File uploads using Node.js

File uploads in Node.js can be handled using several libraries. One popular choice is express for building web applications and multer for handling file uploads. Below is a simple example demonstrating how to set up file uploads using Node.js, Express, and Multer.

First, install the necessary packages:

        
            npm install express multer
        
    

Now, create a basic server with file upload functionality:

        
            const express = require('express');
            const multer = require('multer');
            const path = require('path');
            
            const app = express();
            const port = 3000;
            
            // Set up multer for handling file uploads
            const storage = multer.diskStorage({
              destination: function (req, file, cb) {
                cb(null, 'uploads/'); // Uploads will be stored in the 'uploads' directory
              },
              filename: function (req, file, cb) {
                cb(null, file.fieldname + '-' + Date.now() + path.extname(file.originalname));
              },
            });
            
            const upload = multer({ storage: storage });
            
            // Serve HTML form for file upload
            app.get('/', (req, res) => {
              res.sendFile(path.join(__dirname, 'index.html'));
            });
            
            // Handle file upload
            app.post('/upload', upload.single('file'), (req, res) => {
              if (!req.file) {
                return res.status(400).send('No file uploaded.');
              }
            
              res.send('File uploaded successfully.');
            });
            
            // Start the server
            app.listen(port, () => {
              console.log(`Server is running at http://localhost:${port}`);
            });            
        
    

Create an index.html file in the same directory as your server script with the following content:

In this example:

• The express framework is used to create a simple web server.
• multer is used to handle file uploads. The configuration specifies that uploaded files should be stored in the uploads directory and have a unique filename.
• The server provides an HTML form for file uploads at the root ("/") and handles file uploads at the "/upload" endpoint.
• The server listens on port 3000.

Run your Node.js script, navigate to http://localhost:3000 in your browser, and you should see the file upload form. After selecting a file and clicking "Upload," the file will be uploaded to the "uploads" directory. Adjust the code according to your specific requirements and directory structure.

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