The btoa() method creates a Base64-encoded ASCII string from a binary string (i.e., a string in which each character in the string is treated as a byte of binary data).
An ASCII string containing the Base64 representation of data.
data
btoa on MDN
The binary string to encode.
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The btoa() method creates a Base64-encoded ASCII string from a binary string (i.e., a string in which each character in the string is treated as a byte of binary data).
Returns
An ASCII string containing the Base64 representation of
data.See
btoa on MDN