Modern Error Handling in Node.js Authentication | Custom Exceptions + Global Handlers 2025

🚀 Modern Error Handling in Node.js Authentication | Custom Exceptions + Global Handlers 2025

Master modern backend development by building a production-ready authentication system with comprehensive error handling, custom exceptions, and robust security features!

💻 Complete Tech Stack:
Backend: Node.js & Express.js
Database: MySQL with XAMPP
ORM: Prisma (Latest Version)
Validation: Zod Schemas
Security: bcrypt + JWT Tokens
Error Handling: Custom Exception Classes
Testing: Postman API Testing

Build Complete Authentication System | Node.js + Prisma + MySQL + Zod | JWT Auth Tutorial
https://youtu.be/7r9E7cqujgo?si=tnL4VKOhtR_3GjjJ

📁 Complete Project Structure:
AUTH/
├── 📁 controllers/
│ └── 📄 authController.js Authentication logic
├── 📁 exceptions/ error classes
│ ├── 📄 bad-request.js Request errors
│ ├── 📄 internal-server.js Internal Server errors
│ ├── 📄 not-found.js Found errors
│ ├── 📄 root.js exception class
│ ├── 📄 unauthorized.js Unauthorized errors
│ └── 📄 unprocessable-entity.js
422 Unprocessable Entity
├── 📁 middleware/
│ └── 📄 authMiddleware.js verification middleware Dependencies
├── 📁 prisma/
│ ├── 📁 migrations/ migrations
│ └── 📄 schema.prisma Database schema
├── 📁 routes/
│ ├── 📄 auth.js Authentication routes
│ └── 📄 index.js
├── 📁 schema/
│ └── 📄 user.js schemas
├── ⚙️ .env variables
├── 📄 .env.example Environment template
├── 🔒 .gitignore rules
├── 🛠️ errorhandler.js handler
├── 🚀 index.js setup
├── 📦 package-lock.json Dependency lock
├── 📦 package.json

🛡️ Advanced Error Handling System:
Custom Exception Classes:
BadRequestException - Invalid input data (400)
UnauthorizedException - Authentication failures (401)
NotFoundException - Resource not found (404)
UnprocessableException - Validation errors (422)
InternalServerException - Server errors (500)

🚀 What You'll Build:
✅ Core Features:
User Registration with email validation
Secure Login with JWT tokens
Password Hashing using bcrypt
Protected Routes with middleware
Input Validation using Zod schemas
Database Relations with Prisma ORM
Custom Error Classes for better debugging
Global Error Handler for consistent responses

🔐 Security Features:
JWT Token Authentication
Password Encryption (bcrypt)
Input Sanitization (Zod validation)
Error Standardization
SQL Injection Prevention (Prisma)

📋 API Endpoints:
POST /api/auth/register
POST /api/auth/login
GET /api/auth/getUser

🛠️ Key Files Breakdown:
File Purpose
authController.js Registration, login, user data logic
authMiddleware.js JWT token verification & protection
errorhandler.js Global error handling & responses
exceptions/ Custom error classes for different scenarios
schema.prisma Database models & relationships
user.js Zod validation schemas for input
auth.js API route definitions
index.js Express server configuration

📥 Required Downloads:

🛠️ Development Tools:
XAMPP: https://www.apachefriends.org/
Node.js: https://nodejs.org/
Postman: https://www.postman.com/downloads/
VS Code: https://code.visualstudio.com/

📚 Documentation:
Prisma: https://www.prisma.io/docs
Zod: https://zod.dev/
Express.js: https://expressjs.com/
JWT: https://jwt.io/

🔥 Advanced Features Covered:

Error Handling Mastery:
Custom exception inheritance
HTTP status code management
Structured error responses
Development vs production error handling
Security Best Practices:
JWT token expiration
Password complexity validation
SQL injection prevention
Input sanitization
Database Excellence:
Prisma migrations
Schema relationships
Query optimization
Connection pooling

🎯 Get Source Code:
GitHub Repository: https://github.com/Jitugopale/authentication_tutorial.git

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#security #bcrypt #postman #developer #codetutorial #nodejstutorial #databasedesign #websecurity #modernjavascript #prismaorm #customexceptions #production #errormanagement

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