Use fromCharCode() and btoa() method to Byte array to base64 in JavaScript.
The fromCharCode() method converts Unicode values into characters. It is a static method of the String object. The btoa() method encodes a string in base-64.
Convert a bytes array to base64 String example
A function/program that converts an array of bytes (i.e.: an array of integers from 0 to 255), to base64.
<!DOCTYPE HTML>
<html>
<body>
<script>
var arr = [
"1101000",
"1100101",
"1101100",
"1101100",
"1101111",
"100000",
"1110111",
"1101111",
"1110010",
"1101100",
"1100100"
];
var encode = function(d,a,e,b,c,f){c="";for(a=e=b=0;a<4*d.length/3;f=b>>2*(++a&3)&63,c+=String.fromCharCode(f+71-(f<26?6:f<52?0:f<62?75:f^63?90:87))+(75==(a-1)%76?"\r\n":""))a&3^3&&(b=b<<8^d[e++]);for(;a++&3;)c+="=";return c};
console.log(encode(arr));
</script>
</body>
</html> Output:
Convert arrayBuffer to Base64 string Example
Convert received arrayBuffer value into Base64 encoded string and then we write a file using toBinary() function of CFML bypassing Base64 encoded string in it. Below is custom JavaScript function arrayBufferToBase64() to accomplish the requirement.
<!DOCTYPE HTML>
<html>
<body>
<script>
var arr = [
"1101000",
"1100101",
"1101100",
"1101100",
"1101111",
"100000",
"1110111",
"1101111",
"1110010",
"1101100",
"1100100"
];
function arrayBufferToBase64( buffer ) {
var binary = '';
var bytes = new Uint8Array( buffer );
var len = bytes.byteLength;
for (var i = 0; i < len; i++) {
binary += String.fromCharCode( bytes[ i ] );
}
return window.btoa( binary );
}
console.log(arrayBufferToBase64(arr));
</script>
</body>
</html> Output:
Do comment if you have any doubts and suggestions on this JS Array byte topic.
Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.
OS: Windows 10
Code: HTML 5 Version