Validating String in object

Question

I have following object:

var obj = {
 "id": 1,
 "name": "john",
 "creds": {
   "username": "abc@yopmail.com"   
 },
 "account": {
  "credit": {
   "number": "123456"
  },
  "name": "accountName"
 }
}

How can i dynamically get value:

I want to get the value by passing the hierarchy as string

console.log("Username: ", obj["creds.username"]);
console.log("CreditNumber: ", obj["account.credit.number"]);

Note: the object might have nth deep child objects

Please advise me a dynamic solution for this

i can't understand your question. You want a sort of for loop that gives you creds.username? — illeb, Aug 25 '16 at 09:55
@Luxor001: I want to get the value by passing json hierarchy as string. — maverickosama92, Aug 25 '16 at 09:56
myJson[Creds][username], where Creds = "creds" and username="username" — illeb, Aug 25 '16 at 09:57
You are not using JSON in your code. This is a JavaScript object. JSON is a string representation of an object, array or value. You can get the values from the object using the following: console.log("Username: ", myJson["creds"]["username"]); console.log("CreditNumber: ", myJson["account"]["credit"]["number"]); Or even simpler: console.log("Username: ", myJson.creds.username); console.log("CreditNumber: ", myJson.account.credit.number); — Martin, Aug 25 '16 at 09:59
@Quentin: Thanks man, duplicate marked answer solved my query. Thanks all. — maverickosama92, Aug 25 '16 at 10:01
`function getProp(obj, prop) { return prop.split('.').reduce(function(o, k) { return o && o[k]; }, obj); }; getProp(obj, "account.credit.number")` — Pranav C Balan, Aug 25 '16 at 10:02
you can ues a function to do this,like this function:`function demo(str){ var result = myJson; var arr = str.split("\."); for(var i= 0,item;item=arr[i++];){ result = result[item]; } return result; }` and use this function like this:`demo("creds.username")` — Ying Yi, Aug 25 '16 at 10:05

Harish Kommuri · Answer 1 · 2016-08-25T09:59:06.810

3

If you want to get the value by [] use key as string like, ['account'] or you can use native way obj.key.childKey.

console.log("Username: ", myJson.creds.username);
console.log("CreditNumber: ", myJson.account.credit.number);

or

console.log("Username: ", myJson['crews']['username']);
console.log("CreditNumber: ", myJson['account']['credit']['number']);

edited Aug 25 '16 at 09:59

answered Aug 25 '16 at 09:55

Harish Kommuri

2,825
1
22
28

This is the answer and the way you should go "dynamically" trought an object – illeb Aug 25 '16 at 09:56
I cannot use array notation, the hierarchy could go very deep. – maverickosama92 Aug 25 '16 at 09:58
Ok. You can go with first type. There is another reason for using array notation. – Harish Kommuri Aug 25 '16 at 10:00

score 1 · Answer 2 · answered Aug 25 '16 at 09:55

1

Simply by accessing the value with the dot notation:

console.log("Username: ", myJson.creds.username);
console.log("CreditNumber: ", myJson.account.credit.number);

answered Aug 25 '16 at 09:55

Romain Linsolas

79,475
49
202
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Validating String in object

2 Answers2