Objective:

The goal of this assignment was to gain practical experience in building a web application using Node.js and the Express framework. We aimed to understand the basics of creating a web server, handling requests and responses, setting up routes, and working with middleware in Node.js Express.

Requirements:

Use Node.js and Express framework to create the web application.
Set up a simple server that listens on a specific port.
Create at least three different routes:
- Route 1: Handle GET requests for the main URL ("/") and display a welcome message.
- Route 2: Handle POST requests to "/api/users" and save user information to a JSON file.
- Route 3: Handle GET requests to "/api/users" and retrieve user information from the JSON file.
Use middleware to handle common tasks like logging and error handling.
Implement error handling for incorrect routes and server errors.
Use the appropriate HTTP methods (GET, POST, etc.) for each route based on their intended purpose.
Use the correct status codes (200, 404, etc.) in the HTTP responses.
Use the appropriate JSON structure for request/response data.

Steps Followed:

Created a new Node.js project using npm.
Installed Express framework and other necessary dependencies.
Created a server file named server.js and imported required modules.
Set up a basic Express server that listens on a specified port.
Implemented the three routes as mentioned, ensuring they handle the correct HTTP methods and provide the expected responses.
Used middleware to handle logging and error handling, utilizing existing middleware libraries.
Tested the application using tools like Postman or curl to ensure the routes and responses are working correctly.
Documented the steps taken, challenges faced, and lessons learned during the assignment.

To start the application

Run command
- install all dependencies npm i
- install nodemon npm i nodemon
- set up nodemon in package.json file
- start the server with nodemon nodemon server

tools

vs code
postman

API endpoints

METHOD	ENDPOINT	DESCRIPTION	STATUS CODE	REQ.BODY
GET	/api/	This home page show welcome message	200	No data required.
POST	/api/users	This endpoint will allow users to register.	201	body : {"name": "chikkuuu","email": "chikkuuu@gmail.com","password": "1234"}
GET	/api/users	This endpoint will all register users.	201	flight id should be passed in params

User Model

{

    name: String,
    email: String,
    password: String,
    address: {
        street: String,
        city: String,
        state: String,
        country: String,
        zip: String
    }

}

Challenges Faced:

Handling errors for invalid routes and server issues
Managing request and response data in the correct JSON format
Storing the users data in the correct JSON format into the json file
hashing the password so it won't be visible to everyone
implementing the logger file to store logs along with ip addresses,timestamps,method and url endpoint

Lessons Learned :

Setting up a web server using Node.js and Express
Handling different types of HTTP requests and designing appropriate routes
Efficiently managing common tasks with middleware
Importance of proper status codes and JSON structures for API design
Gained practical experience in developing web applications with Node.js and Express.

07-Mayankraj/Wellnesys-Assignment