How to resolve NPM proxy Issue whilel running Node JS application

I have installed Noed JS and NPM. I have cloned the repo from git and trying to run the app in local. But I am facing below proxy issue while running app.

npm install nodemon
npm ERR! code ENOTFOUND
npm ERR! errno ENOTFOUND
npm ERR! network request to https://registry.npmjs.com/nodemon failed, reason: getaddrinfo ENOTFOUND 28
npm ERR! network This is a problem related to network connectivity.
npm ERR! network In most cases you are behind a proxy or have bad network settings.
npm ERR! network
npm ERR! network If you are behind a proxy, please make sure that the
npm ERR! network 'proxy' config is set properly.  See: 'npm help config'`

I have check with proxy and it is set to below network.

Pinging proxy.internal.domainname.com with 32 bytes of data:
Reply from <ip address="">: bytes=32 time=2ms TTL=247
Reply from <ip address="">: bytes=32 time=2ms TTL=247
Reply from <ip address="">: bytes=32 time=2ms TTL=247
Reply from <ip address="">: bytes=32 time=2ms TTL=247
Ping statistics for <ip address="">:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 2ms, Maximum = 2ms, Average = 2ms

I tried to set proxy to https://registry.npmjs.com/nodemon using below command.

npm config set registry "http://registry.npmjs.org/ 

When I run npm install after this, again I got the same error.

npm --proxy http://registry.npmjs.org/  install npm
npm ERR! code ENOTFOUND
npm ERR! errno ENOTFOUND
npm ERR! network request to http://registry.npmjs.org/npm failed, reason: getaddrinfo ENOTFOUND 28
npm ERR! network This is a problem related to network connectivity.
npm ERR! network In most cases you are behind a proxy or have bad network settings.
npm ERR! network
npm ERR! network If you are behind a proxy, please make sure that the
npm ERR! network 'proxy' config is set properly.  See: 'npm help config'`

I have tried many other workarounds from google but still facing the same proxy issue. I am just looking to run this app in local so that I can test my code in local before deploying. Am I missing something here.

Below is my sample package.json file.

{
  "name": "abc",
  "version": "0.0.1",
  "description": "abc",
  "main": "dist/index.js",
  "engines": {
    "node": "8.0.0",
    "npm": "5.0.0"
  },
  "scripts": {
    "prestart": "npm run -s build",
    "start": "node dist/index.js",
    "dev": "nodemon src/index.js --exec \"node -r dotenv/config -r babel-register\" localdev",
    "clean": "rimraf dist && rimraf -p",
    "build": "npm run clean && mkdir -p dist && babel src -s -D -d dist",
    "test": "jest --watch",
    "lint": "esw -w src test"
  },
  "keywords": [
    "express",
    "babel",
    "es6",
    "es2015",
    "es2016",
    "es2017",
    "eslint"
  ],
  "author": "abc",
  "license": "LICENSED",
  "dependencies": {
    "babel-cli": "6.26.0",
    "babel-plugin-transform-object-rest-spread": "6.26.0",
    "babel-preset-env": "1.6.1",
    "cors": "2.8.5",
    "express": "4.16.4",
    "js-yaml": "3.12.2",
    "mssql": "5.0.0",
    "winston": "3.1.0",
    "winston-daily-rotate-file": "3.5.1"
  },
  "devDependencies": {
    "babel-eslint": "7.2.3",
    "babel-jest": "21.0.2",
    "babel-register": "6.24.1",
    "dotenv": "4.0.0",
    "eslint": "4.10.0",
    "eslint-config-airbnb-base": "12.1.0",
    "eslint-plugin-import": "2.8.0",
    "eslint-plugin-jest": "21.0.2",
    "eslint-watch": "3.1.0",
    "nodemon": "1.18.10",
    "rimraf": "2.6.3"
  },
  "babel": {
    "presets": [
      [
        "env",
        {
          "targets": {
            "node": "current"
          }
        }
      ]
    ],
    "plugins": [
      "transform-object-rest-spread"
    ]
  },
  "eslintConfig": {
    "parser": "babel-eslint",
    "plugins": [
      "import",
      "jest"
    ],
    "parserOptions": {
      "ecmaVersion": 2017,
      "sourceType": "module"
    },
    "env": {
      "node": true,
      "jest": true
    },
    "extends": [
      "eslint:recommended"
    ]
  }
}

Edit:

Running the npm config ls command returns the following result:

; cli configs
metrics-registry = "http://registry.npmjs.org/async-each"
scope = ""
user-agent = "npm/6.13.4 node/v12.14.0 win32 x64"

; userconfig C:\Users\username\.npmrc
https-proxy = "http://registry.npmjs.org/"
https://registry.npmjs.com/nodemon = ""
key = ""
registry = "http://registry.npmjs.org/"
strict-ssl = false

; builtin config undefined
prefix = "C:\\Users\\username\\AppData\\Roaming\\npm"

; node bin location = C:\Program Files\nodejs\node.exe
; cwd = H:\IRB PMX Services\core\src
; HOME = C:\Users\username
; "npm config ls -l" to show all defaults.

Edit 2:

I have now run the following command to delete the erroneous configuration key, i.e. the https://registry.npmjs.com/nodemon = "" part:

npm config delete https://registry.npmjs.com/nodemon

and again ran the npm install command. But again got the proxy error as below:

npm ERR! network request to registry.npmjs.org/async-each/@types%2fnode failed, reason: read ECONNRESET
npm ERR! network This is a problem related to network connectivity.
npm ERR! network In most cases you are behind a proxy or have bad network settings.
npm ERR! network npm ERR! network If you are behind a proxy, please make sure that the
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