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POJQuery gives JSON syntax error when using PHP's json_encode
 

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  1. POJQuery gives JSON syntax error when using PHP's json_encode
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    <p>I have an application that uses JQuery $.ajax to send JSON encoded data to server where I process it and then send back the results also JSON encoded. The problem is that JQuery gives a parse error when I want to process the response. (As if PHP's json_encode function outputs an invalid JSON format). Here comes the code:</p> <p>The Javascript code:</p> <pre><code>$.ajax({ type: 'POST', url: URL+'pages/processListUIAjaxRequest', data:{filters: filters, rebuild_params: $('#rebuild_params\\['+unique+'\\]').val()}, dataType: 'json', success: function(response){ alert(response); }, error: function(request, status, error){ alert('Unable to update table contents'); console.log(request); console.log(status); console.log(error); } }); </code></pre> <p>This is a piece of the PHP code which outputs the response:</p> <pre><code>$response-&gt;addResult($uFilters); header('Content-Type: application/json'); $response-&gt;toJSON(true); </code></pre> <p>The $uFilters is a simple array, and the toJSON method of the $response object is here:</p> <pre><code>public function toJSON($output = false){ $out = array(); if($this-&gt;hasErrors()){ $out['has_error'] = true; $out['errors'] = $this-&gt;getErrors(); } else $out['has_error'] = false; $out['result'] = $this-&gt;_result; if($output){ echo json_encode($out); }else{ return json_encode($out); } }// toJSON </code></pre> <p>Every time I run the code i get the 'Unable to update table contents', and on JavaScript console I have:</p> <blockquote> <p>'SyntaxError: JSON.parse: unexpected character'</p> </blockquote> <p>despite I defined dataType: as 'json' and the output is json_encode'd by PHP. On the JavaScript console I can see that the response text is:</p> <pre><code>"{"has_error":false,"result":{"page_id":"xxx"}}" </code></pre> <p>Tried copy this and validate with online JSON validator tools, the interesting thing is it was valid a few times and it was invalid a few times (without any consistency) Im a bit confused. Tried to use other headers like:</p> <pre><code>header('Content-Type: text/json'); header('Content-Type:javascript/json'); header('Content-Type: application/json'); </code></pre> <p>or with no header, but nothing.</p> <p>If I edit the JQuery ajax request's dataType to 'text' (despite the output is JSON formatted and and even the header says it is a JSON content), then the success handler runs and I got the response correctly. In this case the same problem comes when I try to $.parseJSON(response).</p> <p>What went wrong? Is my JSON string really invalid?</p>
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    1. COIs it possible that you have a space before the json-content begins?
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    2. CO@OptimusCrime, yes good thought, although actually it was a BOM character.
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