Multer: Easily upload files with Node.js and Express

Multer is a Node.js middleware designed to handle multipart/form-data, simplifying the complex process of file uploads in Node.js applications. The article explores Multer's functionality by demonstrating how to build a mini app with a frontend and backend to test file uploads, detailing how it manages user inputs in forms, including text and multiple files, by encoding and uploading forms using the enctype attribute or the FormData API. Multer attaches text inputs to the req.body object and creates req.file or req.files objects for file information, allowing further operations such as posting files to a media management API like Cloudinary. The guide also covers handling single and multiple file uploads, implementing custom file filters, and limiting file sizes, alongside providing a step-by-step implementation of a Node.js server utilizing Express and Multer for processing form inputs and uploads.

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