first you need to install mongodb in your computer and start the service (From command line is like this)
sudo service mongod startservice mongod startto stop it only change start for stop.
Later you have to install the depencies in both folders running the command npm install as in the server folder as in the client folder.
After both installations are done, run first npm run start inside the server directory and generate dummy data throught the /create endpoint, for default it will generate 100 articles, you can change that in Pagination/server/routes/index.js, after that go to the client and run it with npm run server. you should see something like this...
