json - See if key exists in nested array

Question

I feel like this is really simple, but how would I check to see if month exists in my jSON data. Using .hasOwnProperty doesn't seem to be working for me. I feel like I'm missing something simple here. All it does is always default to the else clause even though month is clearly in my JSON.

JS Fiddle: http://jsfiddle.net/8y7rJ/1/

var data={"users":[
{
    name:"Ray",        
    phone:"999-999-9999",
    birthday: {
        month:"January",
        day:12,
        year:2012
    }
},
{
    name:"Joe",        
    phone:"111-999-9999",
    birthday: {
        year:1992
    }
},
{
    name:"James",        
    phone:"111-111-1111",
    birthday: {            
        year:2012
    }
}
]}

if(data.users[0].hasOwnProperty("month")){
    alert('month exists');
} else {
    alert('month does not exist');
}

Code samples are appreciated.

data.users[0] doesn't have a property month. data.users[0].birthday does. — user1864610
– user1864610, Commented Aug 5, 2014 at 1:52

Matt Browne · Accepted Answer · 2014-08-05 01:53:05Z

4

month is a property inside of birthday, so you need to do something like this:

if (data.users[0].birthday.month){
    alert('month exists');
} else {
    alert('month does not exist');
}

Note that if you're not sure whether birthday will always be present, you should do this instead:

if (data.users[0].birthday && data.users[0].birthday.month){
    alert('month exists');
} else {
    alert('month does not exist');
}

answered Aug 5, 2014 at 1:53

Matt Browne

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