FCC - Exercise tracker - trouble with packages, POST, etc

I should close the loop on this, seeing as I asked a more pointed question about the same exercise here. I ended up starting from scratch, but the issue in the last one is I was confusing the password to my DB with the password to accessing MongoDB. Also (it was a few weeks ago), I was googling through a few errors I was receiving, and I believe I ended up going into the terminal and re-installing a few of the npm packages, and last, I think I was having a few packages that were incomptible versions behind other ones. A bunch of small things adding up to a DB that wouldn’t connect.