For more details, see the documentation for btoa(). Note that btoa() expects to be passed binary data, and will throw an exception if the given string contains any characters whose UTF-16 representation occupies more than one byte. To do this, by mapping values from the Base64 Characters Table replace each character by its index (if you cannot find an index for a specific group, just discard it). The algorithm used by atob() and btoa() is specified in RFC 4648, section 4. Each group (letter) is a Base64 character that has its own index, and now your task is to convert groups to indices. atob(): decodes a Base64-encoded string('atob' should be read as 'ASCII to binary'). In computer programming, Base64 is a group of binary-to-text encoding schemes that represent binary data in sequences of 24 bits that can be represented by.btoa(): creates a Base64-encoded ASCII string from a 'string' of binary data ('btoa' should be read as 'binary to ASCII').In JavaScript there are two functions respectively for decoding and encoding Base64 strings: One common application of Base64 encoding on the web is to encode binary data so it can be included in a data: URL. Base64 is commonly used in a number of applications including email via MIME, and storing complex data in XML. This is to ensure that the data remain intact without modification during transport. The term Base64 originates from a specific MIME content transfer encoding.Д«ase64 encoding schemes are commonly used when there is a need to encode binary data that needs to be stored and transferred over media that are designed to deal with ASCII.

Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation.

Base64 encoding explanation