JavaScript: create a string or char from an UTF-8 value

Question

Same question as this, but with UTF-8 instead of ASCII

In JavaScript, how can you get a string representation of a UTF-8 value?

e.g. how to turn "c385" into "Å" ?

or how to turn "E28093" into "—" (m dash) ?

or how to turn "E282AC" into "€" (euro sign) ?

My question is NOT a duplicate of Hex2Asc. You can see for yourself: hex2a("E282AC") will transform the string into "â¬" instead of transforming it into "€" (euro sign) !!

Actually the same answer. However, I wonder what char code "c3 85" would represent? And \u00c3 is Ã, not Å. — Bergi
– Bergi, Commented Jun 12, 2013 at 4:08
It's not the same question at all. In fact, the question I quoted is the same with the one you pointed at. Wikipedia: In UTF-8 the hexadecimal representation of Å is "c3 85". The answer there it will transform the string into another character: Ã — BearCode
– BearCode, Commented Jun 12, 2013 at 4:21
Or it will transform "E28093" into "â", instead of transforming it into "—" (m dash) — BearCode
– BearCode, Commented Jun 12, 2013 at 4:28
Here's a simple algorithm to do what you wish: jsfiddle.net/consultcory/9K6th/2. If this question gets reopened I'll post it as an answer. — Cᴏʀʏ
– Cᴏʀʏ, Commented Jun 12, 2013 at 13:25

Community · Accepted Answer · 2017-05-23 10:28:10Z

3

I think this will do what you want:

function convertHexToString(input) {

    // split input into groups of two
    var hex = input.match(/[\s\S]{2}/g) || [];
    var output = '';

    // build a hex-encoded representation of your string
    for (var i = 0, j = hex.length; i < j; i++) {
        output += '%' + ('0' + hex[i]).slice(-2);
    }

    // decode it using this trick
    output = decodeURIComponent(output);

    return output;
}

console.log("'" + convertHexToString('c385') + "'");   // => 'Å'
console.log("'" + convertHexToString('E28093') + "'"); // => '–'
console.log("'" + convertHexToString('E282AC') + "'"); // => '€'

DEMO

Credits:

edited May 23, 2017 at 10:28

CommunityBot

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answered Jun 12, 2013 at 3:58

Cᴏʀʏ

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Comments

Diode · Accepted Answer · 2013-06-12 04:34:58Z

1

var hex = "c5";
String.fromCharCode(parseInt(hex, 16));

you have to use c5, not c3 85 ref: http://rishida.net/tools/conversion/

Lear more about code point and code unit

edited Jun 12, 2013 at 4:34

answered Jun 12, 2013 at 4:22

Diode

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1 Comment

BearCode Over a year ago

thanks but I need to convert from UTF-8, not from ASCII. C5 is the ASCII code and C3 85 is the UTF-8 code. Most of the characters are not encoded in ASCII but all of them are encoded in Unicode (and in UTF-8)

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