Webserver keeps returning 502

Question

I've been trying to start a webserver for a couple hours now but it keeps returning a 502 error. need help with this.  here is my test code:

```js
const express = require("express");
const app = express();

const PORT = process.env.PORT || 8080;

app.get("/", (req, res) => {
  res.send("Server is running!");
});

app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});
```
and my start cmd is `node src/index.js` i dont get any build/ deployment errors .