Compatibility: Node.js version 3+ and all major browsers.
npm install abab
btoa (base64 encode)
const btoa = ;; // 'SGVsbG8sIHdvcmxkIQ=='
atob (base64 decode)
const atob = ;; // 'Hello, world!'
Per the spec,
btoa will accept strings "containing only characters in the range
U+00FF." If passed a string with characters above
btoa will return
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
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.
const atob = ;const btoa = ;
If you're submitting a PR or deploying to npm, please use the checklists in CONTRIBUTING.md
Here's a mnemonic that might be useful: if you have a plain string and want to base64 encode it, then decode it,
btoa is what you run before (before - btoa), and
atob is what you run after (after - atob).