vetmedBackend

Node.js Backend Documentation

Introduction

This Project follows Model-View-Controller (MVC) pattern.

Here's a breakdown of how the folders align with the MVC pattern:

Controller folder: This folder contains the controller files. It handle the logic for processing requests, interacting with models, and preparing the data to be sent back to the client.
Model folder: This folder contain the model files. Models represent the data structures or entities of your application.
Routes folder:: This folder contain the model files. Models represent the data structures or entities of your application. The routes folder contains the route files, which define the endpoints and their associated controllers. Routes handle the incoming requests and direct them to the appropriate controller method based on the URL and HTTP method. They serve as the entry point for requests and establish the mapping between URLs and controller actions.

Installation and Setup

To set up the backend locally, follow these steps:

Clone the repository git clone <repository-url>
Install dependencies Navigate to the project root directory and run the following command to install the required dependencies: npm install This will install all the dependencies listed in the package.json file.
Configure environment variables To configure environment variables when the .env file is located in the config folder, you can follow these steps:

Create the .env file Create a file named .env in the config folder of your project. create a folder named config and inside it create your .env file.
Define environment variables Inside the .env file, define the necessary environment variables. Here's an example:
DB_URI=<your-database-connection-string>
JWT_SECRET=<your-jwt-secret-key><br> PORT = 4000
JWT_EXPIRE = 5d
COOKIE_EXPIRES = 5
COOKIE_EXPIRES = 5
MONGO_URL = <your_db_url>
SMPT_MAIL=vetmedman501@gmail.com
SMPT_PASSWORD =<password>
SMPT_HOST=smpt.gmail.com
FRONTEND_URL = "http://localhost:3000"

Start the backend server To start the backend server in development mode with automatic restart on file changes, run the following command: npm run dev

Directory Structure

 -backend
     /controllers 
         | - /categories
                |- animalController.js
                |- dailyEssentialController.js
                |- medicalTypeController.js
                |- TreatmentTypeController.js
         | - oderController.js
         | - productController.js
         | - userController.js
         | - varietyController.js
     /database-Connection
         | - database.js
     /middleware
         | - auth.js
         | - catchAsyncError.js
         | - error.js
     /models
         | - /categories
                |- animal.js
                |- dailyEssential.js
                |- medicalCareModel.js
                |- treatmentModel.js
         | - oderModel.js
         | - productModel.js
         | - userModel.js
         | - varietyModel.js
     /routes
         | - /categories
                |- animalTypeRoutes.js
                |- dailyEssentialRoutes.js
                |- medicalCareRoutes.js
                |- treatmentTypeRoutes.js
         | - oderRoutes.js
         | - productRoutes.js
         | - userRoutes.js
         | - varietyRoutes.js

     /utils
     .gitignore
      app.js
      server.js
-package.json
-package-lock.json

Models

1. userModel.js

The userModel.js file contains the definition of the User model, representing the user data structure in your application. It provides the schema and methods for working with user data in the database.

Schema Field name, email,password, role, createdAt, resetPasswordToken -Token used for password reset., resetPasswordExpire - Expiration date for the reset password token. Hooks
- pre("save") - This hook is executed before saving the user to the database. It checks if the password field is modified and hashes the password using bcrypt if it is.
Methods
- getJWTToken(): - his method generates and returns a JSON Web Token (JWT) for the user. The JWT includes the user's ID as the payload.
- comparePassword(enteredPassword) - This method compares the entered password with the stored hashed password and returns a boolean indicating if they match.
- getResetPasswordToken - This method generates a random token for password reset, hashes it, and adds it to the resetPasswordToken field. It also sets the expiration date for the token.

2.Product Model

The Product model represents a product in the application. It defines the schema for storing product-related information in the database.

Note:- Go to product Model to see all the entities. Here lrt's discuss some important one

  ratings:{
        type:Number,
        default:0
    },

//This is for whole ratings of a single product.
e.g - if 2 user added rating for a single product then ratings will show the avg of 2 user's rating.

 reviews:[
        {
            user:{
                type:ObjectId,  // ObjectId (reference to "User" collection, required)
                ref:"User",
                required:true
            },
            name:{
                type:String,
                required:true,
            },
            rating:{
                type:Number,
            },
            comment:{
                type:String,
            }

        }
    ],

// This is to include the review of a single user for a single product
// the rating in review is for a single user.

3.OrderModel

Schema Fields

shippingInfo: The shipping information for the order.
- Fields:
  - fname: The first name of the shipping address.
    - Type: String
    - Required field
  - lname: The last name of the shipping address.
    - Type: String
    - Required field
  - address: The address for shipping.
    - Type: String
    - Required field
  - OptionalAddress: Optional additional address information.
    - Type: String
  - farmAddress: Farm address.
    - Type: String
  - city: The city for shipping.
    - Type: String
    - Required field
  - state: The state for shipping.
    - Type: String
    - Required field
  - country: The country for shipping.
    - Type: String
    - Required field
  - pinCode: The PIN code for shipping.
    - Type: Number
    - Required field
  - phoneNo: The phone number for shipping.
    - Type: Number
    - Required field
billingInfo: The billing information for the order. It has the same structure as the shippingInfo field.
orderItems: The items included in the order.
- Type: Array of objects
- Fields:
  - name: The name of the ordered item.
    - Type: String
  - quantity: The quantity of the ordered item.
    - Type: Number
    - Required field
  - image: The image associated with the ordered item.
    - Type: String
    - Required field
  - product: The reference to the "Product" collection representing the ordered product.
    - Type: ObjectId
    - Reference: "Product" collection
    - Required field
  - varieties: Array of strings representing the varieties of the ordered product.
user: The reference to the "User" collection representing the user who placed the order.
- Type: ObjectId
- Reference: "User" collection
- Required field
orderedAt: The timestamp indicating when the order was placed.
- Type: Date
- Required field
orderStatus: The status of the order.
- Type: String
- Required field
- Default: "Processing"
deliveredAt: The timestamp indicating when the order was delivered.
- Type: Date
createdAt: The timestamp indicating when the order was created.
- Type: Date
- Default: Current timestamp when the order is created.

Export

The Order model is exported as a Mongoose model named "Order" for use in other parts of the application.

4.Variety Model

The Variety model represents the variations or options available for a product in the application. It defines the schema for storing variety-related information in the database.

Schema Fields

subProduct: The sub-products or categories of the variety.
- Type: Array of strings
Length: The available length options for the product.
- Type: Array of strings
Coating: The available coating options for the product.
- Type: Array of strings
Sterility: The available sterility options for the product.
- Type: Array of strings
Quality: The available quality options for the product.
- Type: Array of strings
colors: The available colors for the product.
- Type: Array of strings
sizes: The available sizes for the product.
- Type: Array of strings

Export

The Variety model is exported as a Mongoose model named "varieties" for use in other parts of the application.

5.categories/animal.js (Model)

The Animal Type model represents different types or categories of animals in the application. It defines the schema for storing animal type-related information in the database.

Schema Fields

animalName: The name of the animal category.
- Type: String
- Trimming: Removes leading and trailing whitespace
- Required: Must be provided
- Maximum length: 30 characters
imageUrl: The URL of the image associated with the animal category.
- Type: String
user: The user who created or manages the animal category.
- Type: ObjectId
- Reference: "User" model
- Required: Must be provided

Timestamps

The Animal Type schema includes timestamps, which automatically add the following fields to the documents:

createdAt: Indicates when the document was created.
updatedAt: Indicates the last time the document was updated.

Export

The Animal Type model is exported as a Mongoose model named "Animal" for use in other parts of the application.

6.Essential Type Model

The Essential Type model represents different types or categories of essentials in the application. It defines the schema for storing essential type-related information in the database.

7.Medical Type Model

The Medical Type model represents different types or categories of medical care in the application. It defines the schema for storing medical care type-related information in the database.

8.Treatment Type Model

The Treatment Type model represents different types or categories of treatments in the application. It defines the schema for storing treatment type-related information in the database.

Controllers

animalController

createAnimalType: This function creates a new animal category. It checks if the animalName already exists in the database (case-insensitive). If it exists, it returns an error message. Otherwise, it creates a new animal category using the Animal model with the provided animalName, imageUrl, and user (from req.user.id). It responds with a success message and the created animal category.
allAnimalType: This function retrieves all animal categories from the database using the Animal model. It responds with a success message and an array of animal categories.
updateAnimalType : This function updates an existing animal category. It finds the animal category by its ID (type_id parameter) and updates it with the data from req.body. The { new: true } option ensures that the updated animal category is returned as the response. It responds with a success message and the updated animal category.
deleteAnimalType: This function deletes an animal category. It finds the animal category by its ID (type_id parameter) and removes it from the database. It responds with a success message and the deleted animal category.

EssentialController.js

Create Essential Type: This function creates a new essential category. It checks if the essentialName already exists in the database (case-insensitive). If it exists, it returns an error message. Otherwise, it creates a new essential category using the Essential model with the provided essentialName, imageUrl, and user (from req.user.id). It responds with a success message and the created essential category.
Get All Essential Types: This function retrieves all essential categories from the database using the Essential model. It responds with a success message and an array of essential categories.
Update Essential Type: This function updates an existing essential category. It finds the essential category by its ID (type_id parameter) and updates it with the data from req.body. The { new: true } option ensures that the updated essential category is returned as the response. It responds with a success message and the updated essential category.
Delete Essential Type: This function deletes an essential category. It finds the essential category by its ID (type_id parameter) and removes it from the database. It responds with a success message and the deleted essential category.

medicalController.js

Create Medical Care Type: This function creates a new medical care category. It checks if the medicalCareName already exists in the database (case-insensitive). If it exists, it returns an error message. Otherwise, it creates a new medical care category using the Medical model with the provided medicalCareName, imageUrl, and user (from req.user.id). It responds with a success message and the created medical care category.
Get All Medical Care Types: This function retrieves all medical care categories from the database using the Medical model. It responds with a success message and an array of medical care categories.
Update Medical Care Type: This function updates an existing medical care category. It finds the medical care category by its ID (type_id parameter) and updates it with the data from req.body. The { new: true } option ensures that the updated medical care category is returned as the response. It responds with a success message and the updated medical care category.
Delete Medical Care Type: This function deletes a medical care category. It finds the medical care category by its ID (type_id parameter) and removes it from the database. It responds with a success message and the deleted medical care category.

treatmentController.js

Create Treatment Type: This function creates a new treatment category. It checks if the TreatmentTypeName already exists in the database (case-insensitive). If it exists, it returns an error message. Otherwise, it creates a new treatment category using the Treatment model with the provided TreatmentTypeName, imageUrl, and user (from req.user.id). It responds with a success message and the created treatment category.
Get All Treatment Types: This function retrieves all treatment categories from the database using the Treatment model. It responds with a success message and an array of treatment categories.
Update Treatment Type: This function updates an existing treatment category. It finds the treatment category by its ID (type_id parameter) and updates it with the data from req.body. The { new: true } option ensures that the updated treatment category is returned as the response. If the treatment category is not found, it returns an error message. It responds with a success message and the updated treatment category.
Delete Treatment Type: This function deletes a treatment category. It finds the treatment category by its ID (type_id parameter) and removes it from the database. If the treatment category is not found, it returns an error message. It responds with a success message and the deleted treatment category.

orderController.js

newOrder function: This function is used to create a new order.
- It extracts the required information from the request body, such as shippingInfo, orderItems, and billingInfo.
- It creates a new order using the Order.create method, passing the extracted information along with the current date and the user ID from the request.
- It sends an email to the user with the order details using the sendEmail function.
- Finally, it sends a JSON response with the created order.
getSingleOrder function: This function retrieves a single order by its ID.
- It uses the Order.findById method to find the order with the specified ID and populates the user field with the corresponding user's name and email.
- If the order is not found, it returns an error.
- Otherwise, it sends a JSON response with the retrieved order.
myOrders function: This function retrieves all orders for the logged-in user.
- It uses the Order.find method to find orders where the user field matches the ID of the logged-in user.
- It sends a JSON response with the retrieved orders.
getAllOrders function: This function retrieves all orders (for admin use).
- It uses the Order.find method to find all orders.
- It calculates the totalAmount by summing up the totalPrice of each order.
- It sends a JSON response with the total amount and the retrieved orders.
updateOrderStatus function: This function updates the status of an order (for admin use).
- It uses the Order.findById method to find the order with the specified ID.
- If the order is not found, it returns an error.
- It checks if the order status is already "Delivered" and returns an error if it is.
- It updates the stock of each product in the order by calling the updateStock function.
- It updates the order status based on the status provided in the request body and sets the deliveredAt field if the status is "Delivered".
- It saves the updated order and sends a JSON response.
updateStock function: This function updates the stock of a product.
- It takes the product ID and quantity as parameters.
- It retrieves the product using the Product.findById method.
- It subtracts the quantity from the product's Stock property and saves the product.
deleteOrder function: This function deletes an order (for admin use).
- It uses the Order.findByIdAndRemove method to find and remove the order with the specified ID.
- If the order is not found, it returns an error.
- If the order is found, it sends a JSON response indicating success.

ProductController.js

createProduct: This function is used to create a new product. It receives the product data from the request body, sets the user field to the current user's ID, creates a new product using the Product model, and returns the created product as a JSON response. If an error occurs, it calls the next function with the error.
getProductDetails: This function retrieves the details of a single product. It takes the product ID from the request parameters, finds the product using the Product model, and returns the product details as a JSON response. If the product is not found, it calls the next function with an error.
updateProduct: This function is used to update a product. It first finds the product using the provided ID, then updates the product with the new data from the request body using the Product.findByIdAndUpdate method. It returns the updated product as a JSON response. If the product is not found, it calls the next function with an error.
deleteProduct: This function deletes a product. It finds the product using the provided ID and removes it using the Product.findByIdAndRemove method. It returns a JSON response indicating the success of the deletion. If the product is not found, it calls the next function with an error.
showAllProducts: This function retrieves all products with optional filters and pagination. It allows filtering by keyword, animal, treatment, dailyEssential, and medicalCare. The filters are applied to the Product.find query to retrieve the matching products. The results are paginated using the page and pageSize parameters. The function returns a JSON response with the count of total products, the current page, the number of pages, and the retrieved products. If an error occurs, it calls the next function with the error.
createProductReview: This function allows users to create or update a review for a product. It receives the review data from the request body, including the rating, comment, and product ID. It checks if the user has already reviewed the product and updates the existing review or adds a new review accordingly. It calculates the average rating for the product based on all reviews and updates the ratings, numOfReviews, and reviews fields of the product. It returns the created or updated review as a JSON response.
getProductReviews: This function retrieves all reviews for a product. It takes the product ID from the request query parameters, finds the product using the Product model, and returns the reviews as a JSON response. If the product is not found, it calls the next function with an error.
deleteReview: This function allows users to delete their review for a product. It takes the product ID and review ID from the request query parameters. It finds the product using the product ID, filters out the specified review from the product's reviews array, recalculates the average rating and number of reviews, and updates the product using Product.findByIdAndUpdate. It returns a JSON response indicating the success of the deletion.
getAdminProducts: This function is specifically for administrators. It retrieves all products using the Product.find method and returns them as a JSON response.

usereController.js

Importing required modules and files:
- ErrorHandler: A custom error handling utility.
- catchAsyncErrors: Middleware function to catch asynchronous errors.
- User: The user model for interacting with the database.
- sendToken: Utility function to send a JWT token as a response.
- sendEmail: Utility function to send emails.
- crypto: Node.js crypto module for generating password reset tokens.
- logger: Custom logger utility for logging messages.
Registering a User (registerUser function):
- Create a new user in the database using the provided name, email, and password.
- Send a JWT token as a response.
Logging in a User (loginUser function):
- Check if both email and password are provided.
- Find the user in the database based on the provided email.
- Compare the provided password with the user's stored password.
- Send a JWT token as a response if the credentials are valid.
Logging out a User (logout function):
- Clear the JWT token cookie in the response.
- Send a success message.
Forgot Password (forgotPassword function):
- Find the user based on the provided email.
- Generate a password reset token and set an expiry time for it.
- Save the user with the reset token and expiry time.
- Send a password reset email to the user with the reset token URL.
Reset Password (resetPassword function):
- Verify the reset token from the request parameters.
- Find the user with a valid reset token and not expired.
- Update the user's password with the new password from the request body.
- Clear the reset token and expiry time.
- Send a JWT token as a response.
Get User Details (getUserDetails function):
- Find the user details based on the user ID from the JWT token.
- Send the user details as a response.
Update Password (updatePassword function):
- Verify the user's current password.
- Check if the new password matches the confirmation password.
- Update the user's password with the new password.
- Send a JWT token as a response.
Update User Profile (updateProfile function):
- Update the user's name and email based on the request body.
- Send a success message and the updated user profile.
Get All Users (Admin) (getAllUser function):
- Fetch all users from the database.
- Send the list of users as a response.
Get Single User (Admin) (getSingleUser function):
- Find a user based on the provided user ID.
- Send the user details as a response.
Update User Role (Admin) (updateUserRole function):
- Update the user's name, email, and role based on the request body.
- Send a success message as a response.
Delete User (Admin) (deleteUser function):
- Find a user based on the provided user ID.
- Remove the user from the database.
- Send a success message as a response.

varietyController.js

Importing required modules and files:
- catchAsyncError: Middleware function to catch asynchronous errors.
- Variety: The variety model for interacting with the database.
- ErrorHandler: A custom error handling utility.
Add Varieties (addVarieties function):
- Create new varieties in the database using the data from the request body.
- Send a success response with the created varieties.
Get Variety Details (getVaritiesDetails function):
- Find a variety based on the provided variety ID.
- Send the variety details as a response.
Update Varieties (Admin) (updateVarieties function):
- Find a variety based on the provided variety ID.
- Update the variety with the data from the request body.
- Send a success response with the updated variety.
Delete Varieties (Admin) (deleteVarieties function):
- Find a variety based on the provided variety ID.
- Remove the variety from the database.
- Send a success response.

database-Connection/database.js

Importing required modules:
- mongoose: The Mongoose library for MongoDB interactions.
Configuring Mongoose settings:
- mongoose.set("strictQuery", false): This line sets the strictQuery option to false, which allows Mongoose to execute queries even if they contain fields not defined in the schema.
Connect to the MongoDB database:
- The connectDatabase function establishes a connection to the MongoDB database using the mongoose.connect method.
- It uses the process.env.MONGO_URL environment variable to specify the URL of the MongoDB database.
- The useNewUrlParser and useUnifiedTopology options are passed to the mongoose.connect method for proper configuration.
- If the connection is successful, the message "connected..." is logged to the console.
Exporting the connectDatabase function to be used by other parts of the application.

middleware

auth.js

Importing required modules:
- catchAsyncErrors: A middleware function that wraps asynchronous route handlers and catches any errors that occur.
- ErrorHandler: A custom error handling utility.
- jwt: The JSON Web Token library for working with tokens.
- User: The User model representing the user collection in the database.
Middleware function for user authentication (isAuthenticatedUser):
- This middleware function is responsible for authenticating the user based on the provided token.
- It expects the token to be stored in the token field of the request cookies.
- If no token is found, it returns an authentication error.
- If a token is found, it verifies the token using the jwt.verify method and the process.env.JWT_SECRET environment variable.
- If the token is valid, it retrieves the user information from the database based on the decoded token data and attaches it to the req.user object.
- Finally, it calls the next function to pass control to the next middleware or route handler.
Middleware function for role authorization (authorizeRoles):
- This middleware function takes a variable number of role parameters (...roles) that are allowed to access a specific resource.
- It returns another middleware function that will be used as a route handler.
- The returned middleware function checks if the user's role (req.user.role) is included in the provided roles.
- If the user's role is not included, it returns a forbidden error (403).
- If the user's role is allowed, it calls the next function to pass control to the next middleware or route handler.

catchAsyncError.js

This higher-order function is useful for handling asynchronous operations in route handlers and ensuring any errors are properly caught and forwarded to the error-handling middleware.

The higher-order function takes theFunc as an argument.
It returns another middleware function with the signature (req, res, next).
Inside the returned middleware function, theFunc(req, res, next) is called and executed.
The return value of theFunc is wrapped in a Promise.resolve() call to ensure it resolves to a promise.
The promise is then chained with .catch(next) to handle any errors that occur during the execution of theFunc.
If an error occurs, the next function is called with the error as an argument, passing control to the next error-handling middleware.

error.js

This error handling middleware allows you to handle specific types of errors and provide custom error messages and status codes in your Express application.

The middleware function takes four parameters: err, req, res, and next.
It checks if the err object has a statusCode property. If not, it sets it to 500 (Internal server error).
It checks if the err object has a message property. If not, it sets it to "Internal server error".
The middleware then checks for specific types of errors and modifies the err object accordingly:
- If the error is a MongoDB CastError, it creates a new ErrorHandler with a custom message and a 400 status code.
- If the error is a Mongoose duplicate key error (code 11000), it creates a new ErrorHandler with a custom message and a 400 status code.
- If the error is a JsonWebTokenError, it creates a new ErrorHandler with a custom message and a 400 status code.
- If the error is a TokenExpiredError, it creates a new ErrorHandler with a custom message and a 400 status code.
Finally, the middleware sends a JSON response with the appropriate status code and error message.

userRoutes.js

/register - POST request to register a new user. Calls the registerUser controller function.
/login - POST request to log in a user. Calls the loginUser controller function.
/password/forgot - POST request to initiate the password reset process. Calls the forgotPassword controller function.
/password/reset/:token - PUT request to reset the password using a reset token. Calls the resetPassword controller function.
/me - GET request to fetch the current user's details. Requires authentication (isAuthenticatedUser middleware). Calls the getUserDetails controller function.
/password/update - PUT request to update the user's password. Requires authentication. Calls the updatePassword controller function.
/me/update - PUT request to update the user's profile. Requires authentication. Calls the updateProfile controller function.
/admin/users - GET request to fetch all users (admin access required). Requires authentication and authorization with the role "admin". Calls the getAllUser controller function.
/admin/user/:id - GET, PUT, DELETE requests for a single user (admin access required). Requires authentication and authorization with the role "admin". Calls the getSingleUser, updateUserRole, and deleteUser controller functions respectively.
/logout - GET request to log out the user. Calls the logout controller function.

varietyRoutes.js

POST /varieties/create - Creates a new variety. Requires authentication and authorization with the role "admin" (isAuthenticatedUser and authorizeRoles middlewares). Calls the addVarieties controller function.
GET /varieties/:id - Retrieves details of a single variety by its ID. Calls the getVaritiesDetails controller function.
PUT /admin/varieties/:id - Updates a variety by its ID. Requires authentication and authorization with the role "admin". Calls the updateVarieties controller function.
DELETE /admin/varieties/:id - Deletes a variety by its ID. Requires authentication and authorization with the role "admin". Calls the deleteVarieties controller function.

orderRoutes.js

POST /order/new - Creates a new order. Requires authentication (isAuthenticatedUser middleware). Calls the newOrder controller function.
GET /order/:id - Retrieves details of a single order by its ID. Requires authentication (isAuthenticatedUser middleware). Calls the getSingleOrder controller function.
GET /myorders - Retrieves all orders placed by the currently authenticated user. Requires authentication (isAuthenticatedUser middleware). Calls the myOrders controller function.
GET /admin/orders - Retrieves all orders. Requires authentication and authorization with the role "admin" (isAuthenticatedUser and authorizeRoles middlewares). Calls the getAllOrders controller function.
PUT /admin/order/:id - Updates the status of an order by its ID. Requires authentication and authorization with the role "admin". Calls the updateOrderStatus controller function.
DELETE /admin/order/:id - Deletes an order by its ID. Requires authentication and authorization with the role "admin". Calls the deleteOrder controller function.

productsRoutes.js

POST /product/create - Creates a new product. Requires authentication and authorization with the role "admin" (isAuthenticatedUser and authorizeRoles middlewares). Calls the createProduct controller function.
GET /products - Retrieves all products. Does not require authentication. Calls the showAllProducts controller function.
GET /product/:id - Retrieves details of a single product by its ID. Does not require authentication. Calls the getProductDetails controller function.
PUT /admin/product/:id - Updates a product by its ID. Requires authentication and authorization with the role "admin". Calls the updateProduct controller function.
DELETE /admin/product/:id - Deletes a product by its ID. Requires authentication and authorization with the role "admin". Calls the deleteProduct controller function.
PUT /review - Creates a new review for a product. Requires authentication. Calls the createProductReview controller function.
GET /review - Retrieves all reviews for a product. Does not require authentication. Calls the getProductReviews controller function.
DELETE /review - Deletes a review. Requires authentication. Calls the deleteReview controller function.
GET /admin/products - Retrieves all products for the admin. Requires authentication and authorization with the role "admin". Calls the getAdminProducts controller function.

utils

errorhandler.js
The ErrorHandler class is defined, extending the Error class.
The constructor function is defined with two parameters: message and statusCode.
Inside the constructor, the super() method is called with the message parameter to set the error message.
The statusCode parameter is assigned to the statusCode property of the ErrorHandler instance.
The Error.captureStackTrace() method is called to capture the stack trace of the error.
Finally, the ErrorHandler class is exported to be used in other modules.
jwtToken.js
The sendToken function is defined with three parameters: user, statusCode, and res (the response object).
Inside the function, the getJWTToken() method is called on the user object to generate a JWT token.
Options for the cookie are defined, including the expiration date based on the value of COOKIE_EXPIRES from the environment variables.
The res.cookie() method is called to set the token cookie with the generated JWT token and the defined options.
Finally, a JSON response is sent back with the specified statusCode, along with the user object and the generated token.
sendEmail.js
The sendEmail function is defined with a single parameter options, which is an object containing the email details such as email, subject, message, and html (optional).
Inside the function, a transporter is created using nodemailer.createTransport(). The transporter configuration includes the SMTP host, port, service, and authentication credentials (username and password) retrieved from environment variables.
The mailOptions object is created, which contains the email details such as the sender, recipient, subject, text body, and HTML body.
The transporter.sendMail() method is called with the mailOptions to send the email asynchronously.

app.js

The Express application is created with const app = express().
Middleware and dependencies are imported:
- errorMiddleware is imported from './middleware/error'. This middleware handles error responses.
- cookieParser is imported from 'cookie-parser'. It parses cookie headers and populates req.cookies with the parsed cookies.
- dotenv is imported to load environment variables from the "backend/config/config.env" file.
- cors is imported to enable Cross-Origin Resource Sharing.
Configuration is loaded with dotenv.config({path:"backend/config/config.env"}), which reads environment variables from the specified file.
Middleware is added to the application:
- cors() middleware is used to enable CORS.
- cookieParser() middleware is added to parse cookies.
- express.json() middleware is added to parse JSON request bodies.
Route files are imported:
- userRoutes, animalTypeRoutes, treatmentTypeRoute, productsRoute, dailyEssentialRoutes, medicalCareRoute, orderRoutes, and varietyRoutes are imported.
Routes are mounted to the application using app.use():
- All routes from each route file are mounted under the "/api/v1" path.
A wildcard route is added to handle any unmatched routes. It responds with a 404 status and an error message.
The errorMiddleware is added as the last middleware to handle errors in the application.
The application is exported as app.

servere.js

The dotenv.config() function is called to load environment variables from the "backend/config/config.env" file.
The connectDatabase function is called to establish a connection with the database.
The process.on("uncaughtException", ...) event handler is set up to handle uncaught exceptions. If an uncaught exception occurs, the error message is logged, and the server is shut down by calling process.exit(1).
The process.env.PORT variable is used to determine the port on which the server will listen.
The server is started by calling app.listen(port, ...), and a message is logged to indicate that the server is running.
The process.on("unhandledRejection", ...) event handler is set up to handle unhandled promise rejections. If an unhandled promise rejection occurs, the error message is logged, and the server is shut down by calling server.close() and then process.exit(1).

Important Notes for developers:

there are some changes you have to do in code during development time to run it locally

app.js (development)

app.use(cors({
    origin: 'http://localhost:3000',
    credentials: true,
    methods: ['GET','PUT','POST','OPTIONS'] 

}));

app.js (production) -> as in azure portal cors is enabled and frontend url is added.

app.use(cors());

jwtToken.js (development) -> httpOnly: true

const sendToken = (user,statusCode, res) =>{
    const token = user.getJWTToken();

    //options for cookie
    const options = {
        expires: new Date(
            Date.now() + process.env.COOKIE_EXPIRES * 24 * 60 * 60 *1000
        ),
        httpOnly: true,
    };

    res.status(statusCode).cookie("token", token,options).json({
        success:true,
        user,
        token,
    })
}

jwtToken.js (production) -> comment httpOnly: true , and add
- ```
   sameSite: 'none'
```

  const sendToken = (user,statusCode, res) =>{
    const token = user.getJWTToken();

 
    //options for cookie
    const options = {
        expires: new Date(
            Date.now() + process.env.COOKIE_EXPIRES * 24 * 60 * 60 *1000
        ),
        //for dev hhtpOnly:true
       // httpOnly: true,
       secure: true,
       sameSite: 'none'
    };

    res.status(statusCode).cookie("token", token,options).json({
        success:true,
        user,
        token,
    })
 }

controllers/userController.js (development) In logout function

exports.logout = catchAsyncErrors(async(req,res,nex)=>{

   res.cookie("token",null,{
       expires: new Date(Date.now()),
       httpOnly:true
   })

   res.status(200).json({
       success:true,
       message:" Logged Out",
   })
})

controllers/userController.js (development) In logout function

exports.logout = catchAsyncErrors(async(req,res,nex)=>{

   res.cookie("token",null,{
       expires: new Date(Date.now()),
       //for dev hhtpOnly:true
      // httpOnly: true,
      secure: true,
      sameSite: 'none'
   })

   res.status(200).json({
       success:true,
       message:" Logged Out",
   })
})

Name		Name	Last commit message	Last commit date
Latest commit History 16 Commits
.github/workflows		.github/workflows
backend		backend
docs		docs
.gitignore		.gitignore
Deployment.md		Deployment.md
README.md		README.md
jsdoc.json		jsdoc.json
package-lock.json		package-lock.json
package.json		package.json

VetMedManTest/Backend-Updated

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vetmedBackend

Node.js Backend Documentation

Introduction

Here's a breakdown of how the folders align with the MVC pattern:

Installation and Setup

Directory Structure

Models

1. userModel.js

2.Product Model

3.OrderModel

Export

4.Variety Model

Schema Fields

Export

5.categories/animal.js (Model)

Schema Fields

Timestamps

Export

6.Essential Type Model

7.Medical Type Model

8.Treatment Type Model

Controllers

animalController

EssentialController.js

medicalController.js

treatmentController.js

orderController.js

ProductController.js

usereController.js

varietyController.js

database-Connection/database.js

middleware

auth.js

catchAsyncError.js

error.js

userRoutes.js

varietyRoutes.js

orderRoutes.js

productsRoutes.js

utils

errorhandler.js

jwtToken.js

sendEmail.js

app.js

servere.js

Important Notes for developers:

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