Node.js 12 - The future of Server-side JavaScript

Introduction

Node.js has been a game-changing technology since its initial release back in 2009. In a nutshell, it lets developers use JavaScript to run scripts on the server side producing dynamic web content before the page is sent to the user’s web browser. Consequently, Node.js represents a “JavaScript everywhere” paradigm, unifying web application development around a single programming language, rather than needing different languages for server-side and client-side scripts.

If you’re a fan of JavaScript and Node.js, like I am, you’ll be excited to know it’s about to get a whole lot better.

Node 12 new & improved

Why is JavaScript about to get a lot better? Node.js 12 just dropped a few months ago.

On April 23rd, 2019, Node.js 12 officially launched, and JavaScript enthusiasts everywhere rejoiced. And let’s be clear, this isn’t just a regular old version update, this is a big overhaul with some major upgrades, let’s go down the list of highlights.

V8 JavaScript engine upgrades

In addition to the expected performance tweaks and improvements that come with every new version of the JavaScript V8 engine, there are some really noteworthy upgrades this time around. These include:

  • Zero-cost async stack traces – this will serve to enrich the error.stackproperty with asynchronous call frames without adding extra runtime to the V8 engine
  • Faster calls with arguments mismatch – in the past, V8 had to handle all function calls with too many or too few parameters the same way, which came at a performance cost. Now, it’s smart enough to know when it can skip this step, reducing call overhead up to 60%
  • Faster async functions and promises – yes indeed, using async is actually two extra microticks faster than promises now, if you needed a reason besides the more synchronous-style syntax async / await provides to developers unfamiliar with promises
  • Faster JavaScript parsing – at startup of a web page, just under 10% of the V8 time is spent parsing JS. The latest JavaScript parser released has improved parsing speed by up to 30% on desktops

More secure security with TLS 1.3

TLS, which stands for transport layer security, is how Node handles encrypted stream communication.

With the release of Node.js 12, TLS gets an upgrade to version 1.3, which sounds insignificant, but is actually a major update, with numerous performance and security enhancements. Although it sounds counterintuitive at first, TLS 1.3 is actually a simpler protocol to implement than TLS 1.2, making it more secure, easier to configure, and quicker to negotiate sessions between applications.

By using TLS 1.3, Node apps will have increased end-user privacy while also improving the performance of requests by reducing the time required for the HTTPS handshake.

Bottom line: better security for everyone using it and less latency between communicating services. That’s a major win to me.

Properly configured default heap limits

Now, let’s talk about some lower level improvements. Up to this point, the JavaScript heap size defaulted to the max heap sizes set by V8 for use with browsers, unless manually configured otherwise. With the release of Node.js 12, the JS heap size will be configured based on available memory, which ensures Node doesn’t try to use more memory than is available and terminate processes when its memory is exhausted.

Say goodbye to out of memory errors – at least some of the time – when processing large amounts of data. The old --max-old-space-size flag will still be available to set a different limit if needed, but hopefully, this feature will reduce the need for setting the flag.

The default http parser becomes llhttp

Unbeknownst to many (myself included), the current http_parser library used in Node has been extremely difficult to maintain and improve upon, which is why llhttp was born. The project is a port of http_parser to TypeScript, which is then run through llparse to generate the C or bitcode output.

Turns out, llhttp is faster than http_parser by 156%, it’s written in fewer lines of code, and all performance optimizations are generated automatically, as opposed to http_parser’s hand-optimized code.

In Node.js 12, they’ve decided to switch the default parser to llhttp for the first time, and more thoroughly, put it to the test. Let’s hope it continues to perform well when lots of different applications with lots of different needs are trying it out.

Diagnostic reports on demand

Switching the conversation to debugging, there’s a new experimental feature in Node.js 12 allowing users to generate a report on demand or when certain trigger events occur.

This kind of real-time reporting can help diagnose problems in production including crashes, slow performance, memory leaks, high CPU usage, unexpected errors, etc. – the kind of stuff that usually takes hours if not days to debug, diagnose and fix.

Integrated heap dumps

Another feature in this release around heaps, sure to speed up the debugging process, is integrated heap dumps, which ships with Node.js 12, already built in.

Now there’s no need to install new modules to investigate memory issues – just tell Node what kind of JSON-formatted diagnostic summary you want via the command line or an API call and parse through all of the info you can handle.

Native modules get easier in Node.js

Stepping back from the low-level improvements, there’s some cool stuff also coming for developers and module makers within the Node ecosystem.

Making and building native modules for Node continues to improve, with changes that include better support for native modules in combination with worker threads, as well as the version 4 release of the N-API, which makes it easier to configure your own threads for native asynchronous functions.

Summed up, this means that creators and maintainers of Node-specific modules have almost as easy a time maintaining these modules as pure JavaScript module creators. The increased complexity that resulted from maintainers needing to rebuild the distributed binaries for each Node.js version they wanted their modules to support is now largely abstracted away courtesy of the N-API.

Worker threads are coming – the experimental flag has been removed

Worker threads, while they’ve been around since Node 10, no longer require a flag to be enabled – they’re well on their way to moving out of the experimental phase. Prior to Node.js 11.7.0, you could not access the worker thread module unless you started node with the --experimental-worker flag in the command line.

$ node -e "require('worker_threads'); console.log('success');"
internal/modules/cjs/loader.js:605
    throw err;
    ^
Error: Cannot find module 'worker_threads'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:603:15)
    at Function.Module._load (internal/modules/cjs/loader.js:529:25)
    at Module.require (internal/modules/cjs/loader.js:657:17)
    at require (internal/modules/cjs/helpers.js:22:18)
    at [eval]:1:1
    at Script.runInThisContext (vm.js:123:20)
    at Object.runInThisContext (vm.js:312:38)
    at Object. ([eval]-wrapper:6:22)
    at Module._compile (internal/modules/cjs/loader.js:721:30)
    at evalScript (internal/bootstrap/node.js:720:27)
$
$ node --experimental-worker -e "require('worker_threads'); console.log('success');"
success
$

Workers really shine when performing CPU-intensive JavaScript operations, they won’t help much with I/O-intensive work. Node’s built-in asynchronous I/O operations are more efficient than Workers can be.

Startup time improvements

Node.js 11 reduced startup time of worker threads almost 60% by using built-in code cache support.

Node 12 has built upon this idea to generate the code cache for built-in libraries in advance at build time, allowing the main thread to use the code cache to start up the initial load of any built-in library written in JavaScript.

The end result is another 30% speedup in startup time for the main thread, and your apps will load for users faster than ever before.

ES6 module support, it’s almost here

I saved the best for last. One of the most exciting features to me is ES6 module support – the thing so many of us have been waiting for. This feature is still experimental, and the Node team is looking for feedback from people trying it out, but just imagine being able to transition seamlessly from front-end to back-end JavaScript with nary a care in the world.

Here’s the best of what the latest version of -–experimental-modules contains:

  • Zero-cost async stack traces – this will serve to enrich the error.stackproperty with asynchronous call frames without adding extra runtime to the V8 engine
  • Faster calls with arguments mismatch – in the past, V8 had to handle all function calls with too many or too few parameters the same way, which came at a performance cost. Now, it’s smart enough to know when it can skip this step, reducing call overhead up to 60%
  • Faster async functions and promises – yes indeed, using async is actually two extra microticks faster than promises now, if you needed a reason besides the more synchronous-style syntax async / await provides to developers unfamiliar with promises
  • Faster JavaScript parsing – at startup of a web page, just under 10% of the V8 time is spent parsing JS. The latest JavaScript parser released has improved parsing speed by up to 30% on desktops
// relative urls
‘./examples.js’
 
// absolute URLs
‘file:///opt.app/examples.js’
 
// package names
‘example-package’
 
// paths within packages
example-package/lib/examples.js

  • Zero-cost async stack traces – this will serve to enrich the error.stackproperty with asynchronous call frames without adding extra runtime to the V8 engine
  • Faster calls with arguments mismatch – in the past, V8 had to handle all function calls with too many or too few parameters the same way, which came at a performance cost. Now, it’s smart enough to know when it can skip this step, reducing call overhead up to 60%
  • Faster async functions and promises – yes indeed, using async is actually two extra microticks faster than promises now, if you needed a reason besides the more synchronous-style syntax async / await provides to developers unfamiliar with promises
  • Faster JavaScript parsing – at startup of a web page, just under 10% of the V8 time is spent parsing JS. The latest JavaScript parser released has improved parsing speed by up to 30% on desktops
// default imports / exports
import test from ‘./examples’
 
// named imports / exports
import {example1, example2} from ‘./examples’
 
// namespace exports
 import * as samples from ‘./examples’

  • Zero-cost async stack traces – this will serve to enrich the error.stackproperty with asynchronous call frames without adding extra runtime to the V8 engine
  • Faster calls with arguments mismatch – in the past, V8 had to handle all function calls with too many or too few parameters the same way, which came at a performance cost. Now, it’s smart enough to know when it can skip this step, reducing call overhead up to 60%
  • Faster async functions and promises – yes indeed, using async is actually two extra microticks faster than promises now, if you needed a reason besides the more synchronous-style syntax async / await provides to developers unfamiliar with promises
  • Faster JavaScript parsing – at startup of a web page, just under 10% of the V8 time is spent parsing JS. The latest JavaScript parser released has improved parsing speed by up to 30% on desktops

Hallelujah! I’m really stoked for when this comes out from behind the flag for full adoption.

New compiler & platform minimum standards for Node 12

And last but not least, there are new requirements for running Node itself.

With newer features coming to Node.js via internal improvements and upgrades to the C++ of the V8 engine, comes new minimum requirements for Node.js 12. The codebase now needs a minimum of GCC 6 and glibc 2.17 on platforms other than macOS and Windows. Binaries released use this new toolchain minimum and include new compile-time performance and security enhancements.

If you’re using Mac or Windows machines, you should be fine: Windows minimums are the same for running Node.js 11, Mac users will need at least Xcode 8 and a minimum macOS of 10.10 “Yosemite”. Linux compatible binaries from nodejs.org will support Enterprise Linux 7, Debian 8 and Ubuntu 14.04, but custom toolchains on systems not natively supporting GCC 6 may be necessary. I’m sure you’ll figure out what’s needed quickly enough.

Conclusion

Yes, Node.js is only 10 years old, yes, it’s single threaded, and yes, it is not as widely adopted and leveraged as some other programming languages, but Node boasts something no other programming language can claim: it is built with JavaScript, and can run both on the client and server side.

And the teams and companies working to support and improve Node are some of the best and brightest in the business. Node has continued to learn from core JavaScript and other languages, cherry-picking the right pieces to incorporate into itself, becoming a better and better platform for developers and applications, alike.

Node.js 12 brings about some extremely exciting improvements like ES6 module support, better application security, and quicker startup times. Although it will not go into LTS (long term support) mode until October 2019 I’m pumped to dig into these new features and see what else the team can dream up to continue making this platform a great server-side solution.

=============================

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Node.js 12 - The future of Server-side JavaScript

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

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

If you look at the backend technology used by today’s most popular apps there is one thing you would find common among them and that is the use of NodeJS Framework. Yes, the NodeJS framework is that effective and successful.

If you wish to have a strong backend for efficient app performance then have NodeJS at the backend.

WebClues Infotech offers different levels of experienced and expert professionals for your app development needs. So hire a dedicated NodeJS developer from WebClues Infotech with your experience requirement and expertise.

So what are you waiting for? Get your app developed with strong performance parameters from WebClues Infotech

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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!

Original Source

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Node JS Development Company| Node JS Web Developers-SISGAIN

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Node JS Development Advantages - How Your App Will Benefit From This JavaScript Framework

Web development has been controlling the JavaScript system features for many years. Many big online sites use Java Script for their everyday operations. And recently there has been a change and a shift towards cross-platform mobile application development. The main software frameworks in work these days are React native, apache Cordova, native script and hybrid tools. In the last ten years, Node.JS has been used as a backend development framework. Developers nowadays want to learn and use the same technologies for one entire website. They do not want to learn an entire language for server development. And Node.JS is able to adapt all the functions and syntaxes to the backend services from JavaScript. If you do not know the languages or syntaxes for Node JS development, you can look for an online guide. These guides have a detailed overview of the additional functions and basic systems. You will also find simple tasks in these guides. To read more click on the link.

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