Integrate and Enhance E-Commerce Full-Stack Application with Node.js Backend and Angular Frontend

[monster0318]

Description

This repository contains a full-stack e-commerce application built using Node.js for the backend and Angular for the frontend. The project aims to provide a seamless shopping experience by integrating robust product management, user authentication, shopping cart, and order processing features.

The current goal is to improve API integration, optimize frontend-backend communication, implement comprehensive error handling, and enhance user experience with real-time updates and validations.

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Tasks

• Connect Angular frontend with Node.js RESTful APIs for product CRUD operations
• Implement user authentication and authorization using JWT tokens
• Develop shopping cart features including add, remove, and update quantities
• Create order checkout flow with payment simulation or integration
• Add form validation and error feedback on frontend forms (login, signup, checkout)
• Implement real-time stock update notifications (optional with WebSocket)
• Write unit and integration tests for backend routes and Angular services
• Secure API endpoints with role-based access control
• Optimize API responses for faster frontend rendering
• Document API endpoints with Swagger or similar tool for frontend reference

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Code Snippet Examples

Node.js Express Middleware for JWT Authentication:

const jwt = require('jsonwebtoken');

function authenticateToken(req, res, next) {
  const authHeader = req.headers['authorization'];
  const token = authHeader && authHeader.split(' ')[1];
  
  if (!token) return res.sendStatus(401);
  
  jwt.verify(token, process.env.ACCESS_TOKEN_SECRET, (err, user) => {
    if (err) return res.sendStatus(403);
    req.user = user;
    next();
  });
}

module.exports = authenticateToken;

Angular Service for User Authentication:

import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root',
})
export class AuthService {
  private apiUrl = 'https://api.example.com/auth';

  constructor(private http: HttpClient) {}

  login(credentials: {email: string; password: string}): Observable<any> {
    return this.http.post(`${this.apiUrl}/login`, credentials);
  }

  logout(): void {
    localStorage.removeItem('token');
  }
}

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Benefits

• Provides a secure and scalable e-commerce platform
• Enhances user experience with responsive UI and real-time updates
• Ensures data consistency and security through backend validations and JWT authentication
• Facilitates easier maintenance and future feature additions with modular code
• Supports developer collaboration with clear API documentation and testing coverage

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