Search JSON for a specific key and return that data

Question

I am have JSON object that looks like this,

Object {doors: Array[3], baseboards: Array[6], casings: Array[3], crown_mouldings: Array[1], panel_mouldings: Array[1]…}
    architraves: Array[1]
    baseboards: Array[6]
    casings: Array[3]
    chair_rails: Array[1]
    crown_mouldings: Array[1]
    doors: Array[3]
    panel_mouldings: Array[1]
    roofs: Array[8]

What I am wanting to know is I how can just get a certain section of the JSON object. Know obvioulsy I could do something like,

console.log(JSON.roofs) to return the roofs data. My query comes from not knowing what exactly the user will be requesting at anyone time, all I get back from the system is a string of tex, that could be any one of the keys.

Is there a way to search for a key in a JSON object and return that specific data if found?

I have tried this....

getData: function(obj, product) {
        console.log(obj);
        var a = obj;
        var index = 0;
        var found;
        var entry;
        for(index = 0; index < Object.keys(a).length; ++index) {
            console.log(index);
            console.log(a[1]);
            entry = a[index];
            console.log(entry);
        }
    },

The parameters of the above function obj = the json, product equals the string name of the key I am looking for. I get nothing returned. What is the best way to go about this?

Thanks!

If `index` were the property name string, not a number, it would work — Bergi, Dec 05 '13 at 13:43
like @itcouldevenbeaboat answer below you simply use `obj[product]` / `obj.product` to get data array if you are not looking any further data search in an array. — Mithlesh Kumar, Dec 05 '13 at 14:03
My answer below searches the object first and then returns if valid. The accepted answer will throw an error if the key doesn't exist. — iambriansreed, Dec 06 '13 at 18:04

score 0 · Accepted Answer · answered Dec 05 '13 at 13:42

0

Use square bracket notation.

var userEnteredKey = "crown_mouldings";
var data = obj[userEnteredKey];
// Array[1]

answered Dec 05 '13 at 13:42

Code Whisperer

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iambriansreed · Answer 2 · 2013-12-06T18:04:19.157

0

Use the in operator to determine if the object has that key.

var key = 'doors';

if( key in obj )
{
    console.log( "The value assigned to the key '" + key + "' is:");
    console.log( obj[key] );
}
else
{
    console.log( "The key '" + key + "' is not in obj." );
}

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/in

edited Dec 06 '13 at 18:04

answered Dec 05 '13 at 13:46

iambriansreed

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Search JSON for a specific key and return that data

2 Answers2