How to extract key values from json message assigned to a string object

Question

I am converting XML message with attributes to JSON and assigning to a variable. Now variable x has the converted JSON message. Now I want to extract the key value pairs from that variable x(string) .

Please check the below details. XML Message is

<?xml version="1.0" encoding="UTF-8"?>
<OBJECT key="postorder" type="TEMP">
    <TEMP>
        <ROW order-version-id="1" 
             layout-type="2" 
             order-no="3" 
             order-action="4" 
             estimated-price="5" 
             orig-price="6" 
             quantity="7" 
             orig-quantity="8" 
             quantity-type="6" 
             trade-currency="7" 
             base-currency="8" 
             settlement-currency="9"/>
    </TEMP>
</OBJECT> 

and I am converting it using fast-xml-parser and the output is as below

{
   "OBJECT":{
      "key":"postorder",
      "type":"TEMP",
      "TEMP":{
         "ROW":{
            "order-version-id":"1",
            "layout-type":"2",
            "order-no":"3",
            "order-action":"4",
            "estimated-price":"5",
            "orig-price":"6",
            "quantity":"7",
            "orig-quantity":"8",
            "quantity-type":"6",
            "trade-currency":"7",
            "base-currency":"8",
            "settlement-currency":"9"
         }
      }
   }
}

and assigning it as var result = JSON.stringify(jsonObj); now result of string type has the converted JSON message. From result, I need to get base-currency values

Any leads are appreciated.

Answer 1

Without further examples, I'm not sure if this is what you actually want, but as I understand:

You have this:

let x = '{k1: v1, k2: v2, k3: v3....}'

And you want to have this:

let object = {k1: v1, k2: v2,...}

The fastest way to do this would be using JSON.parse functionality:

let x = '{k1: v1, k2: v2, k3: v3....}';
let object = JSON.parse(x);

---

EDIT: In your specific example, you don't need to use JSON.stringify. You already have a JSON object, o access it like this:

let object = /*that parsed XML*/
let baseCurrency = object.OBJECT.TEMP.ROW['base-currency']; //this will give you the value as string

Answer 2

You can use JSON.parse function to convert the string to JSON object.

Hope the below example would help you get started.

 const x = '{"key1":"value1","key2":"value2"}'; const json = JSON.parse(x); console.log(json.key1); console.log(json.key2);

Updates (based on changes in question)

The result you get from the fast-xml-parser is a JSON object. You need not convert it into a string using JSON.stringify . You can use that object directly and get the base-currency value.

See the code below.

 const jsonObj = { "OBJECT": { "key": "postorder", "type": "TEMP", "TEMP": { "ROW": { "order-version-id": "1", "layout-type": "2", "order-no": "3", "order-action": "4", "estimated-price": "5", "orig-price": "6", "quantity": "7", "orig-quantity": "8", "quantity-type": "6", "trade-currency": "7", "base-currency": "8", "settlement-currency": "9" } } } }; const baseCurrency = jsonObj.OBJECT.TEMP.ROW["base-currency"]; console.log(baseCurrency); // 8

Answer 3

First use JSON.parse function to convert the string to JSON object.

const object1 =JSON.parse(jsonstr) ;
console.log(Object.keys(object1));

The Object.keys() method returns an array of a given object's own property names, in the same order as we get with a normal loop.