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Comments in arm templates makes the template invalid

See original GitHub issue

Copied from @sjkp closed issue 2112. (RIP Neil Peart).

I’ll add that Visual Studio Code supports comments in JSON.

If an ARM template contains comments (//) with containing / the template deployment will fail.

I have a ARM template that looks like this:

{
    "$schema": "http://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "sitename": {
            "type": "string"
        },
        "hostingPlanName": {
            "type": "string"
        },
        "siteLocation": {
            "type": "string"
        },
        "sku": {
            "type": "string",
            "defaultValue": "f1",
            "metadata": {
                "description": "The hosting plan sku"
            }
        },
        "tier": {
            "type": "string",
            "defaultValue": "Free",
            "allowedValues": [
                "Free",
                "Shared",
                "Basic",
                "Standard",
                "Premium"
            ],
            "metadata": {
                "description": "the pricing tier"
            }
        }
    },
    "resources": [
        {
            "apiVersion": "2015-08-01",
            "location": "[parameters('siteLocation')]",
            "name": "[parameters('hostingPlanName')]",
            "type": "Microsoft.Web/serverfarms",
            "properties": {
                "name": "[parameters('hostingPlanName')]",
                "numberOfWorkers": 1
            },
            "sku": {
                "name": "[parameters('sku')]",
                "tier": "[parameters('tier')]"
            }           
        },
//Comments Microsoft.Web/serverfarms --
        {
            "apiVersion": "2015-08-01",
            "location": "[parameters('siteLocation')]",
            "name": "[parameters('sitename')]",
            "type": "Microsoft.Web/sites",
            "dependsOn": [ "[concat('Microsoft.Web/serverFarms/', parameters('hostingPlanName'))]" ],
            "properties": {
                "name": "[parameters('sitename')]",
                "serverFarmId": "[parameters('hostingPlanName')]"
            }
        }
    ]
}

When i try to deploy it with: azure group create -n website -l westeurope -f website.json -e website.param.dev.json -d website

I get the following error info: Executing command group create

Getting resource group sjkpwebsite Updating resource group sjkpwebsite info: Updated resource group sjkpwebsite Initializing template configurations and parameters error: Unexpected token /