I am pretty sure JSON requires an object/array wrapper. A nude Javascript string is not valid JSON.
perl -MJSON::XS -le 'decode_json(q{\u003cdiv class=\"ja-job-details...
+})'
malformed JSON string, neither tag, array, object, number, string or a
+tom, at character offset 0 (before "\\u003cdiv class=\\"...") at -e l
+ine 1.