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 ❤️ JS

console.log(utf8Text);  // I ❤️ 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