Side-by-side comparison of SyntaxError and TypeError — understand the differences, causes, and fixes.
AkousaSyntaxErrorThe JavaScript engine encountered code that does not conform to the language syntax.
The code contains invalid syntax that the JavaScript parser cannot understand. This includes missing brackets, unmatched parentheses, invalid characters, or using language features not supported by the runtime.
Check the error message for the line and column number. Look for missing or extra brackets, parentheses, quotes, or semicolons. Use a linter like ESLint to catch syntax errors before runtime.
TypeErrorA value is not of the expected type. This is the most common JavaScript error, occurring when an operation encounters a value of the wrong type.
You attempted to use a value in a way that is incompatible with its type. Common examples include calling a non-function, accessing properties of null/undefined, or passing the wrong argument type to a built-in method.
Check the variable's actual type using typeof or console.log before the failing operation. Add null/undefined checks. Use optional chaining (?.) for potentially null values. Verify function arguments match expected types.