How to Handle Multipart/Form-Data File Uploads with Multer and Cloudinary

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Developers working with APIs often encounter multipart/form-data, a content type that supports both file and text uploads but can trigger unexpected errors if handled incorrectly. This tutorial demonstrates how to manage image uploads in a JavaScript and ExpressJS project using two key libraries: Multer for server-side file processing and Cloudinary for cloud-based image storage. Multer is configured via its diskStorage method to define upload destinations and file naming conventions, then exported as middleware to be applied directly on the relevant API endpoints. The upload function must be placed immediately after the endpoint definition; misplacing it prevents Multer from processing incoming files. Developers can use Multer's single method for one file at a time or the array method to allow multiple simultaneous uploads.

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