Express Server not able to bind to any port. app.Listen() is returning `Uncaught Exception` for all ports I am trying

I was trying to setup my Ubuntu 20.04 to run my expressJS server but this error is not letting me do that. So here is the whole problem:

1. I am using bun instead of node for this project. My package.json is:

{
  "name": "server",
  "module": "index.ts",
  "type": "module",
  "devDependencies": {
    "@types/bcrypt": "^5.0.2",
    "@types/bun": "latest",
    "@types/cors": "^2.8.17",
    "@types/express": "^5.0.0",
    "@types/jsonwebtoken": "^9.0.7",
    "@types/multer": "^1.4.12"
  },
  "scripts": {
    "dev": "bun --watch src/index.ts",
    "build": "tsc"
  },
  "peerDependencies": {
    "typescript": "^5.6.3"
  },
  "dependencies": {
    "@types/dotenv": "^8.2.3",
    "@types/express-rate-limit": "^6.0.2",
    "@types/pg": "^8.11.10",
    "axios": "^1.7.9",
    "bcrypt": "^5.1.1",
    "cloudinary": "^2.5.1",
    "cookie-parser": "^1.4.7",
    "cors": "^2.8.5",
    "csv-parser": "^3.1.0",
    "dotenv": "^16.4.7",
    "express": "^4.21.2",
    "express-rate-limit": "^7.5.0",
    "helmet": "^8.0.0",
    "jsonwebtoken": "^9.0.2",
    "mongoose": "^8.9.3",
    "multer": "^1.4.5-lts.1",
    "ngrok": "^5.0.0-beta.2",
    "pg": "^8.13.1"
  }
}

When I am running the command: bun run dev. I am getting the output as:

I know that the first step to debug this is to check the port if someone using it or not. Here are the outputs for that:

i.e. No one is using this port.

There are also no zombie processes using this port.

And even if I change this port. This same error persists.

• I have tried deleting and then reinstalling node_modules.
• rebooting system
• clearing up bun's cache.
• My firewall is also inactive.

But nothing above is working as of now.

• PS: I developed this project using my Fedora machine. And it works fine in that.
• Here is the repo link, if you want to check the code: My_Code

If you don't have IPv6 configured or no default route for it, and your /etc/hosts contains an entry aliasing ::1 to localhost, this Bun issue suggests that you'll get EADDRINUSE and recommends trying to bind to 127.0.0.1 to explicitly bind to the IPv4 localhost address, or removing the line ::1 localhost from /etc/hosts (requires sudo).