I followed a YouTube tutorial and created a full stack (MERN) social media application. I am having issues deploying it. I have tried every solution I could find related to heroku[router]  code=H10, but none of them solved my issues. Here are my files related.
package.json
{
  "name": "server",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "type": "module",
  "scripts": {
    "start": "node index.js"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "bcrypt": "^5.0.1",
    "body-parser": "^1.20.0",
    "cors": "^2.8.5",
    "dotenv": "^16.0.1",
    "express": "^4.18.1",
    "jsonwebtoken": "^8.5.1",
    "mongoose": "^6.5.1",
    "multer": "^1.4.5-lts.1",
    "nodemon": "^2.0.19"
  }
}
index.js
import express from "express";
import bodyParser from "body-parser";
import mongoose from "mongoose";
import dotenv from "dotenv";
import cors from "cors";
import AuthRoute from "./Routes/AuthRoute.js";
import UserRoute from "./Routes/UserRoute.js";
import PostRoute from "./Routes/PostRoute.js";
import UploadRoute from "./Routes/UploadRoute.js";
// Routes
const app = express();
//Public images
app.use(express.static('public'))
app.use('/images', express.static('images'))
// Middleware
app.use(bodyParser.json({ limit: "30mb", extended: true }));
app.use(bodyParser.urlencoded({ limit: "30mb", extended: true }));
app.use(cors());
dotenv.config();
mongoose
  .connect(process.env.MONGO_URI, {
    useNewUrlParser: true,
    useUnifiedTopology: true,
  })
  .then(() =>
    app.listen(process.env.PORT, () =>
      console.log("Connected")
    )
  )
  .catch((error) => console.log(error));
// Usage of routes
app.use("/auth", AuthRoute);
app.use("/user", UserRoute);
app.use("/posts", PostRoute);
app.use('/upload', UploadRoute);
I have also edited the config variables and have
MONGO_URI linked to my MongoDB.
I originally had my start script as nodemon index.js. I changed it to direct node to start at index.js. Perhaps that is part of the issue. I changed it to just run node instead of nodemon.
What am I doing wrong?
 
    