Question

I need to parse data from one JSON file in order to validate arrays, keys, and values in a second JSON file. For example, I have a JSON file filled with data in this format:

{ "someData":["array", "key", "value"] }

I have a second JSON file with data like this:

{ "fruit": [ {"type":"apple"}, 
             {"type":"cherry"},
             {"type":"pear"} ] }

What I need to do is take the data from the first JSON file and use it to validate data in the second JSON file. Say my “someData” JSON looks like this:

{ "someData":["fruit", "type", "pear"] }

How can I create a straight javascript function to determine if the “fruit” array exists in the second JSON dictionary, with a key named “type”, and a value named “pear”? I guess what I’m really asking is how do I use a string from the first JSON dictionary in order to access data from the second JSON dictionary?

Answer 1

You can acces a property of an object either directly or if dynamically via dictionary notation (if you have its name as string):

var j2 = { "fruit": [ {"type":"apple"}, 
             {"type":"cherry"},
             {"type":"pear"} ] };

j2.fruit[0].type = j2["fruit"][0]["type"] = "apple"