JavaScript/Reserved Words

This page contains a list of reserved words in JavaScript, which cannot be used as names of variables, functions or other objects.

Reserved JavaScript keywords

Current list as of Version 5.1 [1]

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

Words reserved for JavaScript in the future

Current list as of Version 5.1 [2]

• abstract
• boolean
• byte
• char
• class
• const
• double
• enum
• export
• extends
• final
• float
• goto
• implements
• import
• int
• interface
• let
• long
• native
• package
• private
• protected
• public
• short
• static
• super
• synchronized
• throws
• transient
• volatile