Test json property exists

[Marc Jacobi]

I am looking for a way to check if a json property exists. As an alternative I could also work with a list of key-value pairs of a json object.

"items" : [

  "item" : {

    "prop1": "foo",

    "prop2": "bar"

  },

  "item" : {

    "prop1": "foo",

    "prop2": "bar",

    "prop3": "foobar"

  }

  "item" : {

    "prop1": "foo"

  }

]

I need to be able to process the 'item' objects and conditionally output based on the existence of a 'prop' field...