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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Ahh - it's almost certainly a problem with the upload. There are some huge hacks in the Web IDE to try and add support for non-ascii characters in strings.
Since you're only using base64, can you find a few extra characters that have character codes less than 128? http://www.asciitable.com/