js convert string to utf8

JavaScript

[Edit]

js convert string to utf8

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// Note: JavaScript engine stores string literals in the UTF-16 encoding format.

const utf16Text = 'I ❤️ JS';                               // I ❤️ JS
const utf8Text = unescape(encodeURIComponent(utf16Text));  // I â¤ï¸ JS

console.log(utf8Text);  // I â¤ï¸ JS


// Warning:
//
//   Although unescape() is not strictly deprecated (as in "removed from the Web standards"),
//   it is defined in Annex B of the ECMA-262 standard, whose introduction states:
//
//     … All of the language features and behaviors specified in this annex have one or more
//       undesirable characteristics and in the absence of legacy usage would be removed from
//       this specification. … … Programmers should not use or assume the existence of these 
//       features and behaviors when writing new ECMAScript code. …
//
// Source: 
//   https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/unescape
//
// See also:
//   https://dirask.com/questions/What-encoding-uses-JavaScript-to-stores-string-jM73zD

[Edit]

js convert string to utf8

Leen-Kerr

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// Note: Almost all JavaScript engines by default store string literals using UTF-16 encoding format.
//       By using the below function we do conversion from default encoding to UTF-8 encoding.

var toUtf8 = function(text) {
  	var surrogate = encodeURIComponent(text);
  	var result = '';
    for (var i = 0; i < surrogate.length;) {
        var character = surrogate[i];
		i += 1;
        if (character == '%') {
        	var hex = surrogate.substring(i, i += 2);
			if (hex) {
				result += String.fromCharCode(parseInt(hex, 16));
			}
        } else {
        	result += character;
        }
    }
    return result;
};


// Usage example:

const utf16Text = 'I ❤️ JS';         // I ❤️ JS
const utf8Text = toUtf8(utf16Text);  // I â¤ï¸ JS

console.log(utf8Text);  // I â¤ï¸ JS


// See also:
//   https://dirask.com/questions/What-encoding-uses-JavaScript-to-stores-string-jM73zD

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[Edit]

js convert string to utf8

Vanessa-Drake

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// Note: JavaScript engine stores string literals in the UTF-16 encoding format.

var toUtf8 = function(text) {
  	return unescape(encodeURIComponent(text));
};


// Usage example:

const utf16Text = 'I ❤️ JS';         // I ❤️ JS
const utf8Text = toUtf8(utf16Text);  // I â¤ï¸ JS

console.log(utf8Text);  // I â¤ï¸ JS


// Warning:
//
//   Although unescape() is not strictly deprecated (as in "removed from the Web standards"),
//   it is defined in Annex B of the ECMA-262 standard, whose introduction states:
//
//     … All of the language features and behaviors specified in this annex have one or more
//       undesirable characteristics and in the absence of legacy usage would be removed from
//       this specification. … … Programmers should not use or assume the existence of these 
//       features and behaviors when writing new ECMAScript code. …
//
// Source:
//   https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/unescape
//
// See also:
//   https://dirask.com/questions/What-encoding-uses-JavaScript-to-stores-string-jM73zD

[Edit]

js convert string to utf8

Evania

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// Note: Almost all JavaScript engines by default store string literals using UTF-16 encoding format.
//       By using the below function we do conversion from default encoding to UTF-8 encoding.

function toUtf8(text) {
    var result = '';
    for (var i = 0; i < text.length; i++) {
        var code = text.charCodeAt(i);
        if (code < 0x80) {
            result += String.fromCharCode(code);
        } else {
            if (code < 0x800) {
                result += String.fromCharCode(code >> 6 & 0x1F | 0xC0);
            } else {
                result += String.fromCharCode(code >> 12 | 0xE0);
                result += String.fromCharCode(code >> 6 & 0x3F | 0x80);
            }
            result += String.fromCharCode(code & 0x3F | 0x80);
        }
    }
    return result;
}


// Usage example:

const utf16Text = 'I ❤️ JS';          // I ❤️ JS
const utf8Text = toUtf8(utf16Text);  // I â¤ï¸ JS

console.log(utf8Text);  // I â¤ï¸ JS


// See also:
//   https://dirask.com/questions/What-encoding-uses-JavaScript-to-stores-string-jM73zD

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