WhatsApp Clone with MERN Stack | Real-Time Chat App using Socket.IO & React.js | Full-Stack Project

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⚡🔥 The Ultimate 9+ Hour WhatsApp Clone Masterclass — Part 1! 🔥

In this mega session, we build the complete backend of a production-ready WhatsApp Clone, plus the login UI feature, all in one continuous 9+ hour shot!

This project uses the MERN stack (MongoDB, Express.js, React.js, Node.js) along with Socket.IO to enable real-time messaging, authentication, and advanced user features.


✅ What We Build in This 9+ Hour Part 1
Full backend from scratch
User register & login (Phone & Email OTP)
JWT token-based authentication & secure cookies
Socket.IO setup for real-time communication
Online/offline status & basic last seen
Conversation and message models & APIs
Profile update & story upload backend logic
Login UI & frontend auth integration
Protected routes setup

✨ Coming in Part 2
Full chat UI with live typing, online status, media sharing
Stories UI & profile customization
Themes, image uploads, and more

💻 Source Code & Repo
🟢 Whatsapp Data Repository Link (Free Starter)
👉 https://github.com/agraharidheeraj/wh...
🟢 Whatsapp Clone Source Code Link
👉 https://www.desistack.co.in/projects/...

💡 Why Watch This?
Real-world backend architecture
Master authentication & real-time chat logic
Boost your resume with a production-level project
Build a strong portfolio project from scratch

🎥 Check Out My Other Big Projects
Backend Development Masterclass (Full Series)
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Book Kart E-Commerce Series
👉    • 🚀 Book Kart Full-Stack E-Commerce Series |...  

DeepSeek AI Clone (Streaming Chat App)
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🔗 Stay Connected
YouTube — Desi Stack
GitHub — https://github.com/agraharidheeraj
Instagram — @desistack7
LinkedIn — Dheeraj Agrahari

⏱️ Timestamps:
00:00:00 Introduction & Project Overview
00:16:15 Project Setup & Clean Architecture
00:27:40 MongoDB & Express Setup
00:37:00 User Schema (Model)
00:44:00 Conversation & Message Schemas (Models)
00:54:10 Sending OTP to Email & Phone Number
01:07:35 Email & Phone OTP Service Implementation
01:37:40 Verify OTP API
01:45:30 JWT Token & Cookies Setup
01:50:50 OTP Logic & Verification Flow
02:03:28 Update User Profile API & Cloudinary Setup
02:20:28 Auth Middleware & User API
02:48:00 Conversation & Message APIs
03:27:00 Testing Chat APIs in Postman
03:33:33 Status Schema & API
03:52:45 Socket.IO Setup & Events
04:42:35 Integrating Socket.IO Middleware
04:47:40 Status Route Testing
04:54:54 Applying Socket Events to Chat & Status APIs
05:10:00 Page Setup, Routes, and API Services
05:25:48 Zustand Setup for State Management
05:34:00 Login UI & Auth Integration
07:39:00 Protected Routes & Middleware
07:55:00 Home Screen & Layout Setup
08:20:30 Sidebar UI Design
08:39:30 User Chat List UI
09:15:00 Final Testing & Wrap-Up

💬 If you enjoyed this marathon session, smash that LIKE ❤️, comment what features you'd like to see next, and subscribe to support my journey!

Let’s build the full WhatsApp clone together — feature by feature! 🚀🔥

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