Help needed with base64tobinary expression

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Posted on by Nico_0710

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Hello everyone,

I have created a flow that triggers itself via a Power App. I give my flow a base64 text via PowerApps as a parameter.
In the flow I use a Compose action to convert the base64: base64ToBinary(triggerBody()['text'])

I have already checked whether it is actually a base64 and yes, it is. However, the flow always fails with the following error message: "InvalidTemplate. Unable to process template language expressions in action 'Compose' inputs at line '0' and column '0': 'The template language function 'base64ToBinary' was invoked with a parameter that is not valid. The value cannot be decoded from base64 representation.'."

I need help with this to solve my problem.

Thanks in advance!

Screenshot 2024-07-05 150943.png

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Nived_Nambiar 18,138 Super User 2026 Season 1 on at

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Hi @Nico_0710

as per the error details- i think that string you have provided is not of base64 representation- could you ensure that it follows base64 pattern ?

https://www.microfocus.com/documentation/enterprise-developer/ed60/ES-WIN/BKCJCJDEFNS009.html

Thanks & Regards,
Nived N 🚀

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Nico_0710 171 on at

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I fixed it,
I had an unnecessary part in my base64 string. I created a variable in Power Automate to cut that off and now its working fine.

Thank you.