Make a RESTFul API in nodejs using ExpressJS

Make a RESTFul API in nodejs using ExpressJS

Hello viewers, whats up!! Here i am back again with the new series of  Nodejs. Node.js is an open-source, cross-platform JavaScript runtime environment that allows developers to run JavaScript code outside of a web browser. It is built on the V8 JavaScript runtime engine, which is the same engine that powers the Google Chrome browser. 

Node.js is commonly used for building APIs (Application Programming Interfaces). You can create RESTful APIs or GraphQL APIs using Node.js to handle HTTP requests and serve data to client applications.

Key features of Node.js include:

# Asynchronous - Node.js is designed to be asynchronous, meaning it can handle a large number of concurrent connections without the need for multithreading.

# Single-threaded, Non-blocking I/O - Node.js uses a single-threaded event loop to manage asynchronous operations.

# npm (Node Package Manager): npm is the default package manager for Node.js, allowing developers to easily manage and install libraries and dependencies for their projects.

# Server-Side Development: Node.js is commonly used for server-side development, where it excels at handling real-time, data-intensive applications, such as chat applications, online gaming, and streaming services.

 

But Why we are using Expressjs Here, just because of incase if you want to make API using nodejs directly then its a very complex method to create API and integrate directly thats why we are using Expressjs framework and in this framework with the help, you can create RESTful API easily.

Install ExpressJS

npm i or npm install express - with this help you can install ExpressJS framework.

RESTFUL API

Importing the express module:

const express = require('express');

This line imports the Express framework into your script. express is a web application framework for Node.js that simplifies the process of creating web servers and handling HTTP requests and responses.

Creating an Express application instance:



const app = express();

This line creates an instance of the Express application. This app object is the core of your web server and is used to define routes, middleware, and other settings.


Setting the port number:

const port = 5000;

Here, the variable port is set to 3000. This is the port on which your server will listen for incoming requests. You can change this port number to any other valid port number.

Defining a simple route:


app.get('/api/hello', (req, res) => {
  res.json({ message: 'Hello, API!' });
});

This code defines a route for handling HTTP GET requests to the path /api/hello. When a request is made to this endpoint, the server responds with a JSON object containing a message property: {"message": "Hello, API!"}. The res.json() method sends a JSON response to the client.

Starting the server:


app.listen(port, () => {
  console.log(`Server is running on port ${port}`);
});


The app.listen() method starts the server and makes it listen for incoming requests on the specified port (3000 in this case).
The callback function is executed once the server has started, and it logs a message to the console indicating that the server is running.

To run this code, you would save it in a file (e.g., index.js or restful-api.js ) and execute it using the node command in the terminal:

After running the script, you can open a web browser or use a tool like Postman to make a GET request to http://localhost:5000/api/hello and see the JSON response.

Whole Code

const express = require('express')
const app = express();
const port = 5000;

app.get('/api/hello', (req, res) => {
  res.json({ message: 'Hello, API!, I am atul from kumaratuljaiswal.in' });
});



app.listen(port, () => {
  console.log(`Server is running on port ${port}`);
});

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