encodeURI()

The encodeURI() function encodes a URI by replacing each instance of certain characters by one, two, three, or four escape sequences representing the UTF-8 encoding of the character (will only be four escape sequences for characters composed of two surrogate characters). Compared to encodeURIComponent(), this function encodes fewer characters, preserving those that are part of the URI syntax.

encodeURI() is a function property of the global object.

The encodeURI() function escapes characters by UTF-8 code units, with each octet encoded in the format %XX, left-padded with 0 if necessary. Because lone surrogates in UTF-16 do not encode any valid Unicode character, they cause encodeURI() to throw a URIError.

Syntax example: encodeURI(uri)