Postgres: Error 28P01 and non-asked user login - node.js

Question

I have an NodeJS app that runs ok in my dev machine, but in production have a wierd behaviour: it asks for a user that I didn't call!
Here is my .env file:
PGUSER=postgres
PGHOST=my.domain
PGPASSWORD=my.passwd
PGDATABASE=my.dbase
PGPORT=5432
As I said, it runs ok in my machine but when I try to run it in my AWS Lighsail VPS it crashes:
/home/ubuntu/apps/bounce/node_modules/pg-protocol/dist/parser.js:287
const message = name === 'notice' ? new messages_1.NoticeMessage(length, messageValue) : new messages_1.DatabaseError(messageValue, length, name);
^
error: password authentication failed for user "ubuntu"
at Parser.parseErrorMessage (/home/ubuntu/apps/bounce/node_modules/pg-protocol/dist/parser.js:287:98)
at Parser.handlePacket (/home/ubuntu/apps/bounce/node_modules/pg-protocol/dist/parser.js:126:29)
at Parser.parse (/home/ubuntu/apps/bounce/node_modules/pg-protocol/dist/parser.js:39:38)
at Socket.<anonymous> (/home/ubuntu/apps/bounce/node_modules/pg-protocol/dist/index.js:11:42)
at Socket.emit (node:events:527:28)
at addChunk (node:internal/streams/readable:315:12)
at readableAddChunk (node:internal/streams/readable:289:9)
at Socket.Readable.push (node:internal/streams/readable:228:10)
at TCP.onStreamRead (node:internal/stream_base_commons:190:23) {
length: 102,
severity: 'FATAL',
code: '28P01',
detail: undefined,
hint: undefined,
position: undefined,
internalPosition: undefined,
internalQuery: undefined,
where: undefined,
schema: undefined,
table: undefined,
column: undefined,
dataType: undefined,
constraint: undefined,
file: 'auth.c',
line: '330',
routine: 'auth_failed'
}
The wierd thing: I didn't called "ubuntu" user in my code - I´m using "postgres", as in my .env file. I tried setting an user/passwd "ubuntu" and tested it , with PgAdmin and BeeKeeper - in booth apps I can access Postgres, but I couldn't do it through my Nodejs app hosted online.
My pg_hba.conf is here:
local all postgres peer
local all ubuntu trust
local all all md5
host all all 0.0.0.0/0 md5
And my connectin file is here:
require('dotenv').config();
const Pool = require('pg').Pool;
const conecta = new Pool({
user: process.env.PGUSER,
password: process.env.PGPASSWORD,
database: process.env.PGDATABASE,
host: process.env.PGHOST,
port: process.env.PGPORT
});
module.exports = conecta;
Why it insists in "ubuntu" user? And why my NodeJS app can't connect if PgAdmin and BeeKeeper can?

Answer 1

Simple answer: use a literal call to the .env file inside config():
require('dotenv').config({ path: '/path/to/your/.env' });