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A JavaScript module that implements window.atob
and window.btoa
according the forgiving-base64 algorithm in the Infra Standard. The original code was forked from w3c/web-platform-tests.
Compatibility: Node.js version 3+ and all major browsers.
Install with npm
:
Per the spec, btoa
will accept strings "containing only characters in the range `U+0000` to `U+00FF`." If passed a string with characters above U+00FF
, btoa
will return null
. If atob
is passed a string that is not base64-valid, it will also return null
. In both cases when null
is returned, the spec calls for throwing a DOMException
of type InvalidCharacterError
.
If you want to include just one of the methods to save bytes in your client-side code, you can require
the desired module directly.
If you're submitting a PR or deploying to npm, please use the checklists in CONTRIBUTING.md.
Base64 comes from IETF RFC 4648 (2006).
btoa
**, the encoder function, stands for binary to ASCII, meaning it converts any binary input into a subset of ASCII (Base64).atob
**, the decoder function, converts ASCII (or Base64) to its original binary format.