npm run dev command is not working with the following configurations - node.js

Question

I'm following this tutorials for my first TDD project: https://medium.com/developer-circles-lusaka/how-to-write-an-express-js-server-using-test-driven-development-921dc55aec07
I have install all the required dependency and my package.json file looks like below.
{
"name": "lms_webapi",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"build": "babel src -d dist --source-maps",
"serve": "NODE_ENV=production node dist/index.js",
"start": "NODE_ENV=development babel-node src/index.js",
"dev": "DEBUG=server:debug NODE_ENV=development nodemon src/index.js --exec babel-node",
"test": "DEBUG=server:debug NODE_ENV=test mocha --require babel-core/register --reporter spec --exit tests/ --exec babel-node",
"test:watch": "DEBUG=server:debug NODE_ENV=development mocha --require babel-core/register --watch --reporter spec tests/ --exec babel-node",
"eslint": "eslint src/**/*.js --ignore-pattern \"node_modules/\""
},
"author": "",
"license": "ISC",
"dependencies": {
"babel-cli": "^6.26.0",
"babel-preset-node8": "^1.2.0",
"chai": "^4.2.0",
"config": "^3.3.1",
"debug": "^4.1.1",
"express": "^4.17.1",
"mocha": "^7.1.1",
"mongoose": "^5.9.7",
"supertest": "^4.0.2"
},
"babel": {
"presets": [
"node8"
]
},
"engines": {
"node": ">=8"
},
"eslintConfig": {
"plugins": [
"node"
],
"extends": [
"eslint:recommended",
"plugin:node/recommended"
],
"rules": {
"node/no-unsupported-features/es-syntax": 0,
"node/no-unsupported-features/es-builtins": 0
},
"env": {
"node": true,
"es6": true
},
"parserOptions": {
"sourceType": "module",
"ecmaVersion": 2018
}
}
}
after running the command npm run dev from terminal, I got the following error.
lms_webapi#1.0.0 dev E:\Test\LMS_WebAPI
DEBUG=server:debug NODE_ENV=development nodemon src/index.js --exec babel-node
Der command "DEBUG" is either false or not found.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! lms_webapi#1.0.0 dev: DEBUG=server:debug NODE_ENV=development nodemon src/index.js --exec babel-node
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the lms_webapi#1.0.0 dev script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
Your help will be highly appreciated.
Thank you!

Answer 1

The dev-script fails because it tries to look for the DEBUG command instead of setting the environment variable. This tells us that you're probably on a windows machine. Hence, you need can adjust setting the env-variables as follows:
...
"scripts": {
...
"dev": "set DEBUG=server:debug && set NODE_ENV=development && nodemon src/index.js --exec babel-node",
},
...