File Upload in Node JS

1. Install Multer: Open your terminal and navigate to your project’s directory. Run the following command to install Multer via npm:

npm install multer, express

2. Set up the Multer middleware: In your Node.js application file (e.g., app.js or index.js), require the necessary dependencies:

const express = require('express');
const multer = require('multer');
const app = express();

const storage = multer.diskStorage({
    destination: function (req, file, cb) {
      cb(null, 'uploads/');
    },
    filename: function (req, file, cb) {
      cb(null, file.originalname);
    }
  });
  
  const upload = multer({ storage: storage });

4. Set up the route: Create an endpoint that will handle the file upload. Use the upload middleware created in the previous step:

app.post('/upload', upload.single('file'), (req, res) => {
    // Handle the uploaded file here
    // `req.file` contains the file details
    res.send('File uploaded successfully.');
  });
  

  

In the example above, we use the upload.single('file') middleware to handle a single file upload. The parameter 'file' should match the name attribute of the file input field in your HTML form.

5. Start the server: Finally, start the server to listen for incoming requests:

app.listen(3000, () => {
    console.log('Server is running on port 3000');
  });
  
  

That’s it! You now have a basic setup for file uploads using Multer in Node.js. Remember to create an uploads/ directory in your project to store the uploaded files.