@GarrettBryan the domain is correctly routed. The only problem is at login/registration. And I tried with the domain only too. I wonder if is not a problem with the server time @PitaJ Initially I login on localhost, which works correctly. Then on Heroku could fail because the server is on a different time zone?

It looks like is a configuration problem. When I load the page, there is this network error: socket.io.js:8 WebSocket connection to 'wss://example.com/socket.io/?EIO=3&transport=websocket&sid=zV8kYkx-87ULGIjGAAAF' failed: Error in connection establishment: net::ERR_SSL_PROTOCOL_ERROR On Chrome's inspector window it says it was canceled. But then it works normal. So all I need is to bypass the first error... or even better, fix it.

@PitaJ and who else may encounter this issue, here is how I solved it. The root problem was the image format used for "Site Logo" in general/settings. I've uploaded a png file and the information was not saved in the database, althoughthe fields remained filled across the sessions. Once I've changed the site logo with a jpg file, the emails were properly formatted too.

What the title says: which would be the simplest plugin to start learning from? What I'm trying to accomplish is to create a MongoDB collection where to store some information, then execute all CRUD operations. LE: this should've been posted in plugins category.

I'm using NodeBB as an interface for an app, more like a crowdsourcing hub. The forum is okay, but sometimes the communication is more dynamic and people have to either speak on the phone, use other apps or meet in person. For new forums or for forums with small user base, a cross-forum chat room would be very engaging. For the UI I'm imagining something like DC++ looked like in the old days. This idea fits in different scenarios. At least in mine it does. The chat room would be an extension of the forum. How do you find the idea?

@baris nevermind, I am new to NodeBB and I was trying to set the max length through an inappropriate method.

For who else might be interested on adding custom registration fiedls, I found a plugin which seems to be this: https://github.com/btw6391/nodebb-plugin-custom-registration-fields

@PitaJ thanks. I need to install it on Heroku and it doesn't have nginx now. I know I have a long road ahead, but I think I found the direction.