decodeURI()

The decodeURI() function decodes a Uniform Resource Identifier (URI) previously created by encodeURI() or by a similar routine.

decodeURI(encodedURI)

encodedURI

A complete, encoded Uniform Resource Identifier.

A new string representing the unencoded version of the given encoded Uniform Resource Identifier (URI).

Throws an URIError ("malformed URI sequence") exception when encodedURI contains invalid character sequences.

Replaces each escape sequence in the encoded URI with the character that it represents, but does not decode escape sequences that could not have been introduced by encodeURI. The character “#” is not decoded from escape sequences.

decodeURI('https://developer.mozilla.org/ru/docs/JavaScript_%D1%88%D0%B5%D0%BB%D0%BB%D1%8B');
// "https://developer.mozilla.org/ru/docs/JavaScript_шеллы"

try {
  var a = decodeURI('%E0%A4%A');
} catch(e) {
  console.error(e);
}

// URIError: malformed URI sequence

• decodeURIComponent()
• encodeURI()
• encodeURIComponent()