Power fx expression for converting dataUriToString() . 

This scenario is mainly used to find the name, location of resource file which is in uniform format for websites. 

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High level resolution steps 

The given input gets converted from text to dataUri format with compose action.

Then converted dataUri format gets converted to string format with another compose action.

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Detailed resolution steps 

Step 1 

Add a “manually a trigger flow” in power automate, click on add input.

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Step 2

Add compose as action, (‘+’button) ,under input dialogbox the expression tab will be available and then type : dataUri(triggerBody()[‘text’]).

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Step 3

Add another compose as action,(‘+’ button) under input dialogbox the expression tab will be available and then type : dataUriToString(outputs(‘Compose’)) as shown below.

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Step 4

Then save and run the flow with input example “Hi, how are you?”.  

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Output

We get output in the form of dataUri where, 

(data:text/plain is data:content/type,

charset=utf-8 is character encoding system to represent as ASCII text, 

base64 ‘converts binary data to text’ and 

SGksIGhvdyBhcmUgeW91Pw == is for input Hi,how are you?).

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After converting input to dataUri() form. When we use compose of dataUriToString() form, it returns back in the form of string for output as shown below.