Hexadecimal number to char using JavaScript

Question

How do I convert, for example, the string "C3" to its character using JavaScript? I've tried charCodeAt, toString(16) and everything, but it doesn't work.

var justtesting = "C3"; // There's an input here
var tohexformat = '\x' + justtesting; // Gives the wrong hexadecimal number

var finalstring = tohexformat.toString(16);

You also don't have quotes around C3, so it's not interpreting it as a string. — Iluvatar
– Iluvatar, Commented Dec 5, 2016 at 14:53
OP is not attempting to convert decimal values to hexadecimal. — Mike Cluck
– Mike Cluck, Commented Dec 5, 2016 at 14:55
yep. it's a string.. i just can't turn a string to an hex, i.e 31 to number 1 cause when i try to add \x it gives me just two more chars, instead of a hex value — i.Dio
– i.Dio, Commented Dec 5, 2016 at 14:56

Mike Cluck · Accepted Answer · 2016-12-05 14:59:29Z

23

All you need is parseInt and possibly String.fromCharCode.

parseInt accepts a string and a radix, a.k.a the base you wish to convert from.

console.log(parseInt('F', 16));

String.fromCharCode will take a character code and convert it to the matching string.

console.log(String.fromCharCode(65));

So here's how you can convert C3 into a number and, optionally, into a character.

var input = 'C3';
var decimalValue = parseInt(input, 16); // Base 16 or hexadecimal
var character = String.fromCharCode(decimalValue);
console.log('Input:', input);
console.log('Decimal value:', decimalValue);
console.log('Character representation:', character);

answered Dec 5, 2016 at 14:59

Mike Cluck

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Comments

Peter Mortensen · Accepted Answer · 2023-08-16 05:58:59Z

0

Another simple way is to print "&#" + CharCode like this:

for(var i=9984; i<=10175; i++){
    document.write(i + "&nbsp;&nbsp;&nbsp;" + i.toString(16) + "&nbsp;&nbsp;&nbsp;&#" + i + "<br>");
}

OR

for(var i=0x2700; i<=0x27BF; i++){
    document.write(i + "&nbsp;&nbsp;&nbsp;" + i.toString(16) + "&nbsp;&nbsp;&nbsp;&#" + i + "<br>");
}

JSFIDDLE

edited Aug 16, 2023 at 5:58

Peter Mortensen

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answered Jun 9, 2020 at 16:19

qpaycm

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2 Comments

Peter Mortensen Over a year ago

Is this a bogus answer? What are the magic numbers 9984 and 10175? What is the intent?

qpaycm Over a year ago

@PeterMortensen magic numbers are just a decimal representation of utf-8 character. The intent to demostrate a simple example how to turn a hexadecimal/decimal number into a char using javascript.

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