JavaScript Reserved Words

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JavaScript has a number of reserved words that you cannot use as identifiers. Reserved words have a specific meaning to the JavaScript language, as they are part of the language syntax. Using a reserved word causes a compilation error when loading your script.

JavaScript also has a list of future reserved words. These words are not currently part of the JavaScript language, although they are reserved for future use.

Reserved Words

break	delete	if	this	while
case	do	in	throw	with
catch	else	instanceof	try
continue	finally	new	typeof
debugger	for	return	var
default	function	switch	void

Future Reserved Words

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class	extends	let	public
const	implements	package	static
enum	import	private	super
export	interface	protected	yield

When choosing identifiers it is also important to avoid any words that are already the names of intrinsic JavaScript objects or functions, such as String or parseInt.