WorkerGlobalScope: atob() method
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Note: This feature is only available in Web Workers.
The atob() method of the WorkerGlobalScope interface decodes a
string of data which has been encoded using Base64 encoding. You can use
the WorkerGlobalScope.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.
Syntax
atob(encodedData)
Parameters
encodedData-
A binary string (i.e., a string in which each character in the string is treated as a byte of binary data) containing base64-encoded data.
Return value
An ASCII string containing decoded data from encodedData.
Exceptions
InvalidCharacterErrorDOMException-
Thrown if
encodedDatais not valid base64.
Examples
const encodedData = self.btoa("Hello, world"); // encode a string
const decodedData = self.atob(encodedData); // decode the string
Specifications
| Specification |
|---|
| HTML # dom-atob-dev |
Browser compatibility
| desktop | mobile | server | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
atob
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Available in workers
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
See also
- A polyfill of
atobis available incore-js dataURLsWindow.atob(): the same method, but in window scopes.WorkerGlobalScope.btoa()Uint8Array.fromBase64()