file upload in node js

Install the multer package using npm: npm install multer

Require multer and create an instance specifying the destination for uploaded files and optionally a filename function to customize the file names.

Create a POST route to handle file uploads using multer middleware.

Access the uploaded file in the route handler using req.file and perform necessary operations such as saving the file or accessing its properties.

Test the file upload functionality using a form with enctype set to "multipart/form-data" and input with type "file".