Issue in connecting to heroku postgres from node + express + also locally

• New to Node here, trying for the last 3 days straight, no clue.
• Read all similar issues and tried literally everything I could find, no luck.
• Suspecting something that is not common or related to my machine or code.

• Issue: trying to fetch data in node.js from postgres db - to console (at least) so to render it later as HTML

• Database has table name: students on heroku, and has records

• Also locally on my macOS, I have postgres installed with simple data in a table called students

• I couldn't fetch any data, no error, no idea how to track it!

• Tried creating connection with pool, client.. also used heroku guide here exactly

• Literally everything that other users mostly encountered

• DATABASE_URL environment variable is ok, if i echo $DATABASE_URL in Terminal:

postgres://xnlkikdztxosk:kuadf76d555dfab0a6c159b8404e2ac254f581639c09079baae4752a7b64a@ec3-52-120-48-116.compute-1.amazonaws.com:5432/uytnmb7fvbg1764

• When i run 'node app.js' server starts ok on port 3000, I can use postman on the root '/' OK and it works, it returns back the json info and console.log
• If i try postman to '/students' then it tries forever, no results, no error, nothing
• Tried also with my local installation of postgres, same thing
• My modules are ok, and I run npm install several times
• Thought could be my mac firewall, i turned it off completely
• Also tried this, nothing prints out or no idea where to track it:

process.on('uncaughtException', function (err) {
  console.log(err);
}); 

• Guide or steps to follow in order to track issues like this will be highly appreciated

  app.js file:
  
    const express = require('express')
    const bodyParser = require('body-parser')
    const { Client } = require('pg');
  
    const app = express()
    const PORT = 3000
  
    app.use(bodyParser.json())
    app.use(
      bodyParser.urlencoded({
        extended: true,
      })
    )
  
    const client = new Client({
      connectionString: process.env.DATABASE_URL,
      ssl: {
        rejectUnauthorized: false
      }
    });
    client.connect();
  
    app.get('/', (req, res) => {
      res.json({ info: 'Info: This is the root directory' });
      console.log('main directory')
    })
  
    app.get('/students', (req, res) => {
  
      client.query('SELECT * FROM students;', (err, res) => {
        if (err) throw err;
        for (let row of res.rows) {
          console.log(JSON.stringify(row));
          console.log('WHOOOOOO, finally!');
        }
        client.end();
      });
    });
  
    app.listen(PORT, function(){ 
      console.log('Server running on port 3000');
    });