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Modules in Node.js

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Node.js modules are set of functions that are used to include in your application.It is very similar to the libraries in javascript. When involving in development, we can either use built in modules or else we can create our own modules. Usually Modules are not designed in the same file that we are developing in. Modules are created and stored in separate files for the easy use. So lets create a separate file to create a module.I have created a file called module.js for further proceedings Now I am going to create a basic module to count the number of elements in an  array in my new file. var value =function(array){   return array.length + ' elements are there'; }; console.log(value(['A','B','C','D'])); Now run the command line and check the output Now we have created our module in an separate file.Now we should make this function available outside the module.js file.For that type the following code in module.js file. modu...
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Introduction to body-parser in Node.js

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What is body-parser? body-parser is the  Node.js body parsing middleware.  Middleware are the functions that have access to the  request object (req) , the  response object (res) , and the next middleware function in the application’s request-response cycle.In Node body-parser   is used to parse the body of requests. This provides the following parsers, JSON body parser Raw body parser Text body parser URL-encoded form body parser body-parser does not handle multipart bodies. For this you will have to use some other like, busboy  and  connect-busboy multiparty  and  connect-multiparty formidable multer Installation You can install body-parser by using the following code in your command line. npm install body-parser And then you have to require it in your app.js file Example: var bodyParser = require('body-parser'); //To parse URL encoded data app.use(bodyParser.urlencoded({ extended: false }...
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How to serve a HTML page in Node.js

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Previous article  showed you how to create a basic server. Now lets look around the way to serve a html page using Node.js. First create a index.html file in your project folder. <html> <head>   <title>Home Page</title> </head> <body>   <h1>My first Template</h1>   <p>Hypertext Markup Language is the standard markup language for creating web pages and web applications. With Cascading Style Sheets and JavaScript, it forms a triad of cornerstone technologies for the World Wide Web</p> </body> </html> Now lets see how to serve this page. Take a look at the code below. var http=require('http'); var fs = require('fs'); var server = http.createServer(function(req,res){   console.log('request made :'+req.url);   res.writeHead(200,{'Content-Type': 'text/html'});   var read=fs.createReadStream(__dirname + '/index.html','utf8');   read...
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