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How to use JS Variable Name Validator

Type or paste a variable name, then click Validate. You get a valid / invalid verdict plus a list of exactly what is wrong.

Frequently asked questions

What makes a name valid?

It must start with a letter, $ or _, contain only letters, digits, $ or _, be non-empty, and must not be a reserved JavaScript keyword.

Which words are reserved?

Keywords like class, return, let, function, new and future-reserved words such as enum and implements cannot be used as identifiers.

Does it allow Unicode names?

JavaScript permits some Unicode identifiers, but this validator checks the standard ASCII rules and will flag non-ASCII characters as invalid for portability.

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