How to convert from Hex string to ASCII string in JavaScript?
Ex:
332343630 it will be 2460
9 Answers
function hex2a(hexx) { var hex = hexx.toString();//force conversion var str = ''; for (var i = 0; i < hex.length; i += 2) str += String.fromCharCode(parseInt(hex.substr(i, 2), 16)); return str;
}
hex2a('32343630'); // returns '2460'Another way to do it (if you use Node.js):
var input = '32343630';
const output = Buffer.from(input, 'hex');
log(input + " -> " + output); // Result: 32343630 -> 2460For completeness sake the reverse function:
function a2hex(str) { var arr = []; for (var i = 0, l = str.length; i < l; i ++) { var hex = Number(str.charCodeAt(i)).toString(16); arr.push(hex); } return arr.join('');
}
a2hex('2460'); //returns 32343630You can use this..
var asciiVal = "32343630".match(/.{1,2}/g).map(function(v){ return String.fromCharCode(parseInt(v, 16)); }).join('');
document.write(asciiVal);** for Hexa to String**
let input = '32343630';Note : let output = new Buffer(input, 'hex'); // this is deprecated
let buf = Buffer.from(input, "hex");
let data = buf.toString("utf8");I found a useful function present in web3 library.
var hexString = "0x1231ac"
string strValue = web3.toAscii(hexString)Update: Newer version of web3 has this function in utils
The functions now resides in utils:
var hexString = "0x1231ac"
string strValue = web3.utils.hexToAscii(hexString)I've found that the above solution will not work if you have to deal with control characters like 02 (STX) or 03 (ETX), anything under 10 will be read as a single digit and throw off everything after. I ran into this problem trying to parse through serial communications. So, I first took the hex string received and put it in a buffer object then converted the hex string into an array of the strings like so:
buf = Buffer.from(data, 'hex');
l = Buffer.byteLength(buf,'hex');
for (i=0; i<l; i++){ char = buf.toString('hex', i, i+1); msgArray.push(char);
}Then .join it
message = msgArray.join('');then I created a hexToAscii function just like in @Delan Azabani's answer above...
function hexToAscii(str){ hexString = str; strOut = ''; for (x = 0; x < hexString.length; x += 2) { strOut += String.fromCharCode(parseInt(hexString.substr(x, 2), 16)); } return strOut;
}then called the hexToAscii function on 'message'
message = hexToAscii(message);This approach also allowed me to iterate through the array and slice into the different parts of the transmission using the control characters so I could then deal with only the part of the data I wanted. Hope this helps someone else!
0console.log(
"68656c6c6f20776f726c6421".match(/.{1,2}/g).reduce((acc,char)=>acc+String.fromCharCode(parseInt(char, 16)),"")
)An optimized version of the implementation of the reverse function proposed by @michieljoris (according to the comments of @Beterraba and @Mala):
function a2hex(str) { var hex = ''; for (var i = 0, l = str.length; i < l; i++) { var hexx = Number(str.charCodeAt(i)).toString(16); hex += (hexx.length > 1 && hexx || '0' + hexx); } return hex;
}
alert(a2hex('2460')); // display 32343630
