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parse JSON: Ignoring null value's when parsing JSON payload

All,

 

Question:

What are my options to make sure my 'parse JSON'  ignores/accepts null values when parsing JSON payload from a Http Response.  Are there alternate options to extract json elements for my scenario ?

 

 

Context:

---------

I am buidling flow to send out email based on contents of http JSON response. JSON response will have attributes with value as null.  Parse JSON is throwing error message  "message": "Invalid type. Expected Object but got Null." I do not use the json attributes with null values in the flow and ok to loose it.

 

 

schema

----------

{
  "type": "array",
  "items": {
    "type": "object",
    "properties": {
      "A": {
        "type": "string"
      },
      "B: {
        "type": "string"
      },
      "C": {
        "type": "string"
      },
      "D": {
        "type": "object"
      },
      "E": {
        "type": "string"
      },
      "F": {
        "type": "string"
      },
      "G": {
        "type": "string"
      },
      "H": {
        "type": "string"
      }
    },
    "required": [
      "A",
      "B",
      "C",
      "D",
      "E",
      "F",
      "G"
    
    ]
  }
}

 

 

 

JSON Payload

-------------------

{
      "A": "dfd",
      "B": "ASFS",
      "C": "asfs",
      "D": null,
      "E": "asFF",
      "F": "3244231",
      "D": "43124",
      "G": "qwqdas",
      "H": "zxz"
 }
     

 

 

 

Error Message

 

"message": "Invalid type. Expected Object but got Null."
   

 

 

5 REPLIES 5
Community Support Team
Community Support Team

Re: parse JSON: Ignoring null value's when parsing JSON payload

Hi @saadu,

 

I could confirm that the NULL value can't be recognized by Microsoft Flow, at least currently.

Syntax for GetRows

The empty function under Workflow Definition Language would work with the NULL value, but for other functions, not working.

I will forward this from my side, hope there should be some workarounds for this.

Regards,

Michael

 

Community Support Team _ Michael Shao
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Community Support Team
Community Support Team

Re: parse JSON: Ignoring null value's when parsing JSON payload

Hi @saadu,

 

Update here for the NULL value in WDL:
Quoted from Staff Samuel

"

Yes, technically the null operator ('?') and/or coalesce() function would work, but they require some hand-crafting if being used in the current Flow editor UI.

 

The workaround is that you can write a raw logicapp expression as long as it evaluates to a string. So for the possibly-null field, instead of using the automatic "Description" token in the UI, you'd write something like:

 

    Desc: @{coalesce(triggerBody()['description'], 'default description text')}

 

The caveats for falling back to a raw logicapp expresion:

    1. Must evaluate to a string

    2. Must have a string or character before the @ sign

    3. The field will become read-only after the initial save.

"

Reference: Is there a way to process null values from CRM to SharePoint.

Hope the information above is helpful.

Regards,

Michael

Community Support Team _ Michael Shao
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
ChrisCC
Level: Powered On

Re: parse JSON: Ignoring null value's when parsing JSON payload

Hi @v-micsh-msft,

 

Can you elaborate on this a little further? Are we using the operator within the Parse JSON function?

Highlighted
Ben_Love
Level: Powered On

Re: parse JSON: Ignoring null value's when parsing JSON payload

I recently had a similar challenge. My solution was to allow NULL values through my JSON Schema. In this way any NULL values passed did not cause error. 

 

EG:

 

"CompanyName": {
"type": [
"string",
"null"
]
}

ChrisCC
Level: Powered On

Re: parse JSON: Ignoring null value's when parsing JSON payload

Thanks @Ben_Love, very useful!

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