CONSOLE OUTPUT
==============
[nodemon] starting `node app.js`
HTTP Server for NodeApp started at port 3000
We're in to the back end of NodeApp !
Someone has POSTed data to the Node server ...
URL trimmed endpoint: reg-user
Input Value: tamjk
In router.js now ...
Endpoint: reg-user Data: tamjk
Handler: authen.js
In handler authen.js now ...
Mode: reg Field: user Value: tamjk
In format validation now ...
Format Validation Message: Valid format
Connecting to user-data database checking user ...
In MySQL Query script now ...
Query: SELECT user FROM users WHERE user = 'tamjk'
Router returned message undefined
Callback Message: undefined
Message: undefined
Sent back response: undefined
_http_outgoing.js:696
throw new ERR_INVALID_ARG_TYPE('first argument',
^
TypeError [ERR_INVALID_ARG_TYPE]: The first argument must be of type string or an instance of Buffer or Uint8Array. Received undefined
at write_ (_http_outgoing.js:696:11)
at ServerResponse.write (_http_outgoing.js:661:15)
at reqCallback (/home/sandbar/Desktop/nodeapp-local/app.js:116:6)
at IncomingMessage.<anonymous> (/home/sandbar/Desktop/nodeapp-local/app.js:87:10)
at IncomingMessage.emit (events.js:327:22)
at endReadableNT (_stream_readable.js:1327:12)
at processTicksAndRejections (internal/process/task_queues.js:80:21) {
code: 'ERR_INVALID_ARG_TYPE'
}
[nodemon] app crashed - waiting for file changes before starting...