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JS
JavaScript error

SyntaxError

The JavaScript exception "unlabeled break must be inside loop or switch" occurs when a break statement is not inside a loop or a switch statement.

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: Illegal break statement (V8-based)
As listed by MDN Web Docs
SyntaxError: unlabeled break must be inside loop or switch (Firefox)
As listed by MDN Web Docs
SyntaxError: 'break' is only valid inside a switch or loop statement. (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 2026-09-25T01:48:37.272Z.