JavaScript byte Array to String | Example code

An array is actually the ASCII code for a character. String.fromCharCode will convert each code into a character. Use String.fromCharCode with for loop to convert byte array to String in JavaScript.

JavaScript byte array to string Example

HTML Example code

With for loop

Here is use of, the String.fromCharCode function:

<!DOCTYPE HTML> 
<html> 
<body> 

	<script>
		var foo = [ 
		'73',
		'110',
		'118',
		'97',
		'108',
		'105',
		'100',
		'32',
		'112',
		'97',
		'115',
		'115',
		'119',
		'111',
		'114',
		'100',
		'0'];

		var str = '';
		for (var i=0; i<foo.length; ++i) {
			str+= String.fromCharCode(foo[i]);
		}

		console.log(str);

	</script>
</body> 
</html>		

A simple and better way

<script>
		var foo = [ 
		'73',
		'110',
		'118',
		'97',
		'108',
		'105',
		'100',
		'32',
		'112',
		'97',
		'115',
		'115',
		'119',
		'111',
		'114',
		'100',
		'0'];

		var str = String.fromCharCode.apply(null, foo);

		console.log(str);
</script>

Output: Result will be same because input byte array is same.

JavaScript byte Array to String

Hello world example for Converting byte array to string in JavaScript

Creating an function to parse each octet back to number, and use that value to get a character.

!DOCTYPE HTML> 
<html> 
<body> 

	<script>
		function bin2String(array) {
			var result = "";
			for (var i = 0; i < array.length; i++) {
				result += String.fromCharCode(parseInt(array[i], 2));
			}
			return result;
		}

		var arr = [
		"1101000",
		"1100101",
		"1101100",
		"1101100",
		"1101111",
		"100000",
		"1110111",
		"1101111",
		"1110010",
		"1101100",
		"1100100"
		];

		console.log(bin2String(arr));

	</script>
</body> 
</html>			

Output: hello world

Do comment if you have any doubts and suggestions on this JS array topic.

Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.

OS: Windows 10

Code: HTML 5 Version


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