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Syntax errors

Browse documented syntax errors, error messages, troubleshooting explanations, and fixes across products, tools, and platforms.

These pages help users compare related error messages, common causes, and how-to-fix steps across different tools that fail in the same way.

Syntax errors are often searched as exact messages or short problem phrases, so this hub is designed to work as both a documentation browse surface and a search landing area.

The pages in this category focus on what the error means, what usually causes it, and which checks help narrow the issue fastest across different products and platforms.

JavaScript
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SyntaxError: missing ) after argument list
JavaScript call or expression is missing a closing parenthesisJavaScript
SyntaxError: missing = in const declaration
JavaScript const declaration is missing an initializerJavaScript
SyntaxError: duplicate formal argument
JavaScript function declared the same parameter twiceJavaScript
SyntaxError: Unexpected token
JavaScript parser hit an unexpected tokenJavaScript
SyntaxError: return not in function
JavaScript return statement is outside a functionJavaScript
SyntaxError: string literal contains an unescaped line break
JavaScript string literal contains an unescaped line breakJavaScript
SyntaxError: invalid assignment left-hand side
JavaScript tried to assign to something that is not assignableJavaScript
SyntaxError: await is only valid in async functions, async generators and modules
JavaScript used await outside a valid async contextJavaScript
Syntax Errors | Error Atlas