How to convert Base64 to String in logic app inline code (Javascript)

Question

Summary: Logic app inline code (which uses NodeJS) is missing Buffer class.

Detailed: I am trying to trigger a logic app when some content is pushed into SFTP. I want to add some meta-data and save the details in the cosmos DB.

The issue is, The name of the file is received as a base64 encoded string in the inline code and Buffer is not available to parse it.

I even tried to create a set variable step (and decode filename there) but I am unable to pass this variable to the inline code step. (Not supported)

The final option would be to use cloud functions instead of inline code which I am trying to avoid.

Looking for a workaround for conversion.

Logic App error image link to ms doc

1. Doesn't support require() statements
2. Doesn't work with variables

Answer 1

Inline code can only perform the simplest Javascript operations, we may not be able to use Buffer.

As for passing the base64 encoded string, you can put it in Compose first, and then pass it in the inline code.

I suggest you use the built-in base64 related methods in the Azure logic app first.

If this does not meet your needs, you can create an Azure function and then call it in the Azure logic app.