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This feature is well established and works across many devices and browser versions. Its been available across browsers since 2023 10.
String toWellFormed() U+FFFD .
toWellFormed()
.
JavaScript UTF-16 . UTF-16 , UTF-16 , .
toWellFormed() U+FFFD . encodeURI . toWellFormed() .
TextEncoder . ( ) .
const strings = [
//
"ab\uD800",
"ab\uD800c",
//
"\uDFFFab",
"c\uDFFFab",
//
"abc",
"ab\uD83D\uDE04c",
];
for (const str of strings) {
console.log(str.toWellFormed());
}
// Logs:
// "ab"
// "abc"
// "ab"
// "cab"
// "abc"
// "abc"
encodeURI . toWellFormed() .
const illFormed = "https://example.com/search?q=\uD800";
try {
encodeURI(illFormed);
} catch (e) {
console.log(e); // URIError: URI malformed
}
console.log(encodeURI(illFormed.toWellFormed())); // "https://example.com/search?q=%EF%BF%BD"
| Specification |
|---|
| ECMAScript 2027 LanguageSpecification # sec-string.prototype.towellformed |
String.prototype.toWellFormed in core-jsString.prototype.isWellFormed()String.prototype.normalize()This page was last modified on 2024 6 24 by MDN contributors.
StringString.prototype.anchor()String.prototype.at()String.prototype.big()String.prototype.blink()String.prototype.bold()String.prototype.charAt()String.prototype.charCodeAt()String.prototype.codePointAt()String.prototype.concat()String.prototype.endsWith()String.prototype.fixed()String.prototype.fontcolor()String.prototype.fontsize()String.prototype.includes()String.prototype.indexOf()String.prototype.isWellFormed()String.prototype.italics()String.prototype.lastIndexOf()String.prototype.link()String.prototype.localeCompare()String.prototype.match()matchAll()String.prototype.normalize()String.prototype.padEnd()String.prototype.padStart()String.prototype.repeat()String.prototype.replace()String.prototype.replaceAll()String.prototype.search()String.prototype.slice()String.prototype.small()String.prototype.split()String.prototype.startsWith()String.prototype.strike()String.prototype.sub()String.prototype.substr()String.prototype.substring()String.prototype.sup()String.prototype.toLocaleLowerCase()String.prototype.toLocaleUpperCase()String.prototype.toLowerCase()String.prototype.toString()String.prototype.toUpperCase()String.prototype.toWellFormed()String.prototype.trim()String.prototype.trimEnd()String.prototype.trimStart()String.prototype.valueOf()String.prototype[@@iterator]()Object/FunctionObject.prototype.__defineGetter__()Object.prototype.__defineSetter__()Object.prototype.__lookupGetter__()Object.prototype.__lookupSetter__()Object.prototype.hasOwnProperty()Object.prototype.isPrototypeOf()Object.prototype.propertyIsEnumerable()Object.prototype.toLocaleString()Object.prototype.toString()Object.prototype.valueOf()Your blueprint for a better internet.
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