atob()
The atob()
function decodes a
string of data which has been encoded using Base64 encoding. You can use
the btoa()
method to encode and transmit
data which may otherwise cause communication problems, then transmit it and use the
atob()
method to decode the data again. For example, you can encode,
transmit, and decode control characters such as ASCII values 0 through 31.
For use with Unicode or UTF-8 strings, see the note on "Unicode strings" in the page
for btoa()
.
Syntax
var decodedData = atob(encodedData);
Parameters
encodedData
-
A binary string contains an base64 encoded data.
Return value
An ASCII string containing decoded data from encodedData
.
Exceptions
InvalidCharacterError
DOMException
-
Thrown if
encodedData
is not valid base64.
Example
const encodedData = btoa('Hello, world'); // encode a string
const decodedData = atob(encodedData); // decode the string
Specifications
Specification |
---|
HTML Standard # dom-atob-dev |
Browser compatibility
BCD tables only load in the browser
See also
- A polyfill of
atob
is available incore-js
data
URIsbtoa()