Can't run node express on centos server - node.js

Question

I am trying to run an express app that I installed using express --view pug urltracker. I also executed npm install to install all dependencies.
When I start it on my laptop localhost using DEBUG=urltracker:* && npm start
it perfectly starts on localhost:3000 and my app runs smoothly but when I install it on centos 7 server, the same gets stuck at [nodemon] starting `node ./bin/www and nothing happens afterwards.
I tried running it like this as well DEBUG=backend ./bin/www but it says -bash: ./bin/www: Permission denied OR sudo: ./bin/www: command not found
I can execute a normal file like node app.js and it works fine but when it comes to running it as server, it doesn't work.
Here's my package.json
{
"name": "urltracker",
"version": "0.0.0",
"private": true,
"scripts": {
"start": "nodemon ./bin/www"
},
"dependencies": {
"body-parser": "~1.18.2",
"cookie-parser": "~1.4.3",
"debug": "~2.6.9",
"express": "~4.15.5",
"morgan": "~1.9.0",
"pug": "2.0.0-beta11",
"serve-favicon": "~2.4.5",
"puppeteer": "^1.6.2",
"puppeteer-select": "^1.0.3"
},
"devDependencies": {
"eslint-plugin-mocha": "^4.11.0",
"file-system": "^2.2.2",
"jest": "^21.2.1",
"js-comments": "^0.5.4",
"lodash": "^4.17.13"
}
}
I also tried it with running node supervisor using supervisor ./bin/www
but it says
Starting child process with 'node ./bin/www'
Watching directory '/home/admin/web/example.com/node/projects' for changes.
Press rs for restarting the process.
I also tried changing the port to 3001 in ./bin/www like this - server.listen('3001', '0.0.0.0');
but nothing works. Help.

Answer 1

Nodemon is not listed in your dependencies list in package.json and on the centos server nodemon is not present.
Please add the nodemon dependency in the package.json and then run npm i
or change the start script from "start": "nodemon ./bin/www" to "start": "node ./bin/www"