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Perform string interpolation on existing, externally loaded text.

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Posted on by fuo

I'm trying to load text from an external source (txt file, database, etc) that ALREADY has Power Automate identifiers in it and I want them interpolated, but they're just coming out literal.

Example target string:

Lorem ipsum @{variables('varMap')?['dolor']} sit amet, consectetur adipiscing elit.

Where varMap is an Object variable that contains { "dolor": "D0L0R" }

This works as expected if I put the target string in a Compose following the Object variable init. But if I load that text from external source, then put its output in the Compose then the variable/dynamic text is not interpolated. Is there a way to force this to happen, like eval() in many scripting languages. Either another action or function?

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Chriddle 8,697 Super User 2026 Season 1 on at

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json(your_string)

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fuo 11 on at

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That fails. The input string is plain text (not json), loaded from external file.

This is my flow, the "Get file content" action is loading "Lorem ipsum @{variables('varMap')?['dolor']} sit amet, consectetur adipiscing elit." from a OneDrive file. The output I want is "Lorem ipsum D0L0R sit amet, consectetur adipiscing elit." but I'm just getting the original, uninterpolated text containing the code.

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Chriddle 8,697 Super User 2026 Season 1 on at

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Now I got it 🙂
Unfortunately, I don't know of anything better than string replacement
replace( outputs('Get_file_content')['body'], '@{variables(''varMap'')?[''dolor'']}', variables('varMap')?['dolor'] )

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