Question: How in the world is the error saying "#Uncaught #SyntaxError: "[object Object]" is not valid #JSON".
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Answer: Take a look at the data coming from the Server, the way you do this is by logging the response from the server to the #Console in the Developer Tools.
1. Determin whether the data is as expected, the reason why the error might be thrown is because the response is not #Json.
Let me know in the comments below if this helped you.