Install first the dependencies of my client and server folder.
Client - is the base directory.
Server - is the server folder in directory.
cd to server directory, run 'npm run dev' to the terminal.
this will run both the server and the client using concurrently.
Also make sure to make a '.env' file to the server and put your JWT_TOKEN && MONGODB_CONNECTION_STRING.
you can go here https://jwt.io to generate you own jwt. and create an account for MongoDB to get your own connection.
JWT_TOKEN=youjwttoken.
MONGODB_CONNECTION_STRING=yourownconnectionstring.
After you done these things, starting 'npm run dev' in server directory will make the app run smoothly.
Enjoy, Happy Coding!.