Azure ARM template deployment. The value for template parameter not provided - json

Question

I am extending one of the Azure quick start template to deploy Azure Web App with VNET integration. The RG, network components and App Service plan are already created (using powershell). I am using the ARM template to deploy the Web App. But I am getting the below error while performing the deployment.
I used JSON Lint, to validate the JSON and looks like it is fine. The error code tells me that there is an issue with the parameter file's syntax, but I am not able to pinpoint it. I tried many things to debug this but not able to fix it.
Error:
PS C:\Users\manjug\Desktop> New-AzResourceGroupDeployment `
-Name 'test01' `
-ResourceGroupName ITQIG-eu-manjug-windows-app `
-TemplateParameterUri C:\Users\manjug\Desktop\azuredeploy_webapp.parameters.json `
-TemplateUri C:\Users\manjug\Desktop\azuredeploy_webapp.json `
-Verbose
VERBOSE: Performing the operation "Creating Deployment" on target "ITQIG-eu-manjug-windows-app".
New-AzResourceGroupDeployment : 2:22:59 PM - Error: Code=InvalidTemplate; Message=Deployment template validation failed: 'The value for the template parameter 'appName' at line '7' and
column '20' is not provided. Please see https://aka.ms/resource-manager-parameter-files for usage details.'.
At line:1 char:1
+ New-AzResourceGroupDeployment `
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [New-AzResourceGroupDeployment], Exception
+ FullyQualifiedErrorId : Microsoft.Azure.Commands.ResourceManager.Cmdlets.Implementation.NewAzureResourceGroupDeploymentCmdlet
New-AzResourceGroupDeployment : The deployment validation failed
At line:1 char:1
+ New-AzResourceGroupDeployment `
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : CloseError: (:) [New-AzResourceGroupDeployment], InvalidOperationException
+ FullyQualifiedErrorId : Microsoft.Azure.Commands.ResourceManager.Cmdlets.Implementation.NewAzureResourceGroupDeploymentCmdlet
azuredeploy_webapp.parameter.json:
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentParameters.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"appName": {
"value": "ITQIG-eu-web-manju123"
},
"kind": {
"value": "app"
},
"location": {
"value": "west europe"
},
"subnetResourceID": {
"value": "/subscriptions/7e7f55d3-4bfd-a6be-1c59594b8592/resourceGroups/ITQIG-eu-network-dev/providers/Microsoft.Network/virtualNetworks/ITQIG-eu-vnet-dev/subnets/subnet7-AWmanjug"
},
"appServicePlanResourceID": {
"value": "/subscriptions/7e7f55d3-4bfd-a6be-1c59594b8592/resourceGroups/ITQIG-eu-manjug-windows-app/providers/microsoft.web/serverFarms/eu-manjug-windows-plan"
}
}
}
azuredeploy_webapp.json
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"appName": {
"type": "string",
"metadata": {
"description": "The name of the app to create."
}
},
"kind": {
"type": "string",
"metadata": {
"description": "Web app kind. OS type -> Windows / Linux."
}
},
"appServicePlanResourceID": {
"metadata": {
"description": "The resource ID of the app service plan."
},
"type": "string"
},
"location": {
"type": "string",
"defaultValue": "[resourceGroup().location]",
"metadata": {
"description": "The location in which all resources should be deployed."
}
},
"subnetResourceID": {
"type": "string",
"metadata": {
"description": "The subnet resource ID created for app service plan which contains this web app."
}
}
},
"resources": [
{
"type": "Microsoft.Web/sites",
"apiVersion": "2019-08-01",
"name": "[parameters('appName')]",
"location": "[parameters('location')]",
"kind": "[parameters('kind')]",
"properties": {
"serverFarmId": "[parameters('appServicePlanResourceID')]"
},
"resources": [
{
"name": "virtualNetwork",
"type": "networkConfig",
"apiVersion": "2019-08-01",
"dependsOn": [
"[resourceId('Microsoft.Web/sites', parameters('appName'))]"
],
"properties": {
"subnetResourceId": "[parameters('subnetResourceId')]",
"swiftSupported": true
}
}
]
}
]
}

Answer 1

I deleted the old file and re-created a new JSON file with the same contents. It is working now. I do not know what caused the issue with the old file though..

Answer 2

It looks like the issue is a result of the powershell cmdlet parameters you were using and not your templates/parameters. Try the following:
Use TemplateParameterFile instead of TemplateParameterUri
Use TemplateFile instead of TemplateUri
Use the file parameters for non uri based arm deployments and this should fix your issue. https://learn.microsoft.com/en-us/powershell/module/az.resources/new-azresourcegroupdeployment?view=azps-4.5.0

Answer 3

Your problem I think is because you are providing dependencies on an existing resource. Remove the "serverFarmId": "[parameters('appServicePlanResourceID')]".
Also another to fix is the hardcoding values of the resourceId you have in parameters file.