Search for data in json - javascript

Question

I have a json output as

amt: "10.00"
email: "sam@gmail.com"
merchant_id: "sam"
mobileNo: "9874563210"
orderID: "123456"
passkey: "1234"

Literally Im trying to do this in javascript

if(the json output has the key merchant_id)
{
//do something
}

How is it possible to find if a json output has a key like as I demonstrated above?Is it possible,Or is there any alternate method for it?

possible duplicate of [Checking if an associative array key exists in Javascript](http://stackoverflow.com/questions/1098040/checking-if-an-associative-array-key-exists-in-javascript) — , Dec 27 '13 at 16:06
Is this a multiline string? Or is it a json object? What's the exact format and type of the variable you get your data in? — dkellner, Dec 27 '13 at 16:08
Yep, then it's the easy way, if(x.merchant_id=="whatYouWant") — dkellner, Dec 27 '13 at 16:12
hey no yaar.I want to search if 'merchant_id' exists,not its value.If(json has merchant_id){// } like this — Ajeesh, Dec 27 '13 at 16:13
http://stackoverflow.com/a/1098955/1636522, not the answer you are looking for? — , Jan 01 '14 at 06:57

score 1 · Answer 1 · answered Dec 27 '13 at 16:10

Let's say you have JSON object like this:

var json = {
   amt: "10.00",
   email: "sam@gmail.com",
   merchant_id: "sam",
   mobileNo: "9874563210",
   orderID: "123456",
   passkey: "1234"
}

So now you have to use a loop. E.g.

for(var j in json) { // var j is the key in this loop
   if(j == 'merchant_id') {
      // do something
   }
}

score 0 · Answer 2 · answered Dec 27 '13 at 16:10

0

You can just check the type of of the field.

if (typeof json.property !== 'undefined') {
    //has property
}

answered Dec 27 '13 at 16:10

Mattia Franchetto

349
4
9

Can you specify this with my question,so it wil be more clear – Ajeesh Dec 27 '13 at 16:16
If you have a JSON formatted like this: var json = { amt: "10.00", email: "sam@gmail.com", merchant_id: "sam", mobileNo: "9874563210", orderID: "123456", passkey: "1234" } and you need to check the existance of the orderID field just do: if (typeof json.orderID!== 'undefined') { //has property } – Mattia Franchetto Dec 27 '13 at 20:35

score 0 · Answer 3 · answered Dec 27 '13 at 16:10

0

If this is a multiline string like you wrote it, a simple way is:

if(s.indexOf("\nmerchant_id: \"whatever\"\n")>-1) {
    // ...
}

But you can parse it of course, and that's the elegant way. With a json object, you can just refer to the field with a dot, like "obj.merchant_id".

answered Dec 27 '13 at 16:10

dkellner

8,726
2
49
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Its a json object actually which is parsed – Ajeesh Dec 27 '13 at 16:12
Easy pie then. Use the dot syntax mentioned above. (Also if you're hunting for the key only, not regarding its value, franchetto is right.) – dkellner Dec 27 '13 at 16:13
so how it wil come,like this? I dont want to check the value of the key,but i want to search if this key exists in the object – Ajeesh Dec 27 '13 at 16:15
But I didnt understand his answer any more,can you help? – Ajeesh Dec 27 '13 at 16:16
Check franchetto's answer – dkellner Dec 27 '13 at 16:37

score 0 · Answer 4 · answered Dec 27 '13 at 16:13

0

For example, try this:

var data = {
   amt: "10.00",
   email: "sam@gmail.com",
   merchant_id: "sam",
   mobileNo: "9874563210",
   orderID: "123456",
   passkey: "1234"
}

if(data.amt == 'something'){
   // do work
}

answered Dec 27 '13 at 16:13

Ringo

3,795
3
22
37

Search for data in json - javascript

4 Answers4