The template language function ‘length’ expects its parameter to be an array or a string Power Automate

In this Power BI Tutorial, we will discuss how to fix the Power BI error “The template language function ‘length’ expects its parameter to be an array or a string. The provided value is of type ‘Integer’“.

The template language function ‘length’ expects its parameter to be an array or a string

Recently, I was doing a Power Automate of flow example on how to auto generate column value using Power Automate or Flow in SharePoint.

There I was using an expression like the below, which was causing the issue.

length(triggerBody()?['ID'])

Basically, I was trying to get the length of the ID column value.

But it throws an error as,

Unable to process template language expressions in action ‘Initialize_variable’ inputs at line ‘1’ and column ‘10896’: ‘The template language function ‘length’ expects its parameter to be an array or a string. The provided value is of type ‘Integer’. Please see https://aka.ms/logicexpressions#length for usage details.’.

And the error looks like the below:

I was using the expression below:

Here, I was trying to get the length of the ID list column, this is an integer column.

So, we need to convert to string to get the length of the ID column value.

In Power Automate or flow expression, we can convert int to string like below:

length(string(triggerBody()?['ID']))

The expression should look like the below:

This is how we can get the length in Power Automate or flow.

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This is how we can fix the error, ‘The template language function ‘length’ expects its parameter to be an array or a string. The provided value is of type ‘Integer’.