Cristian Vasta

Cristian Vasta

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Design patterns in Node.js: a practical guide

Design patterns are part of the day to day of any software developer, whether they realize it or not.

In this article, we will look at how to identify these patterns out in the wild and look at how you can start using them in your own projects.

What are design patterns?

Design patterns, simply put, are a way for you to structure your solution’s code in a way that allows you to gain some kind of benefit. Such as faster development speed, code reusability, and so on.

All patterns lend themselves quite easily to the OOP paradigm. Although given JavaScript’s flexibility, you can implement these concepts in non-OOP projects as well.

When it comes to design patterns, there are way too many of them to cover in just one article, in fact, books have been written exclusively about this topic and every year new patterns are created, leaving their lists incomplete.

A very common classification for the pattern is the one used in the GoF book (The Gang of Four Book) but since I’m going to be reviewing just a handful of them, I will ignore the classification and simply present you with a list of patterns you can see and start using in your code right now.

Immediately Invoked Function Expressions (IIFE)

The first pattern I’m going to show you is one that allows you to define and call a function at the same time. Due to the way JavaScript scopes works, using IIFEs can be great to simulate things like private properties in classes. In fact, this particular pattern is sometimes used as part of the requirements of other, more complex ones. We’ll see how in a bit.

What does an IIFE look like?

But before we delve into the use cases and the mechanics behind it, let me quickly show you what it looks like exactly:

(function() {
   var x = 20;
   var y = 20;
   var answer = x + y;
   console.log(answer);
})();

By pasting the above code into a Node.js REPL or even your browser’s console, you’d immediately get the result because, as the name suggests, you’re executing the function as soon as you define it.

The template for an IIFE consists of an anonymous function declaration, inside a set of parenthesis (which turn the definition into a function expression, a.k.a an assignment) and then a set of calling parenthesis at the end tail of it. Like so:

(function(/*received parameters*/) {
//your code here
})(/*parameters*/)

Use cases

Although it might sound crazy, there are actually a few benefits and use cases where using an IIFE can be a good thing, for example:

Simulating static variables

Remember static variables? From other languages such as C or C# for example. If you’re not familiar with them, a static variable gets initialized the first time you use it, and then it takes the value that you last set it to. The benefit being that if you define a static variable inside a function, that variable will be common to all instances of the function, no matter how many times you call it, so it greatly simplifies cases like this:

function autoIncrement() {
    static let number = 0
    number++
    return number
}

The above function would return a new number every time we call it (assuming, of course, the static keyword is available for us in JS). We could do this with generators in JS, that’s true, but pretend we don’t have access to them, you could simulate a static variable like this:

let autoIncrement = (function() {
    let number = 0

    return function () {
     number++
     return number
    }
})()

What you’re seeing in there, is the magic of closures all wrapped up inside an IIFE. Pure magic. You’re basically returning a new function that will be assigned to the autoIncrement variable (thanks to the actual execution of the IIFE). And with the scoping mechanics of JS, your function will always have access to the number variable (as if it were a global variable).

Simulating private variables

As you may (or may not, I guess) already know, ES6 classes treat every member as public, meaning, there are no private properties or methods. That’s out of the question, but thanks to IIFEs you could potentially simulate that if you wanted to.

const autoIncrementer = (function() {
  let value = 0;

  return {
    incr() {
        value++
    },
    get value() {
        return value
    }
  };
})();
> autoIncrementer.incr()
undefined
> autoIncrementer.incr()
undefined
> autoIncrementer.value
2
> autoIncrementer.value = 3
3
> autoIncrementer.value
2

The above code shows you a way to do it. Although you’re not specifically defining a class which you can instantiate afterwards, mind you, you are defining a structure, a set of properties and methods which can make use of variables that are common to the object you’re creating, but that are not accessible (as shown through the failed assignment) from outside.

Factory method pattern

This one, in particular, is one of my favourite patterns, since it acts as a tool you can implement to clean your code up a bit.

In essence, the factory method allows you to centralize the logic of creating objects (meaning, which object to create and why) in a single place. This allows you to forget about that part and focus on simply requesting the object you need and then using it.

This might seem like a small benefit, but bear with me for a second, it’ll make sense, trust me.

What does the factory method pattern look like?

This particular pattern would be easier to understand if you first look at its usage, and then at its implementation.

Here is an example:

( _ => {

    let factory = new MyEmployeeFactory()
    let types = ["fulltime", "parttime", "contractor"]
    let employees = [];
    for(let i = 0; i < 100; i++) {
     employees.push(factory.createEmployee({type: types[Math.floor( (Math.random(2) * 2) )]})    )}
    
    //....
    employees.forEach( e => {
     console.log(e.speak())
    })
})()

The key takeaway from the above code is the fact that you’re adding objects to the same array, all of which share the same interface (in the sense they have the same set of methods) but you don’t really need to care about which object to create and when to do it.

You can now look at the actual implementation, as you can see, there is a lot to look at, but it’s quite straightforward:

class Employee {

    speak() {
     return "Hi, I'm a " + this.type + " employee"
    }
}
class FullTimeEmployee extends Employee{
    constructor(data) {
     super()
     this.type = "full time"
     //....
    }
}
class PartTimeEmployee extends Employee{
    constructor(data) {
     super()
     this.type = "part time"
     //....
    }
}
class ContractorEmployee extends Employee{
    constructor(data) {
     super()
     this.type = "contractor"
     //....
    }
}
class MyEmployeeFactory {
    createEmployee(data) {
     if(data.type == 'fulltime') return new FullTimeEmployee(data)
     if(data.type == 'parttime') return new PartTimeEmployee(data)
     if(data.type == 'contractor') return new ContractorEmployee(data)
    }
}

Use case

The previous code already shows a generic use case, but if we wanted to be more specific, one particular use case I like to use this pattern for is handling error object creation.

Imagine having an Express application with about 10 endpoints, wherein every endpoint you need to return between two to three errors based on the user input. We’re talking about 30 sentences like the following:

if(err) {
  res.json({error: true, message: “Error message here”})
}

Now, that wouldn’t be a problem, unless of course, until the next time you had to suddenly add a new attribute to the error object. Now you have to go over your entire project, modifying all 30 places. And that would be solved by moving the definition of the error object into a class. That would be great unless of course, you had more than one error object, and again, you’re having to decide which object to instantiate based on some logic only you know. See where I’m trying to get to?

If you were to centralize the logic for creating the error object then all you’d have to do throughout your code would be something like:

if(err) {
  res.json(ErrorFactory.getError(err))
}

That is it, you’re done, and you never have to change that line again.

Singleton pattern

This one is another oldie but a goodie. It’s quite a simple pattern, mind you, but it helps you keep track of how many instances of a class you’re instantiating. Actually, it helps you keep that number to just one, all of the time. Mainly, the singleton pattern, allows you to instantiate an object once, and then use that one every time you need it, instead of creating a new one without having to keep track of a reference to it, either globally or just passing it as a dependency everywhere.

What does the singleton pattern look like?

Normally, other languages implement this pattern using a single static property where they store the instance once it exists. The problem here is that, as I mentioned before, we don’t have access to static variables in JS. So we could implement this in two ways, one would be by using IIFEs instead of classes.

The other would be by using ES6 modules and having our singleton class using a locally global variable, in which to store our instance. By doing this, the class itself gets exported out of the module, but the global variable remains local to the module.

I know, but trust me, it sounds a lot more complicated than it looks:

let instance = null

class SingletonClass {
    constructor() {
     this.value = Math.random(100)
    }
    printValue() {
     console.log(this.value)
    }
    static getInstance() {
     if(!instance) {
         instance = new SingletonClass()
     }
     return instance
    }
}
module.exports = SingletonClass

And you could use it like this:

const Singleton = require(“./singleton”)

const obj = Singleton.getInstance()
const obj2 = Singleton.getInstance()

obj.printValue()
obj2.printValue()
console.log("Equals:: ", obj === obj2)

The output of course being:

0.5035326348000628
0.5035326348000628
Equals::  true

Confirming that indeed, we’re only instantiating the object once, and returning the existing instance.

Use cases

When trying to decide if you need a singleton-like implementation or not, you need to consider something: how many instances of your classes will you really need? If the answer is 2 or more, then this is not your pattern.

But there might be times when having to deal with database connections that you might want to consider it.

Think about it, once you’ve connected to your database, it might be a good idea to keep that connection alive and accessible throughout your code. Mind you, this can be solved in a lot of different ways, yes, but this pattern is indeed, one of them.

Using the above example, we can extrapolate it into something like this:

const driver = require("...")

let instance = null
class DBClass {
    constructor(props) {
     this.properties = props
     this._conn = null
    }
    connect() {
     this._conn = driver.connect(this.props)
    }
    get conn() {
     return this._conn
    }
    static getInstance() {
     if(!instance) {
         instance = new DBClass()
     }
     return instance
    }
}
module.exports = DBClass

And now, you’re sure that no matter where you are if you’re using the getInstance method, you’ll be returning the only active connection (if any).

Observer pattern

This one is a very interesting pattern, in the sense that it allows you to respond to certain input by being reactive to it, instead of proactively checking if the input is provided. In other words, with this pattern, you can specify what kind of input you’re waiting for and passively wait until that input is provided in order to execute your code. It’s a set and forget kind of deal, if you will.

In here, the observers are your objects, which know the type of input they want to receive and the action to respond with, these are meant to “observe” another object and wait for it to communicate with them.

The observable, on the other hand, will let the observers know when a new input is available, so they can react to it, if applicable. If this sounds familiar, it’s because it is, anything that deals with events in Node is implementing this pattern.

What does the observer pattern look like?

Have you ever written your own HTTP server? Something like this:

const http = require('http');

const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Your own server here');
});
server.on('error', err => {
    console.log(“Error:: “, err)
})
server.listen(3000, '127.0.0.1', () => {
  console.log('Server up and running');
});

There, hidden in the above code, you’re looking at the observer pattern in the wild. An implementation of it, at least. Your server object would act as the observable, whilst your callback function is the actual observer. The event-like interface here (see the bolded code), with the on method, and the event name there might obfuscate the view a bit, but consider the following implementation:

class Observable {

    constructor() {
     this.observers = {}
    }
    on(input, observer) {
     if(!this.observers[input]) this.observers[input] = []
     this.observers[input].push(observer)
    }
    triggerInput(input, params) {
     this.observers[input].forEach( o => {
         o.apply(null, params)    
     })
    }
}
class Server extends Observable {
    constructor() {
     super()
    }
    triggerError() {
     let errorObj = {
         errorCode: 500,
         message: 'Port already in use'
     }
     this.triggerInput('error', [errorObj])
    }
}

You can now, again, set the same observer, in exactly the same way:

server.on('error', err => {
    console.log(“Error:: “, err)
})

And if you were to call the “triggerError” method (which is there to show you how you would let your observers know that there is new input for them), you’d get the exact same output:

Error:: { errorCode: 500, message: 'Port already in use' }

If you were to be considering using this pattern in Node.js, please look at the EventEmitter object first, since it’s Node.js’ own implementation of this pattern, and might save you some time.

Use cases

This pattern is, as you might have already guessed, great for dealing with asynchronous calls, since getting the response from an external request can be considered a new input. And what do we have in Node.js, if not a constant influx of asynchronous code into our projects? So next time you’re having to deal with an async scenario consider looking into this pattern.

Another widely spread use case for this pattern, as you’ve seen, is that of triggering particular events. This pattern can be found on any module that is prone to having events triggered asynchronously (such as errors or status updates). Some examples are the HTTP module, any database driver, and even socket.io, which allows you to set observers on particular events triggered from outside your own code.

Chain of responsibility

The chain of responsibility pattern is one that many of use in the world of Node.js have used, without even realizing it.

It consists of structuring your code in a way that allows you to decouple the sender of a request with the object that can fulfil it. In other words, having to object A sending request R, you might have three different receiving objects R1, R2, and R3, how can A know which one it should send R to? Should A care about that?

The answer to the last question is: no, it shouldn’t. So instead, if A shouldn’t care about who’s going to take care of the request, why don’t we let R1, R2 and R3 decide by themselves?

Here is where the chain of responsibility comes into play, we’re creating a chain of receiving objects, which will try to fulfil the request and if they can’t, they’ll just pass it along. Does it sound familiar yet?

What does the chain of responsibility look like?

Here is a very basic implementation of this pattern, as you can see at the bottom, we have four possible values (or requests) that we need to process, but we don’t care who gets to process them, we just need, at least, one function to use them, hence we just send it to the chain and let each one decide whether they should use it or ignore it.

function processRequest(r, chain) {

    let lastResult = null
    let i = 0
    do {
     lastResult = chain[i](r)
     i++
    } while(lastResult != null && i < chain.length)
    if(lastResult != null) {
     console.log("Error: request could not be fulfilled")
    }
}
let chain = [
    function (r) {
     if(typeof r == 'number') {
         console.log("It's a number: ", r)
         return null
     }
     return r
    },
    function (r) {
     if(typeof r == 'string') {
         console.log("It's a string: ", r)
         return null
     }
     return r
    },
    function (r) {
     if(Array.isArray(r)) {
         console.log("It's an array of length: ", r.length)
         return null
     }
     return r
    }
]
processRequest(1, chain)
processRequest([1,2,3], chain)
processRequest('[1,2,3]', chain)
processRequest({}, chain)

The output being:

It's a number:  1
It's an array of length:  3
It's a string:  [1,2,3]
Error: request could not be fulfilled

Use cases

The most obvious case of this pattern in our ecosystem is the middlewares for ExpressJS. With that pattern, you’re essentially setting up a chain of functions (middlewares) that evaluate the request object and decide to act on it or ignore it. You can think of that pattern as the asynchronous version of the above example, where instead of checking if the function returns a value or not, you’re checking what values are passed to the next callback they call.

var app = express();

app.use(function (req, res, next) {
  console.log('Time:', Date.now());
  next(); //call the next function on the chain
});

Middlewares are a particular implementation of this pattern since instead of only one member of the chain fulfilling the request, one could argue that all of them could do it. Nevertheless, the rationale behind it is the same.

Final thoughts

These are but a few patterns that you might run into daily without even realizing it. I’d encourage you to look into the rest of them, even if you don’t find an immediate use case, now that I’ve shown you how some of them look in the wild, you might start seeing them yourselves! Hopefully, this article has shed some light on this subject and helps you improve your coding-foo faster than ever. See you on the next one!

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Design patterns in Node.js: a practical guide

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

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Hire Dedicated Node.js Developers - Hire Node.js Developers

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Aria Barnes

Aria Barnes

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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Node JS Development Company| Node JS Web Developers-SISGAIN

Top organizations and start-ups hire Node.js developers from SISGAIN for their strategic software development projects in Illinois, USA. On the off chance that you are searching for a first rate innovation to assemble a constant Node.js web application development or a module, Node.js applications are the most appropriate alternative to pick. As Leading Node.js development company, we leverage our profound information on its segments and convey solutions that bring noteworthy business results. For more information email us at hello@sisgain.com

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Top 10 NodeJs app Development Companies- ValueCoders

Node.js is a prominent tech trend in the space of web and mobile application development. It has been proven very efficient and useful for a variety of application development. Thus, all business owners are eager to leverage this technology for creating their applications.

Are you striving to develop an application using Node.js? But can’t decide which company to hire for NodeJS app development? Well! Don’t stress over it, as the following list of NodeJS app development companies is going to help you find the best partner.

Let’s take a glance at top NodeJS application development companies to hire developers in 2021 for developing a mind-blowing application solution.

Before enlisting companies, I would like to say that every company has a foundation on which they thrive. Their end goals, qualities, and excellence define their competence. Thus, I prepared this list by considering a number of aspects. While making this list, I have considered the following aspects:

  • Review and rating
  • Enlisted by software peer & forums
  • Hourly price
  • Offered services
  • Year of experience (Average 8+ years)
  • Credibility & Excellence
  • Served clients and more

I believe this list will help you out in choosing the best NodeJS service provider company. So, now let’s explore the top NodeJS developer companies to choose from in 2021.

#1. JSGuru

JSGuru is a top-rated NodeJS app development company with an innovative team of dedicated NodeJS developers engaged in catering best-class UI/UX design, software products, and AWS professional services.

It is a team of one of the most talented developers to hire for all types of innovative solution development, including social media, dating, enterprise, and business-oriented solutions. The company has worked for years with a number of startups and launched a variety of products by collaborating with big-name corporations like T-systems.

If you want to hire NodeJS developers to secure an outstanding application, I would definitely suggest them. They serve in the area of eLearning, FinTech, eCommerce, Telecommunications, Mobile Device Management, and more.

  • Ratings: 4.9/5.0

  • Founded: 2006

  • Headquarters: Banja Luka, Bosnia, and Herzegovina

  • Price: Starting from $50/hour

Visit Website - https://www.valuecoders.com/blog/technology-and-apps/top-node-js-app-development-companies

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