Learn Multer in Express.js: From Basics to Advanced
By Sharan Panthi
#express#express.js#node.js#multer#file upload#single and multiple files#validate#limit#error handling
Let's learn Multer in Express.js step by step — from basics to advanced usage — with clear examples.
📦 What is Multer?
Multer is a middleware for Express.js used to handle multipart/form-data, which is the format used for file uploads (images, PDFs, videos, etc.).
It lets you:
- Upload single or multiple files
- Store files locally or in memory
- Filter files (e.g., only images)
- Control file names and storage location