SyntaxError Invalid or unexpected token

This error occurs when the JavaScript code encounters a token that is not valid or unexpected in that context.

Here are some possible causes and solutions for this error:

1. Missing or misplaced brackets, parentheses, or curly braces: Check if you have properly closed all brackets, parentheses, or curly braces in your code.

2. Missing or misplaced semicolons: JavaScript statements should end with a semicolon. Make sure you have added semicolons at the end of each statement.

3. Incorrect use of quotes: Ensure that you use the correct type of quotes (single or double) and that they are properly closed.

4. Misspelled keywords or variables: Check if you have misspelled any keywords or variables in your code.

5. Invalid characters: Make sure that all characters used in your code are valid JavaScript characters.

6. Incorrect use of operators: Check if you have used operators correctly, such as using "=" instead of "==" for comparison.

7. Incorrect use of reserved words: Avoid using reserved words as variable or function names.

8. Incorrect use of template literals: If you are using template literals (enclosed in backticks), ensure that they are properly closed and formatted.

It's important to carefully review your code and identify the specific line or section where the error occurs. This will help you pinpoint the issue and apply the appropriate solution.