Building the Frontend of POS Lite with React, Next.js and Material UI

Guadalupe Rosas developed POS Lite to provide a practical interface for real-world point of sale operations. The system integrates barcode scanner support to accelerate product search and transaction processing.

Why This Matters

In business applications, a disconnect between visual design and operational workflow leads to inefficiency; a POS system must prioritize speed and reliability over aesthetic complexity. Failing to implement centralized API services or structured state management in growing projects often results in duplicated code and maintainability bottlenecks.

Key Insights

• Modular Application Structure (2026): Organizing the project into /app, /components, /context, /services, and /types avoids bloating page logic.
• Centralized API Communication: Using Axios interceptors to inject JWT tokens from localStorage into Authorization headers ensures secure requests across all protected endpoints.
• Operational UX Design: Implementing real-time feedback notifications after create/update actions ensures users have immediate confirmation of data persistence.
• Hardware Integration: Incorporating barcode scanner support allows the frontend to read values and automatically trigger product searches in the sales module.

Working Examples

Reusable Axios configuration with request interceptors for JWT authentication.

import axios from "axios";
const api = axios.create({
baseURL: process.env.NEXT_PUBLIC_API_URL,
});
api.interceptors.request.use((config) => {
const token = localStorage.getItem("token");
if (token) {
config.headers.Authorization = `Bearer ${token}`;
}
return config;
});
export default api;

Practical Applications

• Use case: Retail Sales Module - Scanning barcodes to automatically add products to a transaction.

Pitfall: Placing API calls directly inside components - leads to code duplication as the number of screens increases.

• Use case: Inventory Management - Utilizing low stock alerts on dashboards to trigger restocking workflows.

Pitfall: Omitting frontend form validation - results in submitting invalid prices or quantities to the backend.

References:

• https://dev.to/guadalupe182/building-the-frontend-of-pos-lite-with-react-nextjs-and-material-ui-4id8