This is my 1st blog post. So, creating a blog on something which I have learned recently.

So we will learn how to upload a file using the popular Node.js middleware, Multer. Multer is a middleware that allows us to handle HTTP requests with enctype "multipart/form-data", which is used for file uploads.

First, we need to install Multer:

npm install multer

Next, we need to import Multer in our Node.js application and set up the storage engine. Multer provides several storage engines like memory storage, disk storage, and cloud storage. Here, we will use the disk storage engine.

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

Now, we need to initialize Multer by passing in the storage engine. We can also set a file filter to restrict the type of files that can be uploaded.

const upload = multer({ storage: storage });

In our route file, we will use the upload.single() middleware to handle the file upload. The single() method is used for uploading a single file. The first argument is the name of the file input field in the HTML form.

router.post('/upload', upload.single('file'), (req, res) => {
  // do something with the file
});

And that's it! Now, we can handle file uploads in our Node.js application using Multer.

If you want to learn furthermore then you can refer, https://www.npmjs.com/package/multer

Please keep in mind that this is a basic example and you should add validation and security checks when you handle file uploads in production.

Some key takeaways from this blog post are:

• Multer is a middleware for handling file uploads in Node.js applications.

• Multer provides several storage engines like memory storage, disk storage, and cloud storage.

• It is easy to set up Multer and handle file uploads in our routes using the upload.single() middleware.

Thank you for reading, I hope this blog post helped understand how to handle file uploads in Node.js with Multer.

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