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The Base64 decode

The traditional (MIME) base64 encoding and decoding processes are fairly simple to implement. Here an example using JavaScript is given, including the MIME/etc required line breaks at particular line lengths. It is worth noting however, that many base64 functions (e.g. in PHP) return base64 encoded strings without the line breaks, as the line breaks can be inserted easily after encoding, and many times the base64 encoding is desired only for safely transferring data via XML or inserting into a database, etc. — times when the line breaks are known to be unnecessary and therefore undesirable. The newline inserting and removing in these functions here can easily be commented out (they are each only one line in the respective functions) if they are not needed.

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