How to render uploaded photos with NodeJS and Express?
If you just want to render thumbnail versions of your uploaded images for display, try using the imagemagick wrapper node-imagemagick.
For example, you could store your hires-images in a data-folder on your server (lets say /data/images) and render thumbnail images into a web-accessible folder (on upload).
I do not recommend generating the thumbnails on the fly, as it can massively increase your server's load when a large image (especially vector formats like eps or pdf) is being rendered.
For imagemagick examples, consider reading up the docs for the convert command.