Null/undefined return in WordPress AJAX request

I am not sure the output you have provided is the correct one but do you notice the ‘0’ character at the end of your string?

{"title":"R=3+","dates":["06\/04\/2014","11\/05\/2014","15\/06\/2014","27\/07\/2014","17\/08\/2014","28\/09\/2014","05\/10\/2014","19\/10\/2014","09\/11\/2014","23\/11\/2014","14\/12\/2014"],"series":[{"data":[[1396738800000,284],[1399762800000,350],[1402786800000,212],[1406415600000,296],[1408230000000,220],[1411858800000,253],[1412463600000,200],[1413673200000,310],[1415491200000,180],[1416700800000,156],[1418515200000,290]],"name":"Bulls"}]}0

That is enough to cause the JSON parser to fail.

Also, don’t use the contentType property like that since you don’t send any JSON, you should remove that line altogether.

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