The usage of Restful API to develop web-based application programming interfaces is widespread and popular. An API may be built quickly and simply using Express, a node.js framework for building back-end web applications. This lesson covers every facet of the Express REST API.
Introduction
The REST Application Programming Interface (API) has become the usual means through which web services communicate and receive data.
When a client makes a request, the request is sent to the rest API first, and then it is sent to the database to get or save the data. After that, the request is sent back to the rest API, and then it is sent back to the client. Browsing an application programming interface (API) is very similar to using a website in a web browser; the only difference is that rather than clicking on buttons, we write code to request data from the server. It is quite versatile and able to fulfill a variety of different kinds of requirements.
What is REST API?
The creation of web services often makes use of a common architecture called REST, which stands for “representational state transfer.”
API, which stands for “Application Programming Interface,” is a kind of code that facilitates communication between two separate software applications.
The REST Application Programming Interface (API) is software that enables two different applications to connect with one another via the internet and a variety of different devices.
HTTP Requests Types:
HTTP Requests are nothing more than messages that are sent by the client to the server in order to perform certain actions on the server.
1. GET is a technique that is mostly used to receive data, but the Get command may also be used to request information from the server.
2. PATCH is a command that may be used to modify, modify and replace, or replace the data.
3. The post method allows for the creation of new data as well as the editing of data that currently exists.
4. Delete Utilizing this delete command will result in the data being removed entirely from the server.
API using Express and Its architecture
A request is transmitted by the client in the form of a JSON file, and with the assistance of an HTTP request that gets a patch post and delete, it will go to the server first. After that, the server will send back the response to the client in the form of a message to tell what transpired with your request.
Step 1: Before anything else, launch your editor. Now, open up your command prompt, and type the following: npm init -y.
Using this command will result in the creation of a JSON file.
Step 2: At this time, we will install express in preparation for that write command npm install express
This will install any prerequisites that are required for the package. JSON file
Step 3: At this point, we will create a new file called index.js in which we will write all of our code.
In the first line, write a few lines of the program’s code. We are going to bring in the express packages.
Step 4:
It was this app.
listen is a command that will tell the server to listen on a specified port, which is 4000 in our example since we have previously declared it as a variable.
Step 5: After that, we will add a second parameter as a call back to inform the API that it is working, and now let’s execute this code to verify whether or not our API is functioning properly or whether or not node.js is installed correctly.
In order for this code to be executed, we will need to create a command node.
Step 6: Since our code is functioning correctly, let’s open our search engine and type in localhost:4000. This command will not be executed, but we may go on to the next step.
Step 7: At this point, we need to provide the second parameter here, which can be found at localhost:4000/mera
Conclusion
In this tutorial, we have discussed subjects such as what is rest API and the different forms of HTTP request, and we have also developed a basic Rest API.