Socket.io Shoutbox with MySQL Validation

The purpouse of this demonstration is to allow users to enter messages in either a public or private chat. These messages are then added to a MySQL Database aswell as being sent off to a socket.io server; the server then checks the data being sent against the MySQL Database. A fairly easy way of preventing malicious messages being sent manually.
Deployed Live @ github.io

Dependencies:

[dependencies]
  "cors": "^2.8.5",
  "express": "^4.17.1",
  "mysql": "^2.18.1",
  "querystring": "^0.2.1",
  "socket.io": "^4.1.3"