String isWellFormed() and toWellFormed()The isWellFormed() method of strings returns a boolean indicating if the string contains any Unicode lone surrogates. The toWellFormed() method returns a new string where all lone surrogates are replaced by the Unicode replacement character.stringStringswidely2023-10-242026-04-24https://tc39.es/ecma262/multipage/text-processing.html#sec-string-objectshttps://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String/isWellFormedjavascript.builtins.String.isWellFormedjavascript.builtins.String.toWellFormedhttps://nowyoucanuse.com/features--string-wellformed.html