What is a Session? The Session is a container to store data that you want access to across requests. Each user that visits your website has a unique session.  You can use sessions to store and access user data as they browse your application. Sessions are an integral part of web application development because they allow the application to store state. Based on what action a user took on Page A, we can show a different Page B. Without them, applications would be stateless, and not very useful. Why Session important? Each and Every web application that maintains user data...

In the previous tutorial, we define routes, but those routes are static and fixed. In this post, we are going to learn about URL parameters and routing in Express.js. To use the dynamic routes, we should provide different types of routes. Using dynamic routes allows us to pass parameters and process based on them. The URL module splits up a web address into readable parts. Topics Covered : What is URL building? What are dynamic routes? What is pattern matched routes? NOTE: To run the below mentioned code you must need to install express module. Here is an example of...

ExpressJS RESTful API is an application program interface (API) that uses HTTP requests to GET, PUT, POST and DELETE data. Topics Covered What is ExpressJS Restful API? Why we need ExpressJS Restful APIs. Advantages Initialize npm and install the  modules Creates  a  New User Returns All the Users From the Database Gets a Single User From the Database Deletes a  User From the Database Updates a Single User in  the Database Why we need ExpressJS Restful APIs The World Wide Web itself is based on HTTP and is based on RESTful API architecture. Mostly all the modern web browsers are RESTful API client....

It is important to create RESTful API while working with ExpressJS. If you will create API you will have to go through a number of operations for the client request to be done. For any particular task, we use so many files like HTML, CSS, JAVASCRIPT, IMAGES and so on. To manage these files in directories and to create a proper structure we use Scaffolding. Scaffolding allows us to create a skeleton for a web application when we work with ExpressJS. We manually create our public directory, add middleware, create separate route files, etc. A scaffolding tool sets up all...

Cookies are simple files that are stored on user’s computer.It stores the data in a text file. This helps us to keep track of the user action. Cookies can be accessed either by the web server or client computer. This allows the server to deliver a page to a particular user, or the page itself can be stored some script which is aware of the data in the cookie and so is able to carry information from one visit to the website or related site to the next. The following are the various uses of the HTTP Cookies:- Session management...

File upload is a common feature that almost every website needs. To perform uploading operation in ExpressJS we have middleware known as Multer. So in this tutorial, we will go step by step on how to handle single and multiple files uploads with ExpressJS. Topics Cover: Getting Familiar with Multer. Setting Our ExpressJS application. Uploading Files using 'Multer' Getting Familiar with Multer. Multer : Multer is a node.js middleware for handling multipart/form-data and can be used in ExpressJS for uploading files. Now the first step that we have to follow is installing the 'npm' for multer in your project. $...

Forms are widely used in the web to submit or fetch some information for the visitors. Multipart/form-data is a type of encoding. It is important to note that it works only with POST method. This is also important while using uploading files. Without this, you can’t upload files using form. The uploaded files will not be encoded. Firstly go to terminal/cmd and use the below code to install the body-parser(for parsing JSON and URL-encoded data) and multer(for parsing multipart/form-data) middleware. npm install --save body-parser multer Express.js is the most popular web development Node js framework. There are two major aspects to...

Insert One – Insert Single Document in Collection. syntax:- db.collection(<collection_name>).insertOne(<document>, <callback_function>) Insert Many – Insert Multiple Document in Collection. syntax:- db.collection(<collection_name>).insertMany(<documents_array>, <callback_function>) Insert One -Insert Single Document in Collection We have a database with the name of 'mydb' and we are going to insert a document in customers collection. Insert single Document directly //to import mongodb var MongoClient = require('mongodb').MongoClient; //connect url var url = "mongodb://localhost:27017/mydb"; //make client connect MongoClient.connect(url, function (err, client) { var db = client.db('mydb'); if (err) throw err; // insert document to 'customers' collection using insertOne db.collection("customers").insertOne({ name: "ESI", address: "Highway 37" }, function (err, result)...

If we want to read document from MongoDB collection using Node.js so we use find method. There are two methods one is FindOne() other is find(). Find One – Find Single Document from Collection We have lot of documents in a collection, we will match the documents and find the single document out of the multiple documents that we match using findOne(). The findOne() method returns the first occurrence from the collection according to the 'query' object. if you will give nothing inside findOne like this will return the first document from the collection. //to import mongodb var MongoClient =...

In Mongobooster  we can create our own Database, Collections(tables), Document(Tuple/Row) directly or we can create them using Node.js. //to import mongodb var MongoClient = require('mongodb').MongoClient; //mydb is the new database we want to create var url = "mongodb://localhost:27017/mydb"; //make client connect MongoClient.connect(url, function (err, client) { var db = client.db('mydb'); if (err) throw err; //customers is a collection we want to create db.createCollection("customers", function (err, result) { if (err) throw err; console.log("database and Collection created!"); client.close(); }); }); Write this code in your editor and save with js extension and run this at your terminal. (I have saved above code...