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check if the property exists

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Posted on by xvzms

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Hi, In my flow I try to get address from Dataverse table.

This column address is not required in the table.
When the address is exist, flow run successfully, but when did not exist I get error message.

How can I check if this value is exist and if no add an empty value?

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Ellis Karim 11,940 Super User 2026 Season 1 on at

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Hi @xvzms,

Try using the "bracket notation with a question mark" (query method):

if( equals(body('Get_a_row_by_ID')?['address1_country'], null), '', body('Get_a_row_by_ID')?['address1_country'] )

The use of the question mark in JSON specifies that if the property being referenced does not exist then a null value will be returned instead of throwing an error.

So, if the property 'address1_country' is missing, the expression body('Get_a_row_by_ID')?['address1_country'] will return null.

You can also use the empty function to shorten the above expression to:

if( empty(body('Get_a_row_by_ID')?['address1_country']), '', body('Get_a_row_by_ID')?['address1_country'] )

For more details, please see How to Query JSON Data Using JSON Notation with Power Automate❔❔❓ – Ellis Karim's Blog

Ellis Karim

Blog: https://elliskarim.com

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