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JS
JavaScript error

SyntaxError

The JavaScript exception "missing variable name" is a common error. It is usually caused by omitting a variable name or a typographic error.

Reference entryJavaScriptFetched
This is a reference entry from MDN Web Docs. A full explanation with fixes has not been written yet.

The error messages

SyntaxError: missing variable name (Firefox)
As listed by MDN Web Docs
SyntaxError: Unexpected token '='. Expected a parameter pattern or a ')' in parameter list. (Safari)
As listed by MDN Web Docs

Details

Category
SyntaxError
Severity
error
Runtime
both

Related errors

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Source: MDN Web Docs. Data fetched 2026-09-25T01:48:37.274Z.