CODEWITHSUNDEEP
javascriptutf-8character-encodinghextypechecking
user1382306
user1382306

Reputation:

Check if string is UTF-8 returning \u+hex if so, false if not

For XSS safety, I'd like to convert all characters to \u+hex encoding. I've seen UTF-16 solutions, but I can't find anything for UTF-8.

I first want to ensure that all characters are UTF-8. Here, I've seen many solutions but nothing consistent for javascript.

How can a string be tested for UTF-8 and return the \u+hex encoding if so yet false if not?

Upvotes: 0

Views: 1225

Answers (1)

username
username

Reputation: 141

function string_to_hex(input) {
    var temp = 0, output = "";
    for (var i = 0; i < input.length; i++) {
        temp = input.charCodeAt(i);
        if (temp > 0xFF) {
//      if (temp == 192 || temp == 193 || temp > 244) {
            return false;
        }
        output += "\\x" + temp.toString(16).slice(1); //lazy padding
    }
    return output;
}

The line commented out isn't needed if you do not check for illegal code points.

Upvotes: 2

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