JavaScript SyntaxError – Unexpected reserved word

JavaScript Reserved Words

Last Updated : 19 Jun, 2024

In JavaScript, you cannot use these reserved words as variable names, label names, or function names.

Reserved Words

abstract	arguments	boolean	break	byte
case	catch	char	const	continue
debugger	default	delete	do	double
else	eval	false	final	finally
float	for	function	goto	if
implements	in	instanceof	int	interface
long	native	new	null	package
private	protected	public	return	short
static	switch	synchronized	this	throw
throws	transient	true	try	typeof
var	void	volatile	while	with
yield

Reserved Words added in ECMAScript 5 and 6

awaits	class	enum	export
extends	import	let	super

Removed Reserved Words

The following reserved words have been removed from ECMAScript 5 and 6.

abstract	boolean	byte	char
double	final	float	goto
int	long	native	short
synchronized	throws	transient	volatile

Other Reserved Words

JavaScript can be used as the programming language in many applications.

alert	all	anchor	area	anchors
assign	blur	button	checkbox	clearInterval
clearTimeout	clientInformation	close	closed	confirm
constructor	crypto	decodeURI	decodeURIComponent	defaultStatus
document	element	elements	embed	embeds
encodeURI	encodeURIComponent	escape	event	fileUpload
focus	form	forms	frame	innerHeight
innerWidth	layer	link	location	mimeTypes
navigate	navigator	frames	frameRate	hidden
history	image	images	offscreenBuffering	open
opener	option	outerWidth	outerHeight	packages
pageXOffset	pageYOffset	parent	parseFloat	parseInt
password	pkcs11	plugin	prompt	propertyIsEnum
radio	reset	screenX	screenY	scroll
secure	select	self	setInterval	setTimeout
status	submit	taint	text	textarea

HTML Event Handlers

The name of all HTML event handlers should not be used in javascript

onblur	onclick	onerror
onfocus	onkeydown	onkeypress
onkeyup	onmouseover	onload
onmouseup	onmousedown	onsubmit

JavaScript SyntaxError – Unexpected reserved word

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