Creating a VM using ARM

vm.json

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "environmentName": {
      "type": "string",
      "allowedValues": [
        "prod",
        "dev"
      ]
    },
    "storageAccountName": {
      "type": "string",
      "minLength": 3,
      "maxLength": 24
    },
    "vmOS": {
      "type": "string",
      "defaultValue": "2019-Datacenter",
      "allowedValues": [
        "2016-Datacenter",
        "2016-Datacenter-Server-Core",
        "2016-Datacenter-Server-Core-smalldisk",
        "2019-Datacenter",
        "2019-Datacenter-Server-Core",
        "2019-Datacenter-Server-Core-smalldisk"
      ]
    },
    "vmAdminPassword": {
      "type": "secureString",
      "metadata": {
        "description": "password for the windows VM"
      }
    },
    "vmPrefix": {
      "type": "string",
      "minLength": 1,
      "maxLength": 9
    },
    "vnetName": {
      "type": "string",
      "metadata": {
        "description": "name of the Virtual network"
      }
    }
  },
  "functions": [],
  "variables": {
    "defaultLocation": "[resourceGroup().location]",
    "sku": "[if(equals(parameters('environmentName'), 'prod'), 'Standard_GRS', 'Standard_LRS')]",
    "vmName": "[format('{0}-{1}', parameters('vmPrefix'), parameters('environmentName'))]",
    "vmNicName": "[format('{0}-nic', variables('vmName'))]",
    "vnetConfig": {
      "vnetprefix": "10.0.0.0/21",
      "subnet": {
        "name": "front",
        "addressPrefix": "10.0.0.0/24"
      }
    }
  },
  "resources": [
    {
      "type": "Microsoft.Storage/storageAccounts",
      "apiVersion": "2020-08-01-preview",
      "name": "[parameters('storageAccountName')]",
      "location": "[variables('defaultLocation')]",
      "sku": {
        "name": "[variables('sku')]"
      },
      "kind": "Storage"
    },
    {
      "type": "Microsoft.Network/networkInterfaces",
      "apiVersion": "2017-06-01",
      "name": "[variables('vmNicName')]",
      "location": "[variables('defaultLocation')]",
      "properties": {
        "ipConfigurations": [
          {
            "name": "ipconfig1",
            "properties": {
              "subnet": {
                "id": "[format('{0}/subnets/front', resourceId('Microsoft.Network/virtualNetworks', parameters('vnetName')))]"
              },
              "privateIPAllocationMethod": "Dynamic"
            }
          }
        ]
      },
      "dependsOn": [
        "[resourceId('Microsoft.Network/virtualNetworks', parameters('vnetName'))]"
      ]
    },
    {
      "type": "Microsoft.Compute/disks",
      "apiVersion": "2019-07-01",
      "name": "[format('{0}-vhd', variables('vmName'))]",
      "location": "[variables('defaultLocation')]",
      "sku": {
        "name": "Premium_LRS"
      },
      "properties": {
        "diskSizeGB": 32,
        "creationData": {
          "createOption": "Empty"
        }
      }
    },
    {
      "type": "Microsoft.Compute/virtualMachines",
      "apiVersion": "2019-07-01",
      "name": "[variables('vmName')]",
      "location": "[variables('defaultLocation')]",
      "properties": {
        "osProfile": {
          "computerName": "[variables('vmName')]",
          "adminUsername": "localadm",
          "adminPassword": "[parameters('vmAdminPassword')]",
          "windowsConfiguration": {
            "provisionVMAgent": true
          }
        },
        "hardwareProfile": {
          "vmSize": "Standard_A0"
        },
        "storageProfile": {
          "imageReference": {
            "publisher": "MicrosoftWindowsServer",
            "offer": "WindowsServer",
            "sku": "[parameters('vmOS')]",
            "version": "latest"
          },
          "osDisk": {
            "createOption": "FromImage"
          },
          "dataDisks": [
            {
              "name": "[format('{0}-vhd', variables('vmName'))]",
              "createOption": "Attach",
              "caching": "ReadOnly",
              "lun": 0,
              "managedDisk": {
                "id": "[resourceId('Microsoft.Compute/disks', format('{0}-vhd', variables('vmName')))]"
              }
            }
          ]
        },
        "networkProfile": {
          "networkInterfaces": [
            {
              "properties": {
                "primary": true
              },
              "id": "[resourceId('Microsoft.Network/networkInterfaces', variables('vmNicName'))]"
            }
          ]
        },
        "diagnosticsProfile": {
          "bootDiagnostics": {
            "enabled": true,
            "storageUri": "[reference(resourceId('Microsoft.Storage/storageAccounts', parameters('storageAccountName'))).primaryEndpoints.blob]"
          }
        }
      },
      "dependsOn": [
        "[resourceId('Microsoft.Storage/storageAccounts', parameters('storageAccountName'))]",
        "[resourceId('Microsoft.Compute/disks', format('{0}-vhd', variables('vmName')))]",
        "[resourceId('Microsoft.Network/networkInterfaces', variables('vmNicName'))]"
      ]
    },
    {
      "type": "Microsoft.Network/virtualNetworks",
      "apiVersion": "2020-05-01",
      "name": "[parameters('vnetName')]",
      "location": "[variables('defaultLocation')]",
      "properties": {
        "addressSpace": {
          "addressPrefixes": [
            "[variables('vnetConfig').vnetprefix]"
          ]
        },
        "subnets": [
          {
            "name": "[variables('vnetConfig').subnet.name]",
            "properties": {
              "addressPrefix": "[variables('vnetConfig').subnet.addressPrefix]"
            }
          }
        ]
      }
    }
  ]
}