nodeRESTapi | A simple REST API server created using NodeJS and Mongoose | REST library

I have a very simple user backend up and running (node, express, mongoose, mongo, etc) and with postman can verify when I add a user it works, when I request a login it works and get a token, and if I put in the wrong details it rejects it,

Now I used this git hub repo https://github.com/christiannwamba/vue-auth-vuex to spin up a simple frontend for this. Which I thought was all working fine as it appeared to be logging in until I found it was accepting whatever details I put in for the email and password as correct!

The backend server kept responding ok when I hit it with the vue app, but on closer inspection when I console logged what it was getting, which was null and returning user not found. So again I don't think there is anything wrong here.

Something I have noticed in chrome dev tools network, it is sending two versions of authenticate, first is empty and then the next one has responses.

I'm at a bit of a loss why it's sending empty requests first time and why it allows the login when it's getting a bad return.

Server.js file: