Multer

Multer is a Node.js middleware for handling `multipart/form-data`, primarily used for file uploads in web applications built with frameworks like Express. It is built on top of `busboy` for efficient streaming and processing of incoming form data. The current stable version is 2.1.1. Multer maintains an active release and security cadence, with multiple patches in recent minor versions (e.g., 2.0.1 through 2.1.1) addressing critical security vulnerabilities (CVEs). Its key differentiators include its robust handling of various file upload scenarios (single, array, multiple fields) and its straightforward API, making it a standard choice for file uploads in the Node.js ecosystem. It explicitly only processes `multipart/form-data` and ignores other content types.