Express not fetching data from postgres database. No errors displayed

This is a difficult question for me to ask because I'm not truly sure what the issue is.

I have an Express JS server for routing and Node Postgres (PG) for the pool.

When I either go directly to localhost or use POSTMAN to test the routes there is no response except a simple loading screen. With POSTMAN, it gets stuck like so:

POSTMAN sending request...

Or for localhost it simply stays buffering/loading.

I am following this video on how to deploy a PERN app to Heroku. However, even after cloning the repo and updating all the packages within I cannot fetch data from my database (I am using PostgreSQL). I have updated all the database login information so it's not that.

Below is my code:

Server:

const express = require("express");
const app = express();
const cors = require("cors");
const pool = require("./db");

app.use(cors());
app.use(express.json());

app.get("/todos", async (req, res) => {
  try {
    const allTodos = await pool.query("SELECT * FROM todo");
  } catch (err) {
    console.error(err.message);
  }
});

app.get("*", (req, res) => {
  res.send("TEST");
});

app.listen(5000, () => {
  console.log("server has started on port 5000");
});

Pool

const Pool = require("pg").Pool;

const pool = new Pool({
  user: "postgres",
  password: "postgres",
  host: "localhost",
  port: 5432,
  database: "perntodo"
});

module.exports = pool;

All pool information is correct.

I have checked my database and there are active tables and data.

Again, there are no errors displayed so it's super hard for me to diagnose the problem.