M.E.R.N full stack project || Multi-vendor MERN project in Telugu

The application integrates a full-stack setup using Express for the backend, React for the frontend, and MongoDB as its database. It supports user authentication with email and password functionality (e.g., usmail.com or lil.com). Features include restaurant listings categorized by cuisine type like Chinese or desserts such as vanilla ice cream. Users can access promotions like 50% off on orders above $199 while managing their preferences through options to delete items or confirm selections.

Developing fullstack applications involves creating both frontend interfaces and backend systems. The process starts by setting up authentication features like sign-up, login, and user management using technologies such as Node.js or MongoDB for the backend. Continuous Integration (CI) and Continuous Deployment (CD) streamline development workflows to ensure seamless updates. Real-time application examples include platforms like Amazon or OLX that require robust dashboards built with tools like React for UI design.

Begin by setting up the environment for backend development using Node.js. Install necessary dependencies like Express, Mongoose, dotenv (EnV), and body-parser via npm commands. Create an index file to initialize the server with essential configurations such as defining a port (e.g., 4000) and adding basic functionality to log messages when the server starts running. Use console.log statements for feedback during setup and ensure that responses are sent correctly from endpoints.

To connect to a MongoDB database, ensure the connection is properly set up by adding necessary IP addresses (e.g., 0.0.0.0) and creating users with appropriate credentials like username and password in your project configuration files or environment variables (env). Use Mongoose as the package for managing connections; initialize it using process.env variables containing your database URI details, followed by promise-based handling of successful connections or errors during setup.

A vendor registration system is developed using JavaScript, MongoDB, and Express. The process involves creating models for vendors with properties like username, email (unique), and password along with validation requirements. Controllers handle the logic of registering a new vendor by validating input fields from request bodies while encrypting passwords using bcrypt.js before saving them to the database. Routes are defined in Express to manage HTTP requests such as POST /register for user registration endpoints.

The vendor login process involves a synchronous function that validates user credentials. It takes email and password as parameters, compares them against stored data using bcrypt for secure verification. If the credentials match, it returns a success response in JSON format; otherwise, an error message indicating invalid username or password is sent with status 404.

JWT tokens are used for authentication, with a process involving variables like ID and secret keys. The token creation requires defining parameters such as expiration time to ensure security. Properly setting up environment variables (e.g., secrets) is crucial in the generation of secure tokens.

Building a Vendor Management System The vendor management system is designed with properties such as name, area, category, region, offer details and image. A schema defines these attributes using Mongoose for validation and data structure consistency. The implementation includes creating models to reference vendors by ID while ensuring unique entries through validations like required fields.

Token Verification & Image Upload Integration JWT tokens are used for secure authentication in the application; they validate requests via headers before proceeding further. Error handling mechanisms ensure proper responses during token verification failures or server errors. Additionally, an image upload feature integrates Multer storage functionality into the Node.js environment to handle single-image uploads efficiently.

The process involves creating asynchronous functions to manage vendor records, including fetching all vendors or individual ones. Using promises and async/await syntax ensures smooth handling of requests and responses. Errors are logged for troubleshooting, while successful operations confirm actions like registration or updates through messages.

A function is designed to retrieve vendor details using a specific ID. It employs an asynchronous arrow function with error handling through try-catch blocks. If the provided vendor ID exists, it returns a success response (status code 200) along with the corresponding data; otherwise, it sends a 404 status indicating that no record was found. The endpoint for this functionality follows the format 'localhost:4000/singlevendor/:id', where ':id' represents the unique identifier of the desired vendor.

Building a Product Management System The system is designed to manage products with properties like name, category, image, bestseller status, and description. MongoDB schemas are used for defining product attributes and ensuring data validation. Functions handle operations such as adding new products by parsing request bodies and saving them into the database while managing errors effectively.

Implementing Routes for CRUD Operations Routes are established using Express.js to perform Create (add), Read (get by firm ID), Update, and Delete operations on products. Each route links specific controller functions that interact with the database based on parameters like IDs or body content in requests. Error handling ensures appropriate responses when actions fail due to missing or invalid data.

The process begins by initializing a new Git repository using the 'git init' command. Essential setup steps include creating an initial commit, adding files to staging with 'git add .', and committing changes using descriptive messages via 'git commit -m'. The main branch is established as "main" through branching commands. Remote repositories are configured or removed if necessary, followed by pushing code while excluding unnecessary files like environment variables and node modules.

The process of deploying web services involves building and running applications from a repository, setting up runtime environments, and configuring commands for installation, build execution, deployment initiation, and application start. Environment variables like secret keys are defined to ensure secure operations. Continuous Integration (CI) automates code integration while Continuous Deployment (CD) ensures seamless updates by modifying configurations such as ports or URLs dynamically during the process. Commands like 'get status' followed by 'push' finalize deployments on specified ports such as 4000.

Begin by creating the backend for your dashboard using commands like 'npx create-react-app' or alternatives such as 'npm create vite@latest'. After setting up, navigate to your project directory with 'cd', install dependencies, and start the development server. Use commands like 'npm run dev' to launch on localhost (e.g., port 5174). Organize files including app.jsx and index.css while utilizing shortcuts from extensions supporting ES6/ES7 syntax.

The dashboard structure includes pages, components, a vendor section with functionalities like registration forms, product addition forms, collections display for all products. Key files include Navbar.jsx and Sidebar.jsx within the components folder. Forms are categorized into login form (vendorLogin), add firm form (addFirm), register vendor form (registerVendor), and add product form (addProduct). The landing page component is styled using CSS imported in app.jsx to define elements such as background.

The navbar is styled using imported Google Fonts, ensuring a cohesive font family throughout. The section height is set to 100 pixels with display flex for layout flexibility. Justify-content property spaces elements evenly between the title and user log sections. Padding adjustments include zero on top/bottom and 20px left/right, while box-sizing ensures consistent element sizing.

The focus is on creating a responsive sidebar component for web applications. The design includes setting the width to 20% of the screen, with height inheriting up to 80 vertical height units (vh). Styling involves using unordered lists (

) and list items (
• ), ensuring proper spacing with margins and padding while maintaining responsiveness through relative font sizes like '1rem'. Additional features include light background colors, pointer cursors for interactivity, and solid red borders as visual markers.

A login form is designed using JSX, starting with labels for email and password fields. The input field types are set to 'text' for the email and 'password' for the password, each having placeholders like "Enter your email" or "Enter your password." A submit button styled as 50% width of its container is added alongside CSS properties such as solid red borders, flex display settings (justify-content: center; align-items: center), column direction layout adjustments, margin-top values (-100px initially then adjusted to 230px). Input elements have max-widths of 55%, padding approximations around text size (22-30 pixels), gray border styling at one pixel thickness along with rounded corners via a radius setting.

A user registration form is designed with three main properties: labels and input fields for username, email, and password. Each field includes descriptive placeholders like 'Enter your name' to guide users. The layout uses CSS styling such as 100% width with a maximum of 55%, ensuring responsiveness while maintaining structure. Additionally, the login functionality is integrated alongside the register section within unified development elements.

Designing the firm UI product involves creating a form section that includes fields for firm name, area, category, region, offer details (text type), and an image upload option. The layout incorporates labels styled with specific font sizes and weights alongside input fields tailored to each data type. A submit button finalizes the form functionality while ensuring proper registration authentication is in place.

The process involves creating a user interface for adding products, including fields like product name, price, category, image upload options and description. Input fields are styled with specific margins: 10 pixels at the bottom and top adjustments of 2 pixels to ensure proper spacing. A table format is used in sections where necessary to organize data effectively.

React Router facilitates navigation in a React application with over 1 million weekly downloads. To set it up, install the package using npm and configure BrowserRouter tags in your main component file (e.g., App.jsx). Define routes within curly braces to specify individual components like landing pages or login/register forms. Use state management to toggle between showing different components based on user actions, such as clicking buttons linked to handler functions that update states.

The process involves setting up conditional rendering for components like login, register, forms, and products. Initial states are set to false for visibility toggles such as 'showRegister' or 'showLog'. Handlers manage state changes triggered by events like clicks; these include functions such as showFormHandler or showProductHandler that toggle specific component displays. Components dynamically render based on the updated state values.

The input fields, including checkboxes for categories like South Indian, North Indian, Chinese, and Bakery are styled with specific CSS rules. Checkbox containers use a display of flex with borders in solid colors (red or green) depending on the context. The maximum width is set to 85% or 90%, ensuring responsive design while aligning items centrally using justify-content-center and text-align properties. Margins are adjusted for proper spacing between elements.

A vendor registration form is created using JavaScript and React, integrating an API hosted on localhost. The form includes input fields for username, email, and password managed by state hooks. A handleSubmit function processes the submission through a POST request to the '/vendor/register' endpoint with JSON-formatted data. Successful responses alert users of successful registration while errors display failure messages.

The implementation involves creating a login handler using React's useState to manage email and password states. The function captures user input, prevents default form submission behavior, and sends the data via POST request to an API endpoint for authentication. Upon successful response, it stores the token in local storage and displays a success message; otherwise, it logs errors or sets error messages accordingly. Input fields dynamically update their values based on state changes triggered by event handlers.

The process involves registering a component for product management, handling login functionalities, and managing state changes. A function is used to handle user input like email (e.g., gmail.com) and password (1234), leading to successful registration or login responses. The system includes components such as 'showLoginHandler' that manage visibility states using functions like setShowWelcome(false). Upon submission of valid credentials, the dashboard welcomes users with tailored content based on their roles.

Dynamic Form Handling and Data Submission The process involves creating dynamic forms with input fields for firm name, area, category selection via checkboxes, region specification, offers like discounts on cuisines (e.g., South Indian), and image uploads. State management is implemented using React's useState to handle form data dynamically. Functions manage events such as changes in inputs or selections; they update states accordingly while ensuring validation through conditions like checking if a value exists before updating categories.

API Integration and Error Management Form submission integrates with an API endpoint using POST requests where headers include authentication tokens retrieved from local storage. The body of the request contains appended form data including text values and uploaded files managed by FormData instances. Responses are handled to confirm success or catch errors during operations; error messages guide debugging when failures occur.

The process involves creating an 'Add Product' component using React, where product details like name, price, category, image URL, best-seller status (true/false), and description are managed through state variables. A form is designed to capture these inputs from the user while handling events such as onChange for real-time updates of state values. The handleAddProduct function sends this data via POST request to an API endpoint after validating authentication tokens; upon success or failure responses from the server ('product added successfully' or error messages) are displayed accordingly. Additional features include toggling best-seller status with radio buttons and uploading images.

A vendor can only associate with one firm in the system. If a second attempt is made to add another firm, an error response will be triggered indicating failure due to this restriction. The backend project ensures that each vendor's unique ID links them exclusively to their designated firm's data, preventing duplication or conflicts.

A dynamic product table is created using React, leveraging useState and useEffect hooks. Products are fetched from a local API (localhost:4000), parsed into JSON format, and stored in state for rendering. The table displays essential details like name, price, vendor record along with options to delete or upload products dynamically. CSS styling ensures proper layout with features such as border collapse and responsive design up to 80% viewport width.

The process involves an on-click event triggering a delete function with the product ID as its parameter. A confirmation box asks users if they are sure about deleting, and upon approval, an API call using the DELETE method is made to remove the product. If successful, it filters out deleted products from the list and displays a success alert; otherwise, it logs errors in case of failure.

The application includes a single-page design with essential features like login, register buttons, and product displays. It uses state management to toggle between showing all products or specific views through handlers that set states accordingly. Local storage is utilized for managing user sessions by storing tokens and handling logouts via removal of stored items. The interface incorporates confirmation prompts for actions such as logging out to ensure user intent.

The text outlines a process for dynamically displaying names, managing login credentials, and interacting with local storage. It includes setting up components to handle firm name display using console logs and storing data like passwords securely in local storage. The workflow involves retrieving items from the local storage, updating or removing them as needed while ensuring proper API integration through URLs.

The text discusses managing state with default values, specifically focusing on conditional rendering of a title. It explains using local storage to retrieve or set the initial state for showing a firm title. Functions are implemented to toggle visibility based on conditions, ensuring dynamic updates in components.

The logic implementation begins with reading all products, ensuring their line numbers match a specific condition (length equal to Z). If no products are added or conditions aren't met, handlers like 'show firm Handler' and 'show product Handler' manage the display of messages. For users not logged in, an automatic alert prompts them to log in before accessing functionalities. The system ensures seamless handling through conditional checks for displaying appropriate responses based on user actions.

A custom 404 error page is created within the application using JSX components. The design includes styling with CSS, ensuring full-screen coverage (100% vertical height) and proper flex direction for layout alignment. Key elements include an H1 header styled with extra-large fonts to emphasize the message, accompanied by smaller text content in dark blue tones for user guidance. Navigation options like 'Go Back' are implemented as simple links or buttons to enhance usability.

The text discusses various aspects of styling using CSS, including changing font families with embedded codes. It highlights tools like Coolors for generating color shades and combinations to enhance design aesthetics. Specific elements such as background colors, H3 tags, vendor login/register components are styled with properties like border radius (10px), button backgrounds (blue), white text color, padding adjustments (10px top/bottom) and margin settings.

The process begins by setting up the project in Visual Studio terminal, initializing it with Git commands like 'git add', 'commit', and creating branches. The backend is configured to run on localhost:4000, ensuring API URLs are correctly linked for live deployment. After pushing changes using Git commands, the application is deployed successfully through Render or similar platforms after authorization steps. Vendors and products data can be managed via forms that allow adding categories, prices, descriptions while also enabling deletion of entries when needed.

The focus is on condensing information into concise summaries by extracting core ideas and eliminating unnecessary details. The goal is to maximize clarity and value in minimal text, ensuring the essence of the content remains intact while avoiding redundancy or irrelevant elements.