"index.js not found" when running npm start, ERR! code ELIFECYCLE and ENOENT - node.js

Question

I'm trying to run a Discord bot via Heroku (will this work or is the whole idea flawed?)
However, I receive npm error codes every time I run npm start, and the bot remains offline on Discord.
I have already tried npm cache clean --force,
rmdir /S /Q node_modules and npm install, but none of these worked.
Here are the console logs:
2021-05-09T11:37:13.225562+00:00 heroku[web.1]: Process exited with status 1
2021-05-09T11:37:13.398582+00:00 heroku[web.1]: State changed from starting to crashed
2021-05-09T11:37:20.322275+00:00 app[api]: Starting process with command `npm start` by user <email redacted>
2021-05-09T11:37:23.274907+00:00 heroku[run.4911]: State changed from starting to up
2021-05-09T11:37:23.427148+00:00 heroku[run.4911]: Awaiting client
2021-05-09T11:37:23.726119+00:00 heroku[run.4911]: Starting process with command `npm start`
2021-05-09T11:37:28.678579+00:00 heroku[run.4911]: Process exited with status 1
2021-05-09T11:37:28.742179+00:00 heroku[run.4911]: State changed from up to complete
2021-05-09T11:44:03.004685+00:00 heroku[web.1]: State changed from crashed to starting
2021-05-09T11:44:05.335454+00:00 heroku[web.1]: Starting process with command `npm start`
2021-05-09T11:44:08.088534+00:00 heroku[web.1]: Process exited with status 1
2021-05-09T11:44:08.229000+00:00 heroku[web.1]: State changed from starting to crashed
2021-05-09T11:44:08.232296+00:00 heroku[web.1]: State changed from crashed to starting
2021-05-09T11:44:08.000901+00:00 app[web.1]:
2021-05-09T11:44:08.000925+00:00 app[web.1]: > CalculatorBot#1.0.0 start /app
2021-05-09T11:44:08.000925+00:00 app[web.1]: > index.js
2021-05-09T11:44:08.000925+00:00 app[web.1]:
2021-05-09T11:44:08.005333+00:00 app[web.1]: sh: 1: index.js: not found
2021-05-09T11:44:08.012134+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2021-05-09T11:44:08.012381+00:00 app[web.1]: npm ERR! syscall spawn
2021-05-09T11:44:08.012474+00:00 app[web.1]: npm ERR! file sh
2021-05-09T11:44:08.012618+00:00 app[web.1]: npm ERR! errno ENOENT
2021-05-09T11:44:08.016105+00:00 app[web.1]: npm ERR! CalculatorBot#1.0.0 start: `index.js`
2021-05-09T11:44:08.016163+00:00 app[web.1]: npm ERR! spawn ENOENT
2021-05-09T11:44:08.016238+00:00 app[web.1]: npm ERR!
2021-05-09T11:44:08.016285+00:00 app[web.1]: npm ERR! Failed at the CalculatorBot#1.0.0 start script.
2021-05-09T11:44:08.016364+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2021-05-09T11:44:08.024564+00:00 app[web.1]:
2021-05-09T11:44:08.024647+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2021-05-09T11:44:08.024701+00:00 app[web.1]: npm ERR! /app/.npm/_logs/2021-05-09T11_44_08_016Z-debug.log
2021-05-09T11:44:11.422108+00:00 heroku[web.1]: Starting process with command `npm start`
2021-05-09T11:44:14.301131+00:00 heroku[web.1]: Process exited with status 1
2021-05-09T11:44:14.438297+00:00 heroku[web.1]: State changed from starting to crashed
2021-05-09T11:44:14.212635+00:00 app[web.1]:
2021-05-09T11:44:14.212651+00:00 app[web.1]: > CalculatorBot#1.0.0 start /app
2021-05-09T11:44:14.212652+00:00 app[web.1]: > index.js
2021-05-09T11:44:14.212652+00:00 app[web.1]:
2021-05-09T11:44:14.217415+00:00 app[web.1]: sh: 1: index.js: not found
2021-05-09T11:44:14.225315+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2021-05-09T11:44:14.225593+00:00 app[web.1]: npm ERR! syscall spawn
2021-05-09T11:44:14.225710+00:00 app[web.1]: npm ERR! file sh
2021-05-09T11:44:14.225853+00:00 app[web.1]: npm ERR! errno ENOENT
2021-05-09T11:44:14.229827+00:00 app[web.1]: npm ERR! CalculatorBot#1.0.0 start: `index.js`
2021-05-09T11:44:14.229941+00:00 app[web.1]: npm ERR! spawn ENOENT
2021-05-09T11:44:14.230071+00:00 app[web.1]: npm ERR!
2021-05-09T11:44:14.230234+00:00 app[web.1]: npm ERR! Failed at the CalculatorBot#1.0.0 start script.
2021-05-09T11:44:14.230359+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2021-05-09T11:44:14.237148+00:00 app[web.1]:
2021-05-09T11:44:14.237336+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2021-05-09T11:44:14.237482+00:00 app[web.1]: npm ERR! /app/.npm/_logs/2021-05-09T11_44_14_231Z-debug.log
And my package.json:
{
"name": "CalculatorBot",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"start": "index.js"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"discord.js": "^12.5.3",
"math": "0.0.3"
}
}
Any ideas what I need to do to fix this, or if it is possible to run a Discord bot on Heroku?

Answer 1

change your package.json to the following
......
"start": "node index.js"
.......

Answer 2

Inside your Procfile put this line code same as I had listed here
web: node index.js
Now try again to deploy your WebApp with Heroku.