Error during uploading mern stack project into heroku - node.js

Question

In Procfile:
web: node Backend/server.js
In package.json of backend, I am using post build for react app. its saying cannot find module /app/backend/server.js.
{
"name": "ecommerce",
"version": "1.0.0",
"description": "",
"main": "Backend/server.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"start": "node backend/server.js",
"dev": "nodemon backend/server.js",
"heroku-postbuild": "NPM_CONFIG_PRODUCTION=false && npm install --prefix frontend && npm run build --prefix frontend"
},
"author": "",
"license": "ISC",
"dependencies": {
"bcryptjs": "^2.4.3",
"body-parser": "^1.19.0",
"cloudinary": "^1.28.1",
"cookie-parser": "^1.4.5",
"dotenv": "^10.0.0",
"express": "^4.17.1",
"express-fileupload": "^1.2.1",
"jsonwebtoken": "^8.5.1",
"mongoose": "^6.0.10",
"nodemailer": "^6.7.0",
"nodemon": "^2.0.13",
"stripe": "^8.197.0",
"validator": "^13.6.0"
}
}
My project is laid out like this:
Backend/
frontend/
Procfile
package-lock.json
package.json

Answer 1

Your start script tries to run node backend/server.js, but your file is actually at Backend/server.js. Heroku's filesystem is case-sensitive. You can use either option, but you must be consistent.
Here is one solution. Rename your directory:
git mv Backend backend
And update your Procfile:
web: node backend/server.js
Then commit and redeploy.