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How to get "value" using "key" from json in Javascript / JQuery

I have the following Json line. I want to get the "Value" using "Key", something like

giving 'BtchGotAdjust' returns 'Batch Got Adjusted';

var jsonstring=
[{"Key":"BtchGotAdjust","Value":"Batch Got Adjusted"},{"Key":"UnitToUnit","Value":"Unit To Unit"},]
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3 answers


Wow ... Looks kind of cool! It looks like you need to manipulate it a bit. Instead of functions, we can create a new object like this:

var jsonstring =
    [{"Key":"BtchGotAdjust","Value":"Batch Got Adjusted"},{"Key":"UnitToUnit","Value":"Unit To Unit"},];
     var finalJSON = {};
     for (var i in jsonstring)
         finalJSON[jsonstring[i]["Key"]] = jsonstring[i]["Value"];


You can use it using:

finalJSON["BtchGotAdjust"]; // Batch Got Adjusted
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Since you have an array in your variable, you need to Key

loop over the array and compare with the -Property of each element, something like this:

for (var i = 0; i < jsonstring.length; i++) {
  if (jsonstring[i].Key === 'BtchGotAdjust') {
    console.log(jsonstring[i].Value);
  }
}


By the way, I think your variable name is a jsonstring

little misleading. It does not contain a string. It contains an array. However, the above code should give you a hint in the right direction.

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Personally, I would create a map from an array, and then it acts like a dictionary giving you instant access. You also only need to go through the array once to get all the data you need:

var objectArray = [{"Key":"BtchGotAdjust","Value":"Batch Got Adjusted"},{"Key":"UnitToUnit","Value":"Unit To Unit"}]

var map = {}

for (var i=0; i < objectArray.length; i++){
    map[objectArray[i].Key] = objectArray[i]
}

console.log(map);
alert(map["BtchGotAdjust"].Value)
alert(map["UnitToUnit"].Value)

See the js fiddle here: http://jsfiddle.net/t2vrn1pq/1/

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