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  • Alex Martinez

Understanding the "illegal base64 character" error (Java, Groovy and Mule 4 - DW 2.0)

Updated: Aug 24, 2021

Jul 21, 2020 | ProstDev

Are you familiar with the fromBase64 or the toBase64 functions from DataWeave 2.0? What about the getUrlEncoder or the getEncoder functions from Java? Do you know the differences between the “basic” Base 64 encoding and the “URL and Filename safe” Base 64 encoding? Well, you may have guessed it by now, but you’re about to find out the answers to these questions!

Or maybe you’re here because you keep getting the “Illegal base64 character” error in DataWeave. Even if you get this error using any other programming language, this post can help you understand why it is happening.

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