HTML | DOM Window btoa() Method
The Window btoa() method is used for encoding a string in base-64 format.
The characters used by the Window btoa() method to encode the string are “A-Z”, “a-z”, “0-9”, “+”, “/” and “=” .
Syntax:
window.btoa(String)
Parameters Used:
- String: It is a mandatory parameter which specifies the string to be encoded.
Return Value: It returns a string that represents the encoded string of base-64.
Below program illustrates the Window btoa() Method:
Encoding a string in base-64 format.
html
<!DOCTYPE html><html><head> <title> Window btoa() Method in HTML </title> <style> h1 { color: green; } h2 { font-family: Impact; } body { text-align: center; } </style></head><body> <h1>GeeksforGeeks</h1> <h2>Window btoa() Method</h2> <p> For encoding a string in base-64 format, double click the "Encode Message" button: </p> <button ondblclick="encode()"> Encode Message </button> <p id="myEncoding"></p> <script> function encode() { var original = "GeeksforGeeks"; var encoded = window.btoa(original); var output = "Encoded String : " + encoded; document.getElementById("myEncoding").innerHTML = "Original String: " + original + "<br>" + output; } </script></body></html> |
Output:
After clicking the button:
Supported Browsers: The browser supported by Window btoa( ) Method are listed below:
- Google Chrome 4
- Edge 12
- Internet Explorer 10
- Firefox 1
- Opera 10.5
- Safari 3
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