Window atob() Method

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# Window atob() Method

Window Object

## Example

Decode a base-64 encoded string:

var str = "Hello World!";
var enc = window.btoa(str);
var dec = window.atob(enc);
var res = "Encoded String: " + enc + "<br>" + "Decoded String: " + dec;

The result of res will be:

Encoded String: SGVsbG8gV29ybGQh
Decoded String: Hello World!
Try it yourself »

## Definition and Usage

The atob() method decodes a base-64 encoded string.

This method decodes a string of data which has been encoded by the btoa() method.

## Browser Support

The atob() method is supported in all major browsers.

## Syntax

window.atob(encodedStr)

## Parameter Values

Parameter | Description
--- | ---
encodedStr | Required. The string which has been encoded by the btoa() method

## Return Value

Type | Description
--- | ---
String | The decoded string

Window Object

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