Converting Unicode characters to hexadecimal format in JavaScript

Other Questions JavaScript
1

I need help with transforming Unicode text into hex format using JavaScript. My current approach works fine for regular ASCII characters but breaks when I try to process Unicode symbols like Chinese characters.

Here’s my current code:

function hexToString(hexValue) {
    var hexData = hexValue.toString();
    var result = '';
    for (var index = 0; index < hexData.length; index += 2)
        result += String.fromCharCode(parseInt(hexData.substr(index, 2), 16));
    return result;
}

function stringToHex(text) {
    var hexOutput = '';
    for(var position = 0; position < text.length; position++) {
        hexOutput += '' + text.charCodeAt(position).toString(16);
    }
    return hexOutput;
}

When I test it with Chinese characters like “漢字”, instead of getting the correct hex representation, I get garbled output like “ªo”[W".

Is there a way to properly handle Unicode characters in JavaScript for this conversion? What am I missing in my approach?

2

ur code only handles single-byte chars. unicode needs different aproach - try using codePointAt() instead of charCodeAt() and String.fromCodePoint() for decoding. also pad your hex values properly or you’ll get weird results with shorter codes.

3

The issue stems from JavaScript’s internal string representation handling. Your current method treats each character as a single unit, but Unicode characters often require multiple bytes. I encountered this exact problem when building a text encoding utility last year. The key fix is implementing proper UTF-16 handling. You need to check for surrogate pairs in your conversion logic. Characters with code points above 0xFFFF get split into high and low surrogates, which your current code processes incorrectly. For the hex-to-string conversion, you should also validate the input format first. Unicode hex values need consistent padding to avoid parsing errors. I recommend adding a normalization step that ensures all hex pairs are properly formatted before processing. The garbled output you’re seeing happens because the decoder tries to interpret multi-byte sequences as individual ASCII characters. Testing with various Unicode ranges helped me identify these edge cases during development.

4

Had similar issues when working on a multilingual chat application. The main problem is that your stringToHex function doesn’t pad the hex values correctly. Unicode characters can produce hex codes of varying lengths, and without proper padding, the decoding process gets confused about where one character ends and another begins. For Chinese characters specifically, you’re dealing with values that often exceed the basic multilingual plane. I found that adding a simple padding mechanism fixes most conversion errors. Also worth noting that your hexToString function assumes every hex pair represents a complete character, which isn’t always true for Unicode. Consider checking the range of your hex values before processing them. When I tested similar code with Japanese characters, the same padding issue caused identical garbled output until I normalized the hex string format first.