Node.js项目文件结构分析：是否采用MVC模式？

Hey there! Let's walk through your project's file relationships first, then tackle your MVC confusion—this is super common when starting out with Node.js and Express, so don't worry.

File & Folder Relationships #

Let's map out how everything connects, starting from the entry point:

1. index.js: This is your project's main entry file. When you run node index.js, it'll likely import and initialize the Express app from config/custom-express.js.
2. config/custom-express.js: This file is responsible for setting up your Express application. It probably does things like:
   • Configuring the EJS view engine (since you have .ejs files in views)
   • Setting up static file serving for your css/, js/, and other assets
   • Defining routes that link URL paths to controller functions (from the controllers/ folder)
3. controllers/ folder: These files handle the logic for different user requests:
   • home.js: Manages the homepage request (renders index.ejs probably)
   • upload.js: Handles file upload functionality—likely saves uploaded files to folders like files/, Temp/, and redirects to a success page (maybe Succeed/ related views)
   • display.js: Takes care of displaying uploaded files, probably reading from files/ and rendering the appropriate view in views/display/
4. views/ folder: This is your View layer:
   • index.ejs: The main homepage template rendered by home.js
   • css/ & js/: Static frontend assets (styles, client-side scripts) served directly by Express
   • display/: Templates for showing uploaded files, used by display.js
   • Succeed/: Likely a success page template shown after a file upload completes
5. File storage folders: files/, Temp/: These hold uploaded files—Temp/ might be for temporary storage during upload, while files/ is for permanent storage.
6. Other core files:
   • node_modules/: All npm-installed dependencies (like Express, EJS) live here
   • package.json / package-lock.json: Define project dependencies and lock their versions
   • .gitattributes: Git configuration file for handling file attributes in your repo
   • readme.md: Project documentation explaining what the app does and how to run it

Is This Project Using MVC? #

Great question! Let's clarify:

MVC (Model-View-Controller) is an architectural pattern that separates an app into three core layers:

• Model: Handles data logic, interactions with databases, or data storage
• View: Renders the UI for users
• Controller: Mediates between Model and View, handling user requests

Your project has clear View and Controller layers:

• Views: All *.ejs templates and frontend assets in views/
• Controllers: The files in controllers/ that handle request logic

The missing piece is a dedicated Model layer. But that's totally normal for small projects! Here's why:

• Your app seems to focus on file uploads and display, which might only interact with the local filesystem (not a database). Instead of creating a separate Model layer, the file read/write logic is probably directly included in the controller functions (like in upload.js or display.js).
• Many small Node.js apps simplify MVC by skipping a formal Model layer—especially when data operations are straightforward (like working with local files). It doesn't mean the project is "not using MVC principles"; it's just a lightweight adaptation.

If you wanted to add a Model layer later, you could create a models/ folder with files like fileModel.js that handle all file-related operations (saving, reading, deleting), then import that into your controllers to keep logic separated.

内容的提问来源于stack exchange，提问作者Geonhee