Reference Logic App parameter name

Question

I would like to get the reference to the parameter name, as well as its value, within a Logic App. So, given:

    "parameters": {
            "$connections": {
                "defaultValue": {},
                "type": "Object"
            },
            "username": {
                "defaultValue": "ABCDE",
                "type": "String"
            }
        },

I would like to be able to do something like @{concat(parameters('username')['name'],'=',parameters('username'))} to get a string like "username=ABCDE".

Perhaps this is easy with the right syntax? Apologies but didn't see this in the docs.

Answer 1

Hello @Noah Van Loen , I have the following flow in my logic app, which I used to get the desired output.
I used a HTTP request trigger, with the schema provided above as "Request Body JSON Schema"

I then used the "Parse JSON" action, with the request body above as the content. ( You can choose any Dynamic content as shown below, just make sure to upload the appropriate schema.)

As as a response body, I used the "concat" function for the Parsed JSON above. You can select the "concat" expression from "Expression tab" and then from the "Dynamic Content" you can select the objects from the Parsed JSON.

The concat expression I achieved based on JSON payload generated by the schema provided is @concat('username','=', body('Parse_JSON')?['parameters']?['username']?['defaultValue']).
Please let me know if there are any additional concerns, I will be glad to continue with our discussion.

Answer 2

Hello @Noah Van Loen , You can use Parse JSON action to concat the required fields. The expression obtained should be similar as below

"@markus.bohland@hotmail.de (body('Parse_JSON')?['username']?['name'],'=',body('Parse_JSON')?['username'])",

Please let me know if this does not resolve your issue, I will be happy to continue with our discussion.

Answer 3

Thanks @ChaitanyaNaykodi-MSFT . What is the syntax to use Parse_JSON to parse the parameter list? Schema=

    {  
      "type": "object",  
      "properties": {  
        "parameters": {  
          "type": "object",  
          "properties": {  
            "$connections": {  
              "type": "object",  
              "properties": {  
                "defaultValue": {  
                  "type": "object"  
                },  
                "type": {  
                  "type": "string"  
                }  
              }  
            },  
            "username": {  
              "type": "object",  
              "properties": {  
                "defaultValue": {  
                  "type": "string"  
                },  
                "type": {  
                  "type": "string"  
                }  
              }  
            }  
          }  
        }  
      }  
    }  

How to reference the parameters as input to Parse_JSON? If I pass in "parameters('username'), I get "ABCDE", not the JSON structure.

Answer 4

Hello @Noah Van Loen , I am sorry for the delay, I could not find a straight forward functionality to achieve the above requirement. I was able to find a work-around by using some of the inbuilt string operations. After performing the "Parse Json" I initialized a variable. Where I converted Parameters property to string and used split operation to get the "username" parameter name as shown below.

split(split(string(body('Parse_JSON')?['parameters']),',')2,':')[0]

The split property generates an array, and you can select any property name as required (You can also use 'Replace' just incase if required.). Then I performed concat operation as shown below.

concat(variables('parameterName'),'=',string(body('Parse_JSON')?['parameters']?['username']?['defaultValue']))

I understand that the above work-around is complex. Another option is to link a function app to your logic app to perform the required operations using code. Please let me know if you have any additional concerns.