Converting array to JSON to check the values

Question

I send an Ajax call to a PHP file, Then an array is returned.

I want to check the values of the returned data.

Here is the Javascript/jQuery code:

$.ajax({
    url: "file.php",
    type: "POST",
    data: {'num': 12},
    dataType : "json",
    success: function(data){
        JSON.parse(data);
        console.log(data.status);
    }
});

PHP code:

$status = 1;
$msg = 'Test message';
$response = array($status, $msg);
echo json_encode($response);

But I'm getting an error JSON.parse: unexpected non-whitespace character

Remove JSON.parse(data) from your JS code. jQuery will already have deserialised it for you — Rory McCrossan
– Rory McCrossan, Commented Oct 31, 2019 at 14:02
@RoryMcCrossan It was an incorrect bit of PHP creating the response. Fixed it in my answer after the OP pointed it out — RiggsFolly
– RiggsFolly, Commented Oct 31, 2019 at 14:20

RiggsFolly · Accepted Answer · 2019-10-31 14:17:20Z

4

You used dataType : "json", in the AJAX parameter list, which tells jQuery to expect JSON and do the Parse internally for you.

So remove the JSON.parse(data); and all should be well

You will also have to change the PHP to make the returned data appear in the right place like this

$response = array('status' => $status, 'message' => $msg);

edited Oct 31, 2019 at 14:17

answered Oct 31, 2019 at 14:03

RiggsFolly

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2 Comments

User1804 Over a year ago

But console.log(data.status); returns undefined

RiggsFolly Over a year ago

See amended response from the PHP

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