The process.env not defined after deploying to ubuntu 18.04 - node.js

Question

I deployed my nodejs 10.16.3 app to ubuntu 18.04 from my win10 PC development. The problem is that the process.env becomes undefined on ubuntu server. The dotenv module is used as:
require('dotenv').config({path: process.cwd() +'/config/.env'});
The server is listening to:
const port = process.env.PORT; // 3000;
console.log(process.env);
server.listen(port, () => {
console.log(`env var: ${process.env.jwtPrivateKey}`)
console.log(`Listening on port ${port}...`);
});
There is a .env file under myproj\config\ storing all the user defined params. Her is a portion of the file:
PORT = 3000
DB_PASSWORD = mydbpassword
jwtPrivateKey = myprivatekey
jwt_token_expire_days = 24
jwt_secret_len = 10
vcode_time_elapse = 10
After starting the nodejs app with :
pm2 start /ebs/www/myapp/index.js
Here is printout from index-out.log:
$cat index-out.log
env var: undefined
Listening on port undefined...
Here is the index-error.log:
$ cat index-error.log
Unable to connect to the database: { SequelizeConnectionRefusedError: connect ECONNREFUSED 127.0.0.1:5433
at connection.connect.err (/ebs/www/emps/node_modules/sequelize/lib/dialects/postgres/connection-manager.js:170:24)
at Connection.connectingErrorHandler (/ebs/www/emps/node_modules/pg/lib/client.js:174:14)
at Connection.emit (events.js:198:13)
at Socket.reportStreamError (/ebs/www/emps/node_modules/pg/lib/connection.js:72:10)
at Socket.emit (events.js:198:13)
at emitErrorNT (internal/streams/destroy.js:91:8)
at emitErrorAndCloseNT (internal/streams/destroy.js:59:3)
at process._tickCallback (internal/process/next_tick.js:63:19)
name: 'SequelizeConnectionRefusedError',
parent:
{ Error: connect ECONNREFUSED 127.0.0.1:5433
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1106:14)
errno: 'ECONNREFUSED',
code: 'ECONNREFUSED',
syscall: 'connect',
address: '127.0.0.1',
port: 5433 },
original:
{ Error: connect ECONNREFUSED 127.0.0.1:5433
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1106:14)
errno: 'ECONNREFUSED',
code: 'ECONNREFUSED',
syscall: 'connect',
address: '127.0.0.1',
port: 5433 } }
It must be something related to configuration of dotenv module.

Answer 1

Change your require dotenv statement from
require('dotenv').config({path: process.cwd() +'/config/.env'});
to
require('dotenv').config({path: __dirname +'/config/.env'});
Since the project is started from different location using below command, it is not able to read the .env file:
pm2 start /ebs/www/myapp/index.js
Difference between process.cwd() and __dirname :
process.cwd() returns the current working directory, the directory from which you invoked the node command.
__dirname returns the directory name of the directory containing the JavaScript source code file