How to Resolve \'Unexpected token :\' SyntaxError with AJAX in Chrome Using MooTools-JS Tutorial-php.cn

How to Resolve \'Unexpected token :\' SyntaxError with AJAX in Chrome Using MooTools

Barbara Streisand

Release： 2024-10-23 12:59:01

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How to Resolve

Unveiling the Cause of "Unexpected token :" SyntaxError

When encountering the frustrating "Uncaught SyntaxError: Unexpected token :" error in Chrome while using AJAX in MooTools, it's natural to feel bewildered. Determining the root cause can be challenging, especially when commenting out code doesn't yield results.

Upon examining the returned JSON in the console, it might appear flawless:

<code class="JSON">{"votes":47,"totalvotes":90}</code>

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However, a deeper analysis reveals that Chrome encounters a different issue. The unexpected top line in the response body is causing the error:

<code class="HTML"><!DOCTYPE html></code>

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This HTML declaration is causing Chrome to interpret the response as an HTML document rather than JSON. This mismatch leads to the "Unexpected token :" error.

Solution:

To resolve this issue, ensure that the server is correctly configured to return the JSON data without any additional HTML markup. This will allow Chrome to parse the response correctly as JSON and avoid the SyntaxError.

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