Formidable is the most popular file uploading library for Express. Here's how you can use Formidable to upload files:

The /upload route handler has 3 steps:

Create a new form using new formidable.IncomingForm() . The IncomingForm class is the primary entry point to Formidable.

Call form.parse() on an Express request. This tells Formidable to parse the request and save any files in the request to your server.