Welcome to this comprehensive Expressjs tutorial. Express.js (alternatively Expressjs) is a web application software that has a simple API to build websites, web apps and back ends. The lightweight structure makes it popular along with the Node.js feature. This tutorial provides you with complete insight into Express.js along with all the fundamental information.
In this article about Expressjs Tutorial, let us look at:
Now let us explore further into the topic and get informed on the working of Express.js.
This framework provides the user with a minimal interface to develop applications. To build an application, numerous tools are required. Express.js provides you with flexible and upgraded tools. This web application is built over Node.js. It provides a vast range of modules that are on npm and can be directly plugged into Express.
Developed by TJ Holowaychuk, Express.js was released in May 2010. It was initially managed by IBM, but now it is under the Node.js Foundation and many open source contributors.
Continuing this Expressjs tutorial, let us look into some of the most notable features of Express.js.
The features of Express.js are:
Let’s get into the nitty-gritty of this Expressjs tutorial and discuss the installation process:
To install Express.js, you need to install Node.js beforehand.
In order to install Express.js creating a project directory is required. Along with that package.json file must be created to hold the project discrepancies. The below code has to be entered:
To install it globally the following code has to be entered:
npm install -g express
To install it into the file or project folder, the below command can be used:
npm install express –save
Since the installation process is complete, let us look at some of the fundamental concerts of Express.js
It is the process of identifying the specific behavior of an application. It is used to specify how an application should react to a client request to a specific route, path, or URI, as well as a specific HTTP Request process. Each route may have several handler functions that are executed when the user searches for a particular route.
The structure for routing in Express.js is;
The four HHTP methods help in specifying the operation that is requested by the user. The various methods are;
Middlewares are capable of performing code execution of any kind. They provide access to the request and response objects, as well as the next function in the application’s request-response loop. They can call the next middleware that is present in the cycle.
Cookies contain certain data or files that are stored in the user’s computer. This data is collected from the websites the user visits. The components of a cookie are as follows;
To use a cookie, the user must install the cookie parser middle through npm into the node modules folder.
Here REST stands for representational State Transfer. It is used in various web service development making use of HTTP request to GET, PUT, POST and DELETE.
The two major types of Database that are present in the Express.js –
The templating option helps in creating and using Html template with minimal code. Some of the popular templates that work Express.js are;
This brings us to the end of this Expressjs tutorial.
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