What are JavaScript Identifiers?

JavaScript Identifiers are names given to variables, functions, etc. It is the same as identifiers in other programming languages like C, C++, Java, etc. Let’s see identifiers for variable names.

The following are legal variable names −


While naming your variables in JavaScript, keep the following rules in mind.

  • You should not use any of the JavaScript reserved keywords as a variable name. These keywords are mentioned in the next section. For example, break or boolean variable names are not valid.
  • JavaScript variable names should not start with a numeral (0-9). They must begin with a letter or an underscore character. For example, 5demo is an invalid variable name but _5demo is a valid one.
  • JavaScript variable names are case-sensitive. For example, Name and name are two different variables.

Updated on: 23-Jun-2020

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