on Rails since it took care of expanding responsibility better and decreased the quantity of servers by multiple times. PayPal and Netflix did something comparative, just they had a goal to change their design to microservices. We should investigate the motivations to pick Node.JS for web application development and when we are planning to hire node js developers. 

Amazing Tech Stack for Web Development 

The principal thing that makes Node.js a go-to environment for web development is its JavaScript legacy. It’s the most well known language right now with a great many free devices and a functioning local area. Node.js, because of its association with JS, immediately rose in ubiquity — presently it has in excess of 368 million downloads and a great many free tools in the bundle module. 

Alongside prevalence, Node.js additionally acquired the fundamental JS benefits: 

  • quick execution and information preparing; 
  • exceptionally reusable code; 
  • the code is not difficult to learn, compose, read, and keep up; 
  • tremendous asset library, a huge number of free aides, and a functioning local area. 

In addition, it’s a piece of a well known MEAN tech stack (the blend of MongoDB, Express.js, Angular, and Node.js — four tools that handle all vital parts of web application development). 

Designers Can Utilize JavaScript for the Whole Undertaking 

This is perhaps the most clear advantage of Node.js web application development. JavaScript is an unquestionable requirement for web development. Regardless of whether you construct a multi-page or single-page application, you need to know JS well. On the off chance that you are now OK with JavaScript, learning Node.js won’t be an issue. Grammar, fundamental usefulness, primary standards — every one of these things are comparable. 

In the event that you have JS designers in your group, it will be simpler for them to learn JS-based Node than a totally new dialect. What’s more, the front-end and back-end codebase will be basically the same, simple to peruse, and keep up — in light of the fact that they are both JS-based. 

A Quick Environment for Microservice Development 

There’s another motivation behind why Node.js got famous so rapidly. The environment suits well the idea of microservice development (spilling stone monument usefulness into handfuls or many more modest administrations). 

Microservices need to speak with one another rapidly — and Node.js is probably the quickest device in information handling. Among the fundamental Node.js benefits for programming development are its non-obstructing algorithms.

Node.js measures a few demands all at once without trusting that the first will be concluded. Many microservices can send messages to one another, and they will be gotten and addressed all the while. 

Versatile Web Application Development 

Node.js was worked in view of adaptability — its name really says it. The environment permits numerous hubs to run all the while and speak with one another. Here’s the reason Node.js adaptability is better than other web backend development arrangements. 

Node.js has a module that is liable for load adjusting for each running CPU center. This is one of numerous Node.js module benefits: you can run various hubs all at once, and the environment will naturally adjust the responsibility. 

Node.js permits even apportioning: you can part your application into various situations. You show various forms of the application to different clients, in light of their age, interests, area, language, and so on. This builds personalization and diminishes responsibility. Hub accomplishes this with kid measures — tasks that rapidly speak with one another and share a similar root. 

What’s more, Node’s non-hindering solicitation handling framework adds to fast, letting applications measure a great many solicitations. 

Control Stream Highlights

Numerous designers consider nonconcurrent to be one of the two impediments and benefits of Node.js web application development. In Node, at whatever point the capacity is executed, the code consequently sends a callback. As the quantity of capacities develops, so does the number of callbacks — and you end up in a circumstance known as the callback damnation. 

In any case, Node.js offers an exit plan. You can utilize systems that will plan capacities and sort through callbacks. Systems will associate comparable capacities consequently — so you can track down an essential component via search or in an envelope. At that point, there’s no compelling reason to look through callbacks.

 

Final Words

So, these are some of the top benefits of Nodejs in web application development. This is how Nodejs is contributing a lot to the field of web application development. 

I hope now you are totally aware of the whole process of how Nodejs is really important for your web project. If you are looking to hire a node js development company in India then I would suggest that you take a little consultancy too whenever you call. 

Good Luck!

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Vincent Lab

Vincent Lab

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How to Create a Command Line (CLI) Tool in Node.js

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