Definition
JavaScript string escaping replaces characters that have syntactic or control meaning with escape sequences. A line break can be written as \n, a quotation mark as \", and a Unicode code point as \uXXXX or \u{...}.
const message = "First line\nSecond line";
const symbol = "\u{1F600}";Do not confuse three different operations
String escaping
Creates valid source or data-string representations such as \n and \uXXXX.
Legacy escape()
Produces %XX and %uXXXX. It is deprecated.
URI encoding
Represents UTF-8 bytes as percent-encoded sequences for URIs and components.
Security boundary
Escaping is contextual. A representation suitable for a JavaScript string is not automatically safe for HTML, a URL, CSS or a database query. Always choose the encoding required by the destination context.