Check if Object Key Exists

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Posted on by AH-28020957-0

How can I check if an object does have a certain key inside? Like checking if objectX.keyY exists and not null.

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Power Automate Desktop

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eetuRobo 4,393 Super User 2025 Season 2 on at

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You could do condition that checks if the object contains the key as text.

But that would also be true if there isn't "includesCobra" key but a value like that.

You can use On block error to continue the flow even if error happens.

So you would have set variable to get the value of certain key in that object. Then if it doesn't exist error happens but On block lets the flow continue.

If the key was not in the object then the variable will be empty. And if its not empty then the key was in the object

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AH-28020957-0 19 on at

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I have many fields I need to check, do we really need to end up with this complicated flow for it? Don't we have an easier solution?

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eetuRobo 4,393 Super User 2025 Season 2 on at

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One bit hacky way could be to convert the object to JSON and then do the checks to see if the json contains: "Key":"
So if I want to check if my object has the key "FirstName" then I check if the json contains: "FirstName":"

Like so:

This should only match the keys and not values.

Or final way would be to create a script that checks if the object contains the key. I don't know any cleaner ways than these sorry.

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Riyaz_riz11 4,000 Super User 2025 Season 2 on at

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HI,

Basic Key Existence Check

Action: If Condition: %Contains(objectX, "keyY")% Operation: Equal to (=) Second operand: True

Key Exists AND Not Null Check

Action: If Condition: %Contains(objectX, "keyY") AND objectX["keyY"] <> $null% Operation: Equal to (=) Second operand: True

Complete Expression for Your Use Case

First operand: %Contains(objectX, "keyY") AND objectX["keyY"] <> $null AND objectX["keyY"] <> ""% Operator: Equal to (=) Second operand: true

Method 2: Using Try-Catch Pattern

Set up Try-Catch with Variables

# Initialize variable VARIABLE %KeyExists% VALUE: False # Try block BEGIN TRY SET %TestValue% TO %objectX["keyY"]% IF %TestValue% <> $null THEN SET %KeyExists% TO True END IF END TRY # Catch block BEGIN CATCH SET %KeyExists% TO False END CATCH # Use in condition IF %KeyExists% = True THEN # Key exists and is not null END IF

If I have answered your question, please mark it as the preferred solution ✅ . If you like my response, please give it a Thumbs Up 👍.
Regards,
Riyaz

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AH-28020957-0 19 on at

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The first basic check works, but the second null checker is having a syntax error, I think because of $null..

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