Why Front‑End/Back‑End Separation Is Essential for Modern Web Apps

Why Choose Front‑End/Back‑End Separation

In modern web development, separating the front end from the back end has become a trend, as many companies move toward this architecture.

Traditional sites required front‑end developers only to convert UI designs into static HTML, while interaction logic and data exchange were handled by back‑end developers, leading to tightly coupled code and maintenance difficulties.

When back‑end developers also had to write front‑end code, they faced increased workload, uneven task distribution, slower development, and hard‑to‑maintain code.

Front‑end/back‑end separation solves these problems by assigning interaction logic to the front end and letting the back end focus on API provision, permission control, and computation.

Front‑end developers can run a local Node.js server, forward API requests to the back end via plugins, and develop independently, resulting in faster, more balanced development.

How to Achieve Separation

The project uses Vue (the full family), Node.js, and Express to build a single‑page application. The front end handles page rendering and AJAX calls to a Node.js middle layer; the back end provides APIs, manages sessions with Redis, and interacts with the database.

To simulate a production environment, the front end runs a local server, avoiding the need for a heavyweight Java/PHP setup and reducing learning costs.

If the local server is not started, static HTML cannot make AJAX requests due to browser cross‑origin restrictions. Node.js solves this by serving files and proxying API calls.

When front‑end development outpaces back‑end API implementation, mock data (e.g., via mockjs) can be used based on a predefined API specification, allowing independent front‑end progress and rapid integration later.

Why Introduce Node.js as a Middle Layer

Node.js serves as a front‑end server, enabling developers to focus on front‑end tasks without needing to understand the Java back end. Its asynchronous, non‑blocking I/O makes it well‑suited for handling many concurrent requests.

Deploying the Front‑End Server

The Node.js server’s responsibilities include serving static assets (HTML, JS, CSS, fonts, images) and forwarding AJAX requests to the back‑end server. Deployment steps are simple: bundle the front‑end code with Webpack, then use PM2 to start the server.

For more details, see the project code at https://github.com/chenjigeng/filmshopping and the author's blog.