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Anonymous
Not applicable

Parse Data Table with JSON - Error on Null Values

 I am applying a JSON script to parse a data table - eventually to convert it to a CSV as a downloadable file. 3 of the Columns/Fields in my Data Table may not contain any data (Account_Name, Delegated_To and Task_Notes), which is causing an error in the JSON flow. I have checked similar posts - all of which suggest to add the "null" options for those Columns/Fields - but that still returns an error. Here is the Parse JSON script which throws an error:

 

{
    "type""array",
    "items": {
        "type""object",
        "properties": {
            "Account_Name": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Administered_By": {
                "type""string"
            },
            "Allocated_To": {
                "type""string"
            },
            "Delegated_To": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Due_Date": {
                "type""string"
            },
            "Frequency": {
                "type""string"
            },
            "Governed_By": {
                "type""string"
            },
            "ID": {
                "type""integer"
            },
            "Managed_By": {
                "type""string"
            },
            "Reporting_Manager": {
                "type""string"
            },
            "Status": {
                "type""string"
            },
            "Task_Description": {
                "type""string"
            },
            "Task_Notes": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Warning": {
                "type""integer"
            }
        },
        "required": [
            "Account_Name",
            "Administered_By",
            "Allocated_To",
            "Delegated_To",
            "Due_Date",
            "Frequency",
            "Governed_By",
            "ID",
            "Managed_By",
            "Reporting_Manager",
            "Status",
            "Task_Description",
            "Task_Notes",
            "Warning"
        ]
    }
}
 
Here is the JSON script - with the "error elements" removed - this works because I have removed the 3 Columns from the output:
 
{
    "type""array",
    "items": {
        "type""object",
        "properties": {
            "Account_Name": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Administered_By": {
                "type""string"
            },
            "Allocated_To": {
                "type""string"
            },
            "Delegated_To": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Due_Date": {
                "type""string"
            },
            "Frequency": {
                "type""string"
            },
            "Governed_By": {
                "type""string"
            },
            "ID": {
                "type""integer"
            },
            "Managed_By": {
                "type""string"
            },
            "Reporting_Manager": {
                "type""string"
            },
            "Status": {
                "type""string"
            },
            "Task_Description": {
                "type""string"
            },
            "Task_Notes": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Warning": {
                "type""integer"
            }
        },
        "required": [
            "Administered_By",
            "Allocated_To",
            "Due_Date",
            "Frequency",
            "Governed_By",
            "ID",
            "Managed_By",
            "Reporting_Manager",
            "Status",
            "Task_Description",
            "Warning"
        ]
    }
}
 
Do I have the correct syntax for null values to be collated from the Data Table in the first version of the JSON script? I really can't see what I might have done wrong. The error message is of no use, since it is more to do with the fact that the JSON failed- but not what failed in the JSON!
 
Thanks!
13 REPLIES 13
abm
Most Valuable Professional
Most Valuable Professional

Hi @Anonymous 

 

Could you post a screenshot of your error?

 

Thanks



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Anonymous
Not applicable

Hi - thanks for looking - very much appreciated!

 

The Power Automate error message states that the schema validation failed. In the errors for the Output I see the following against every row of data where there are no Values for the Fields highlighted:

 

    "message""Required properties are missing from object: Account_Name, Delegated_To, Task_Notes.",
    "lineNumber"0,
    "linePosition"0,
    "path""[0]",
    "value": [
      "Account_Name",
      "Delegated_To",
      "Task_Notes"
    ],
    "schemaId""#/items",
    "errorType""required",
    "childErrors"
 
This seems to indicate to me that the "type" element I have entered for the 3 Fields - where I have entered "string", "null" - is probably being ignored, somehow. Or that the element showing "required" needs to be amended in some way because those 3 Fields have no Values to pass?
 
Thanks!
abm
Most Valuable Professional
Most Valuable Professional

Hi @Anonymous 

 

Thanks for your reply.  So generally when we generate a JSON schema it generates with the data what you have. Then later when we do the testing the data might have some inconsistencies such as some may be null but when we originally generate the schema that data may be present. Looks like some of fields here is missing. If this is passed the JSON schema action step that means your error is getting from your next step which the other system is expecting those values. Looks to me its a data issue. Where you getting this error? In Parse JSON Step?

 

Thanks



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Anonymous
Not applicable

Yes the error is being shown in the Power Flow Parse JSON Step. The Flow is being called by a PowerApp button, which contains the same JSON parameter list:

 

JSON(
ShowColumns(
SQLDATATABLENAME),
"Account_Name",
"Administered_By",
"Allocated_To",
"Delegated_To",
"Due_Date",
"Frequency",
"Governed_By",
"ID",
"Managed_By",
"Reporting_Manager",
"Status",
"Task_Description",
"Task_Notes",
"Warning"
),
JSONFormat.IndentFour
)
);

 

I still think the fact that there are no Values for the 3 error Fields within the originating Data Table is the issue.

abm
Most Valuable Professional
Most Valuable Professional

Hi @Anonymous 

 

If the error is in Parse JSON step add the null option in all the values. Let me know how it goes.

 

Thanks



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Anonymous
Not applicable

OK - all values within the JSON script contain the "null" value option - the output error remains the same - specific to the 3 Fields with null Values:

 

  {
    "message""Required properties are missing from object: Account_Name, Delegated_To, Task_Notes.",
    "lineNumber"0,
    "linePosition"0,
    "path""[0]",
    "value": [
      "Account_Name",
      "Delegated_To",
      "Task_Notes"
    ],
    "schemaId""#/items",
    "errorType""required",
    "childErrors": []
  },
Anonymous
Not applicable

I think it might be because the JSON in the PowerApp may not be including items from the Data Table where there are no Values - and is therefore not passing any data for those Fields - and is therefore not passing those Fields(?)

 

Perhaps there is something I can do in this section within the PowerApp JSON to enforce the inclusion of null data values for the 3 Fields where the error appears to be?

 

JSON(
ShowColumns(
SQLDATASOURCETABLE,
"Account_Name",
"Administered_By",
"Allocated_To",
"Delegated_To",
"Due_Date",
"Frequency",
"Governed_By",
"ID",
"Managed_By",
"Reporting_Manager",
"Status",
"Task_Description",
"Task_Notes",
"Warning"
),
JSONFormat.IndentFour

 

I am thinking perhaps to add some sort of WHERE clause to ensure the Field is included, even if there are no Values in the Row data?

abm
Most Valuable Professional
Most Valuable Professional

Hi @Anonymous 

 

Thanks for your reply. Are the below properties defined under the required?

 

Account_Name, Delegated_To, Task_Note

 

Thanks



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Anonymous
Not applicable

In the JSON in my Flow, the "properties" for each Field are complete. These precede the "required" elements, which do not contain any properties. For clarity -  the latest version of the full script is as follows:

 

{
    "type""array",
    "items": {
        "type""object",
        "properties": {
            "Account_Name": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Administered_By": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Allocated_To": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Delegated_To": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Due_Date": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Frequency": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Governed_By": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "ID": {
                "type": [
                    "integer",
                    "null"
                ]
            },
            "Managed_By": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Reporting_Manager": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Status": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Task_Description": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Task_Notes": {
                "type": [
                    "string",
                    "null"
                ]
            },
            "Warning": {
                "type": [
                    "integer",
                    "null"
                ]
            }
        },
        "required": [
            "Administered_By",
            "Allocated_To",
            "Due_Date",
            "Frequency",
            "Governed_By",
            "ID",
            "Managed_By",
            "Reporting_Manager",
            "Status",
            "Task_Description",
            "Warning"
        ]
    }
}
abm
Most Valuable Professional
Most Valuable Professional

Hi @Anonymous 

 

You could temporarily remove all the required parameter 

 

 "required": [
            "Administered_By",
            "Allocated_To",
            "Due_Date",
            "Frequency",
            "Governed_By",
            "ID",
            "Managed_By",
            "Reporting_Manager",
            "Status",
            "Task_Description",
            "Warning"
        ]
 
Also add all the properties can accept string or null. That might works.

 

Thanks 



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@Anonymous in the action after the Parse JSON set the Configure run after checkboxes to checked for if the Parse JSON action has succeeded or has failed.

 

Rob
Los Gallardos
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Anonymous
Not applicable

I tried this - it made no difference to the output - which still has the 3 x null Value Fields missing.

Anonymous
Not applicable

It does not fail. But it also does not include Columns for the 3 Fields which have null Values across all Rows.

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