Uncaught SyntaxError: Unexpected token : valid JSON

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Unexpected token colon JSON after jQuery.ajax#get 2 answers

json Uncaught SyntaxError: Unexpected token : 4 answers

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To solve the error

No 'Access-Control-Allow-Origin' header is present on the requested resource.

you should add some codes in your server . Java version:

protected void doPost(HttpServletRequest request,
        HttpServletResponse response) throws ServletException, IOException {

    // ...
    response.addHeader("Access-Control-Allow-Origin", "*");
    // you can change * for your spec url. 
    // if * is used, any url can be access to the data.

    // ...
}

and you can use dataType: 'json'

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