How can you encode to Base64 using Javascript?

Question

I have a PHP script that can encode a PNG image to a Base64 string (which is pretty easy since there's a PHP library that provides Base64 conversion)

I'd like to do the same thing using Javascript (in the XUL Javascript environment). I know how to open files, but I'm not sure how to do the encoding? I'm not used to working with binary data.

Answer 1

Here

Also, search on "javascript base64 encoding" turns a lot of other options, the above was the first one.

Answer 2

If you're writing Mozilla-specific code, then you can use btoa() and atob() to convert to and from base64 encoding. Otherwise, use something like the function Sunny referenced.