JavaScript Reference

JavaScript specifies a list of keywords that should not be used as names to identify variables, objects, and other elements in the code. In addition, a set of reserved keywords is allocated for future use. These should not be used either.

JavaScript Tutorial


Below are the JavaScript keywords. These cannot be used as variables, functions, or object identifiers.

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

In addition, the literals null, true, and false are reserved for their standard usage.

Reserved Keywords

The EcmaScript specification has the following list of words reserved for future use. You should not use these as identifiers in your JavaScript code.

 JavaScript Reserved Keywords
class implements package static
enum import private super
export interface protected yield
extends let public

Last updated on Sep 30, 2023