Execution environment
Chrome ver. 79.0
Confirmation of operation with console of Dev tool
Encoding to base64 is done with the btoa command
btoa("This is a test.")
> "VGhpcyBpcyBhIHRlc3Qu"
To decode a base64 encoded string, use the atob command
atob("VGhpcyBpcyBhIHRlc3Qu")
> "This is a test."
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