Add bindings to Function.Json When Deploying Azure Function

Question

I've come across a lot online saying it's bad practice to edit the Function.Json as a post-build process. The recommendations are setting the App.Settings on the Azure Function but what I want to do it replace the bindings in the Function.Json how do I do that in the app settings? I essentially want the same values in my local.settings.json to override the Function.Json

My local.settings.json

    {
....
  "bindings": [
        {
          "type": "queueTrigger",
          "direction": "in",
          "name": "myQueueItem",
          "queueName": "dev-inbound",
          "connection": "connectionStringV1"
        }
      ]
...
}

Joshua Duxbury · Accepted Answer · 2019-03-12 17:07:55Z

1

Okay so in the app settings I added a new key called "bindings" and simply added fields in as a JSON object. This will override the bindings in the Function.Json file

answered Mar 12, 2019 at 17:07

Joshua Duxbury

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2 Comments

Mikeon Over a year ago

this does not work

Joshua Duxbury Over a year ago

Strange, it worked for me at the time?

Mikeon · Accepted Answer · 2023-03-24 00:08:34Z

0

Correct way to do it is to use %VARIABLE_NAME% in function.json

{
  "scriptFile": "__init__.py",
  "bindings": [
    {
      "name": "msg",
      "type": "serviceBusTrigger",
      "direction": "in",
      "queueName": "%QUEUE_NAME%",
      "connection": "SERVICE_BUS_CONNECTION_STRING"
    }
  ]
}

answered Mar 24, 2023 at 0:08

Mikeon

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Comments

Joshua Duxbury · Accepted Answer · 2023-03-24 09:33:20Z

To use values from the appsettings.json file for your binding configuration, you can use the ${} syntax. For example, if you want to specify the connection string for a storage account, you could set the value in appsettings.json like this:

{
  "AzureWebJobsStorage": "DefaultEndpointsProtocol=https;AccountName=myaccount;AccountKey=mykey;EndpointSuffix=core.windows.net"
}

And in your function.json file, you could use the ${} syntax to reference the connection string like this:

{
  "name": "inputBlob",
  "type": "blob",
  "direction": "in",
  "path": "mycontainer/{name}",
  "connection": "${AzureWebJobsStorage}"
}

This will ensure that the connection string for the storage account is read from the appsettings.json file and used as the connection string for the inputBlob binding.

Note that the ${} syntax can be used to reference any key-value pair in the appsettings.json file, not just connection strings.

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