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How to Resolve \"Uncaught SyntaxError: Unexpected token :\" in MooTools Scripts with HTML Response Bodies?
Published on 2024-11-06
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Investigating "Uncaught SyntaxError: Unexpected token :" in MooTools Script
In MooTools scripts, an "Uncaught SyntaxError: Unexpected token :" error in Chrome may arise when trying to parse JSON returned from an AJAX call. However, examining the JSON in the console often fails to reveal any apparent issues.
One potential cause for this error is the presence of HTML in the response body. This can manifest as a red error in the Chrome developer console, indicating an unexpected token "
Behind this error, the browser's reaction to the first line of the server's response is at play. If the initial line is "", it signifies the presence of HTML in the response body, which can disrupt the JSON parsing process.
To resolve this issue, ensure that the server is correctly returning pure JSON data, free of any HTML or other extraneous content. By ensuring proper data handling by the server, you can eliminate the unexpected token error and allow the MooTools script to function as intended.
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