How to limit the possible types of accepted files in node.js?

Question

Node.js

Hello. I am using node.js with express.js framework.
I would like to know how you can limit the type of files transferred to the server via multipart/form-data?
That is, I need the available formats to be, for example, only jpg, png, mp3, mp4.
And when transferring a file of a different type to the server, an error will be generated? Can the restriction be done at the nginx level, or on the web server itself?