Create file ".env" into "node-js-jwt-auth-mongo" folder. Input

PORT=8080
NODE_ENV=test
SECRET=NULL
EMAIL_NAME=NULL@gmail.com
EMAIL_PASSWORD=NULL

Change EMAIL_NAME and EMAIL_PASSWORD to your own mail. (only @gmail.com)

Create file ".env" into "vue-vuex-jwt-auth" folder. Input

VUE_APP_PORT=8081

Open first terminal and run command

cd node-js-jwt-auth-mongo; npm i; npm start

Open second terminal and run command

cd vue-vuex-jwt-auth; npm i; npm run serve

Then open node-js-jwt-auth-mongo/server.js and comment on lines from 41 to 56 and save file (Ctrl+S).