Node.js

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Node.js® is a JavaScript runtime built on Chrome's V8 JavaScript engine. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. Node.js' package ecosystem, npm, is the largest ecosystem of open source libraries in the world.

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I successfully got this example to work on my Windows 10 pc. (thanks to help from Expert it_saige)
https://www.experts-exchange.com/questions/29039118/Running-a-Hello-World-on-Node-js-on-Windows-10-newbie.html?anchor=a42185760¬ificationFollowed=191140277#a42185760

I now want to host it on a GoDaddy hosting account I just signed up for.

I've never setup a Node.js website before - though I have worked with IIS/ASP sites for years.
Is it just a matter of copying the files to a particular folder (eg. root)?

Thanks for any help.
0
The Eight Noble Truths of Backup and Recovery
LVL 4
The Eight Noble Truths of Backup and Recovery

How can IT departments tackle the challenges of a Big Data world? This white paper provides a roadmap to success and helps companies ensure that all their data is safe and secure, no matter if it resides on-premise with physical or virtual machines or in the cloud.

I am looking into Webpack 2 Code Splitting for a project but I'm not sure if I understand how code splitting works.

In my project I have 2 features.

Each feature consists of 4 or 5 files so the code for each feature has several javascript files where the code lives.

These javascript files are NOT ES6 Modules, just standard javascript files with code.

With Webpack 2 Code Splitting I intend to break all these files into 2 groups so that can load them on demand when needed.

So, what I'm thinking of doing with it is ...

1. Project Loads just the core

2. On demand the features will load when needed.

Would code splitting work in this circumstance and is this what it's for?
0
As a junior, I'm a bit new to front end programming (crammed learning JS/other languages/NPM/NodeJS/etc within three months for my current role) so apologies if what I say doesn't make sense.

I've helped to build a UI for an application with the use of NPM/Node JS. The application stores data on a UNIX server. The UI accesses the data on the server (https://myhostname:8090/blah/blah) and presents the results with a nice UI. With the help of GIT, I've managed to do move all the src UI code onto the UNIX server. The purpose is for automation

While a specific file (in my UI code) specifies the UNIX server configuration, I've used NPM to build a bundle.js (Which bundles all the JS files into a single file) file. I move this bundles.js along with the index.html and CSS styling files to an appropriate directory in order to use Maven to build a JAR file. And with a start/stop server script to run the process to run  the code, I can just enter the UNIX hostname/port number in my browser window in order to access the UI and data. This all works.

However. I now need to generalise the server configuration in my bundle.js file as well as properties file on server side such that I'm not hard coding server configuration anywhere (meaning I can deploy the UI on any server with no issue). i.e. playing with "localhost" instead of the actual server hostname etc.

I want to try my best, but I need to acknowledge that I have no real server configuration experience and hence need a …
0
Hi,
I'm trying to setup a new webrtc instance behind the firewall where tcp 80 and 443 ports are only available.
All is fine as long as udp ports are enabled. Once I block udp, I can't establish a client connection.
The stun/turn server has been setup however connections are not redirected from webrtc.

RTCMultiConnection.js config:

var IceServersHandler = (function() {
        function getIceServers(connection) {
            var iceServers = [];
iceServers.push(getTURNObj('turn:my.domain.com:443?transport=tcp', 'user', 'pass'));
            if (window.RMCExternalIceServers) {
                iceServers = iceServers.concat(getExtenralIceFormatted());
            } else if (typeof window.getExternalIceServers !== 'undefined' && window.getExternalIceServers == true) {
                connection.iceServers = iceServers;
                window.iceServersLoadCallback = function() {
                    connection.iceServers = connection.iceServers.concat(getExtenralIceFormatted());
                };
            }

            return iceServers;
        }

        return {
            getIceServers: getIceServers
        };
    })();

turnserver.conf config

listening-port=80
tls-listening-port=443
listening-ip=10.10.10.10
relay-ip=1.1.1.1
external-ip=1.1.1.1/10.10.10.10
lt-cred-mech
user=user:pass
realm=domain.com
no-udp
no-dtls
no-udp-relay
cert=/usr/local/etc/cert.pem
pkey=/usr/local/etc/pkey.pem

All is running in AWS cloud.

0
Hi

In Facebook, 1000's of people can like or frown or comment on certain columns.

In the Facebook API, am I able to easily message those people interested in the topic? are there ways, Apps to do this? Any costs?

This message page suggests billions? Really . . . .? . . .  here

Do I need to use Java or PHP coding in any way?

Thanks
0
I am learning Angular, Node, npm, deployd, mongodb, etc.  I am making my way through a book titled "Pro AngularJS" by Adam Freeman.

on page 120 I am attempting to prepare the data for a "real world" application called "sportsstore".

I was instructed to install a module called "deployd" which apparently is used for modelling  API's for web applications.

I did that and when I try to start start the "deployd" service I get an error:

C:\PROGRA~2\deployd>dpd -p 5500 sportsstore\app.dpd --mongod
starting deployd v0.8.9...
internal/child_process.js:289
  var err = this._handle.spawn(options);
                         ^

TypeError: Bad argument
    at TypeError (native)
    at ChildProcess.spawn (internal/child_process.js:289:26)
    at exports.spawn (child_process.js:380:9)
    at Object.exports.restart (C:\Users\knowlton\AppData\Roaming\npm\node_modules\deployd\lib\util\mongod.js:38:14)
    at Command.start (C:\Users\knowlton\AppData\Roaming\npm\node_modules\deployd\bin\dpd:149:16)
    at Command.listener (C:\Users\knowlton\AppData\Roaming\npm\node_modules\deployd\node_modules\commander\index.js:301:8)
    at emitOne (events.js:96:13)
    at Command.emit (events.js:188:7)
    at Command.parseArgs (C:\Users\knowlton\AppData\Roaming\npm\node_modules\deployd\node_modules\commander\index.js:617:12)
    at Command.parse (C:\Users\knowlton\AppData\Roaming\npm\node_modules\deployd\node_modules\commander\index.js:458:21)
    at Object.<anonymous> 

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0
Hello Exchange Experts,

I have 1 DAG with 4 nodes with Exchange 2013, I would like to know if I could create 1 BD for my heath mailbox, I have read that is not a best practice to move them, but for my administration could be better. So my questions:
*  The health mailbox has to be local in each node? or I could have them all in one server
* Could I move the health mailbox to another DB, and another disk unit, in the same node?

Thanks a lot!
0
I have to write a Node.JS application that connects to a remote server.  The remote server has a login manager that authenticates my session then spawns a separate process to handle the rest of my session.  The way that works is that I have to make a non-SSL network connection to the login manager and do an initial unprotected handshake.  The lets the client and server negotiate if they will be doing SSL or plain text communications.  If SSL then I need to elevate my socket to an SSL socket, send my login and password along with some other initial information, then get a success of failure message back from the login manager.  If success then I know the login manager is starting a new process and handing off my open socket connection to that new process.  Since the server can't pass the SSL context it de-elevates the SSL connection and runs a program passing it the non-SSL open socket.  Then the new program creates it's own SSL context on the open socket. So in my Node.JS code I need to close the SSL socket but leave the raw socket open.  The new program will send me a success message when it is up and running at which time I need to re-elevate my open socket to SSL again.

My question is how can I close an SSL socket leaving the raw socket open so I can continue to use the raw socket and then re-elevate it to SSL again?
0
I have a node.js module that needs unit test. Here is the key relevant code:

old code:
                const memsqlPool = {
                    execute: sandbox.stub().resolves(!mockPara || mockPara.memSqlResult || ''),
                };
                sandbox.stub(my-lib.memsql, 'Pool', constant(memsqlPool));

In the source code:

const {memsql} = require('my-lib');
const memsqlPool = new memsql.Pool(my-config);
        function getInfo(id){
            return memsqlPool.execute(my-arguments).then(my-mapping-object);
        }

This code actually hints that memsqlPool.execute() can only be called once in any given test case, because it always returns the same results.
Now I have to make two memsql calls, one depends on another.  I try to make it something like:

memsqlPool.execute.onFirstCall().returns('some-value');
memsqlPool.execute.onSecondCall().return('some-other-value');

But just do not know how to fit this idea into the unit test code above.

Anyone can help?
0
I need a identity server for Node.js that works with relational databases
0
Does Powershell have you tied up in knots?
LVL 6
Does Powershell have you tied up in knots?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

I am a relative newbie to node.js and typescript and am looking for tutorials and examples for building custom libraries for typescript. I am currently working on a project(switched to webstorm GUI) that requires I build several microservices and several of the microservices will need to share certain code, i.e., base repository functionality, etc. My though would be to move the code they have in common to a series of separate libraries(projects) and make them into typings and have the projects that need them to install them. Following the example I found here, and using grunt: What is the story for creating and consuming TypeScript libraries?, I was able to generate the .js file and the .d.ts files in a dist folder on the project. There are a few areas that I am confused about:

1) The example makes reference to a "main": "./dist/my.service.js" section in the jsconfig file, how necessary is this file and what should go into it?

2) If all of the files are transpiled and added to the dist folder, will the dependent code still be able to access it or do I have to transpile all of the files to root?

3) After I have have all of the file successfully transpiled and moved to the proper location, how do I install them to the dependent project if they are local and not up on the npm or Definitely Typed, etc.?
0
After upgrading to node.js 7.5.0, I encountered this error too:  Loading "grunt-karma.js" tasks...ERROR >> TypeError: Cannot read property 'prototype' of undefined
0
npm version
$ npm -v
1.2.14

node version
$ node -v
v0.10.0


$ npm install -g xsl-transform
npm http GET https://registry.npmjs.org/xsl-transform
npm http 304 https://registry.npmjs.org/xsl-transform
npm http GET https://registry.npmjs.org/node_xslt
npm http GET https://registry.npmjs.org/mkdirp/0.3.5
npm http 304 https://registry.npmjs.org/node_xslt
npm http 304 https://registry.npmjs.org/mkdirp/0.3.5

> node_xslt@0.1.9 preinstall C:\Users\TEMP.Rumba-DEV.010\AppData\Roaming\npm\node_modules\xsl-transform\node_modules\node_xslt
> node-gyp rebuild


C:\Users\TEMP.Rumba-DEV.010\AppData\Roaming\npm\node_modules\xsl-transform\node_modules\node_xslt>node "C:\Program Files\nodejs\node_modules\npm\bin\node-gyp-bin\\..\..\node_modules\node-gyp\bin\node-gyp.js" rebuild
gypnpm ERR! node_xslt@0.1.9 preinstall: `node-gyp rebuild`
npm ERR! `cmd "/c" "node-gyp rebuild"` failed with 1
npm ERR!
npm ERR! Failed at the node_xslt@0.1.9 preinstall script.
npm ERR! This is most likely a problem with the node_xslt package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     node-gyp rebuild
npm ERR! You can get their info via:
npm ERR!     npm owner ls node_xslt
npm ERR! There is likely additional logging output above.

npm ERR! System Windows_NT 6.2.9200
npm ERR! command "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "install" "-g" "xsl-transform"
npm ERR! …
0
I am trying to generate a pdf file from a dynamic handlebar webpage that would display data from the database. Once I get this to work on my local machine, I would like to move the code up to elastic beanstalk. The code seems to run that initially makes the call to spawn, however, call to phantomjs does not seem to kick off the script passed to it. Just to confirm, I added a console.log statement at the very beginning of the file and never the print out. Not to mention the other print statement in the script file. The code is below:

code that performs the spawn:
var childArgs = [
                  //'--debug=true',
                  path.join(__dirname, '../phantom/capture.js'),
                  id,
                  filename
                ];

            let child = spawn(phantomjs.path, childArgs, {detached: false});

            console.log('set up stderr.....');
            child.stderr.on('data', (data) => {
              console.log('ps stderr: ${data}');
            });

            console.log('set up stdout.....');
            child.stdout.on('data', (data) => {
              console.log('ps stdout: ${data}');
            });

            console.log('set up close.....');
            child.on('close', (code) => {
                console.log('this is a test 2.....');
                console.log(code);
                if (code !== 0){
                    let error = new Error('An error occurred while creating the current report.');
                    

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0
upload.js file

module.exports.xml_node = "Abc";       

 $('.upload-btn').on('click', function (){
            $('#upload-input').click();
            $('.progress-bar').text('0%');
            $('.progress-bar').width('0%');      
       });

      $('.creatingXMLRequest').on('click', function (){
            console.log("hi");
            $.fn.creatingXMLRequest();
      });

and accessing xml_node variable in app.js file

var upload_file = require('./public/javascripts/upload');        //console.log(upload_file.xml_node);
console.log(upload_file.xml_node);

 After writing  .........module.exports.xml_node = "Abc";  ............... in upload.js file

getting this error..................................................................


$ node app.js
javascripts\upload.js:8
         $('.upload-btn').on('click', function (){
         ^
ReferenceError: $ is not defined
    at Object.<anonymous> (C:\Users\Desktop\file upload using node\public\javascripts\upload.js:8:3)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)
    at Object.<anonymous> (C:\Users\Desktop\file upload using node\app.js:7:19)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)


how to resolve it???
0
app.js

var http = require('http');
var util = require('util');
var fs = require('fs');
http.createServer(function (req, res) {
    console.log('Request received: ');
    //util.log(util.inspect(req)) // this line helps you inspect the request so you can see whether the data is in the url (GET) or the req body (POST)
    //util.log('Request recieved: \nmethod: ' + req.method + '\nurl: ' + req.url) // this line logs just the method and url

    res.writeHead(200, { 'Content-Type': 'text/plain' });
    req.on('data', function (chunk) {
        console.log('GOT DATA!');
    });
      
    res.end("hiiiiiiiiiii");
      util.log(req.params.name);

}).listen(8080);
console.log('Server running on port 8080');


demo.html

<html>
<head>
    <script language="javascript" type="text/javascript" src="jquery-1.8.3.min.js"></script>
</head>

<body>
    response here: <p id="lblResponse">fill me in</p>

<script type="text/javascript">
$(document).ready(function() {
    $.ajax({
        url: 'http://192.168.0.143:8080',
        dataType: "json",
        data: {name:'abc',name1:'pqr'},
        type: 'POST',
            contentType: "application/json",
        jsonpCallback: 'callback', // this is not relevant to the POST anymore
        success: function (data) {
            var ret = jQuery.parseJSON(data);
            $('#lblResponse').html(ret);
            console.log('Success: ')
        },
        error: function (xhr, status, error) {
            …
0
I am reviewing several approaches to re-developing a node.js restful monolithic application using microservices combined with an api gateway. In looking at using the aws api gateway though there seems to be a few items I have not been able to find alot of documentation on. For one, the application I am designing has to be able to support SSO, I would like users to be able to register by either creating a local login or using their current facebook, twitter, etc. social accounts.

How would this process be handled by aws api gateway, especially since I would need to use a custom database to write to and read from, not to mention to authorizing the user?

Additionally, for example, say my microservices has the following bounded contexts:

account(login, registration, profile management),

billing(may not be ideal for serverless due to running time, may opt for docker + ec2),

friend(setting up friend associations),

file(users can upload pictures and videos to their timeline - seems to be another docker + ec2 candidate);

and I want to use an api gateway to secure all of the microservice endpoints except the ones specific to login and registration, how should this be done?

Node.js contains a package that seems to handle jwt and authentication users via facebook, twitter, local, etc. called passport, can I use this with the api gateway authentication?

Also, if the api gateway is securing the microservices, how does the request object and response object get …
0
I created an application on my local machine(mac os x) that generates a report and saves it to a folder in my web project folder. When I deploy the app., this folder should get published as well. Granted, no one should have access to this folder but the app. When I run the code to generate the report works fine on my local machine, but it seems to hang on elastic beanstalk. What do I need to do to make this work on the elastic beanstalk environment?

In a nutshell, I am using phantomjs to convert a dynamic webpage into a pdf file that gets emailed to the appropriate parties involved. Here is the code that generates the file:

page.viewportSize = { width: 2000, height: 800 };
//page.paperSize = { format: 'Letter', orientation: 'landscape', margin: '1cm' };
page.paperSize = { width: '1280px', height: '800px', margin: '0px' };
page.settings.localToRemoteUrlAccessEnabled = true;
page.settings.loadImages = true;
page.settings.javascriptEnabled = true;


page.open("http://example.com/report/" + args[1], function start(status) {
  if (status === 'fail'){
      phantom.exit(1);
      return;
  }

//page.render('/dev/stdout', { format: 'pdf' });
  page.render(fs.workingDirectory + '/tmp/' + args[3], { format: 'pdf' });
  phantom.exit();
  return;
});

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0
add.js

var fs = require('fs');
var addData = " <book category='children'><title>Harry Potter</title><author>J K. Rowling</author><year>2005</year><price>29.99</price></book>";
var cursor = "//cursor";
addData += cursor;
//var ws = fs.createWriteStream('./new_xml.xml');           //creating new file in same folder.      
fs.exists("new_xml.xml", function (exists) {
    if (exists) {
        //Adding new node in existing xml file      
        fs.readFile("new_xml.xml", "utf-8", function (err, data) {
            if (err) {
                console.log(err);
                return;
            }
            var newData = data.replace(/\/\/cursor/, addData);
            fs.writeFile("new_xml.xml", newData, function (err) {
                if (err) {
                    console.log(err);
                    return;
                }
                console.log("XML node is added successfully........");
            });
            // console.log(data);      
        });
    } else {
        console.log("File not exists.................");
    }
});


new_xml.xml

<bookstore>
   <book category="cooking">
       <title lang="en">Everyday Italian</title>
       <author>Giada De Laurentiis</author>
       <year>2005</year>
       <price>30.00</price> </book>
   //cursor
</bookstore>



In this example before //cursor 1 book node is added after executing add.js.......in node js.....(using this command node add.js).

.
.
BUT
same code executed in …
0
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LVL 4
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I am new to aws and have to deploy a node.js app to their elastic beanstalk technology.  I reviewed their docs. and it look like I need to upload a zip(bundle) file to install the node.js app.  I am currently using eclipse neon for development and looking for a way, whether via script or ide, to automate the process of building the bundle file on the fly.  Ideally, eclipse would do this automatically for me whenever I would like to deploy.  I am looking for information and advice what I should use to automate the bundling and publishing processes.
0
I am trying to convert an html file to a pdf document that will ultimately be emailed to several parties.  I am using phantomjs to render the dynamic html document to '/dev/stdout' to ultimately get attached to an email that will be sent out to multiple individuals.  The code involved in this scenario is outlined below:

//This is the capture.js file
var webPage = require('webpage');
var system = require('system');
var args = system.args;
var page = webPage.create();

if (args.length === 1) {
  phantom.exit(0);
} else {
	page.viewportSize = { width: 600, height: 600 };
	page.paperSize = { format: 'Letter', orientation: 'portrait', margin: '1cm' };
	page.open("http://localhost:3000/salesorder/" + args[1], function start(status) {
	  if (status === 'fail'){
		  phantom.exit(1);
		  return;
	  }
		
	  page.render('/dev/stdout', { format: 'pdf' });
	  phantom.exit();
	  return;
	});
}

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//here is the code that reads '/dev/stdout, to retrieve the generated pdf'
function(resolve, reject) {
            	var childArgs = [
            		  path.join(__dirname, '../phantomservice/capture.js'),
            		  id
            		];

          		childProcess.execFile(phantomjs.path, childArgs, {maxBuffer: 1000*1024}, function(err, stdout, stderr) {
          			if (err){
          				reject(err);
          			}
          			
          			resolve(stdout);
          		});
            }

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var mailOptions = {
		    from: fromaddress, // sender address
		    to: toaddresslist, // list of receivers
		    subject: subject, // Subject line
		    html: text
		};
		
		if (attachments){
			mailOptions.attachments = [
		        {   // binary buffer as an attachment
		            filename: 'invoice.pdf',
		            content: new Buffer(attachments),
		            contentType: 'application/pdf',
		            encoding: 'base64'
		        }
		    ];
		}

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Here are the issues I am having:

1) When I send the file to stdout, I am getting a three page blank document, what could be causing this to happen and how can I fix it?
2) As an experiment, I wrote the file to a pdf file and reviewed the file.  In this case I got back the document, but I did not see the page populated with data from the database; the population occurs using jquery.
3) I am using bootstrap, and in the case where I am printing to a file; the formatting is way out of whack, it is treating the document as if it belongs on a tablet or phone because it appears to stack the document items as opposed to making them appear as they are on the webpage.  Wht can be done to fix this?  

This is a node.js app using bootstrap and currently running on my local mac os x laptop.  Any help would be greatly appreciated.
0
I am taking a webpage, using jquery to load the page on document.ready, css to format the page, node.js http to retrieve the page from the server, html-pdf to convert the html to a pdf file. From this point, I am sending the file as an email attachment. The ultimate goal is to create an invoice. The issue is that the css and js do not appear to be processing when it is in external files. I would prefer to keep in external files but need jquery to populate the page on document.ready and the css to properly format the page. Also, I added cheerio to the mix to see if that would make sure the processing occurred correctly and it did not help. The code is outlined below:

email sending code:
    var transporter = nodemailer.createTransport({
        service: 'gmail',
        host: this.hostname,
        auth: {
            user: this.smtpusername,
            pass: this.smtppassword
        }
    });

    var mailOptions = {
        from: fromaddress, // sender address
        to: toaddresslist, // list of receivers
        subject: subject, // Subject line
        html: text
    };

    if (attachments){
        mailOptions.attachments = [
            {   // binary buffer as an attachment
                filename: 'invoice.pdf',
                content: attachments,
                contentType: 'application/pdf',
                encoding: 'base64'
            }
        ];
    }

html conversion code:
                let body = [];
                var options = {
         

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0
Hi,

I am running a web app using node.js that is listening on 8090, so if I go to mywebsite.com:8090, everything works.  I want the user to be able to type in just mywebsite.com and be able to see the website.  This means that I want to forward port 80 to 8090?  Not sure how to accomplish that.  I don't think I need to do reverse proxy, since that would forward 8090 to 80.  I am running ubuntu 14.  Thanks.
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I am new to node.js coming from a c#.net background. When coding in .net, I was use to using several of the design patterns to organize my code, service layer, repository, etc. When I needed to add logic that spanned multiple models, I could use services for this as well. Moving to node.js and reviewing examples and sample code, etc. I do not see alot of utilization of service layer, repositories, etc. What are some of the recommended practices for the following:

1) Code organization and structure, especially for apps rich in business logic?

2) How to handle logic that spans multiple models?

3) What are some good tutorials and sample code sites that demonstrate some good project and code structure with items (1 and (2 in mind?

.net comes with alot of recommended approaches, practices, patterns and coding structure techniques that are actually very good recommendations, which . Sites like www.asp.net, etc. provide pretty good articles, etc. for these recommendations.

I am having trouble finding a consistent approach reviewing node.js examples.
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I am working on a project using nodejs server, gulp, browsersync, wiredep...    Things are (were) generally working but for a reason that I cant quite figure out,  the dependencies seem now to be constantly reloading all of the over and over again ( until the browser crashes ) .   This is happening to a couple of projects.   The projects are based on this git repo https://github.com/johnpapa/pluralsight-gulp..  

I'm not pasting any of my on code because i'm not sure exactly where the issue is.  But i will provide any on request.


server debug outputs similar to below but for ALL dependencies over and over again.
GET /bower_components/jquery/dist/jquery.js?_=1483622781782 200 2.321 ms - 247597
GET /bower_components/js-rich-marker/src/richmarker.js?_=1483622835418 200 1.256 ms - 211371736
........
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Node.js® is a JavaScript runtime built on Chrome's V8 JavaScript engine. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient. Node.js' package ecosystem, npm, is the largest ecosystem of open source libraries in the world.

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