how to get value in json in Node.js

Question

get response in function node.js

[
  {
    instrument_token: '12598786',
    exchange_token: '49214',
    tradingsymbol: 'AARTIIND21JAN1000CE',
    name: 'AARTIIND'   
  },
  {
    instrument_token: '12599810',
    exchange_token: '49218',
    tradingsymbol: 'AARTIIND21JAN1000PE',
    name: 'AARTIIND'
  }
]

How to get only instrument_token in another variable in node

const ObjData = JSON.stringify(response);
console.log(ObjData.instrument_token);

Result : undefined

I don't understand your question, can you clarify please, what exactly are you going to do with the array of objects ? — Max, Jan 22 '21 at 11:07
Does this answer your question? [How to loop through an array containing objects and access their properties](https://stackoverflow.com/questions/16626735/how-to-loop-through-an-array-containing-objects-and-access-their-properties) — Hobbamok, Jan 22 '21 at 11:21

Hobbamok · Answer 1 · 2021-01-22T11:22:35.740

0

This isn't relevant to NodeJS because thats not a language. You want to ask for Javascript.

Since you don't have a JSON OBject, but instead an ARRAY of those, so you need to iterate over the array in a loop, and in it simply go = object.instrument_token

const yourDataArray = [];
function extractData(thatThingYouGetReturnedThere){
  for (let obj of thatThingYouGetReturnedThere){
    yourDataArray.push(obj.instrument_token)
  }
}

That way, after calling the function with your array, you have all the data you want stored as an array in yourDataArray

edited Jan 22 '21 at 11:22

answered Jan 22 '21 at 11:08

Hobbamok

767
1
11
21

how ..give me example demo – Devender Jangra Jan 22 '21 at 11:11
@DevenderJangra there it is. I didn't want to give you the solution since you don't even know what you're asking. Your question contains TWO values with the name that you want to have yet you say as if there only was one – Hobbamok Jan 22 '21 at 11:15
but obj.instrument_token undefined.how posible – Devender Jangra Jan 22 '21 at 11:19
fixed it. Also flagged your question as the duplicate that it is – Hobbamok Jan 22 '21 at 11:22
https://stackoverflow.com/questions/16626735/how-to-loop-through-an-array-containing-objects-and-access-their-properties here, that's where proper answers are. – Hobbamok Jan 22 '21 at 11:23

score 0 · Answer 2 · edited Jan 22 '21 at 11:34

OK so I think I follow your question.

Lets do this by example. If I have a variable foo which is an array of JSON objects:

let foo = [ 
            {
              instrument_token: '12598786',
              exchange_token: '49214',
              tradingsymbol: 'AARTIIND21JAN1000CE',
              name: 'AARTIIND'   
            },
            {
              instrument_token: '12599810',
              exchange_token: '49218',
              tradingsymbol: 'AARTIIND21JAN1000PE',
              name: 'AARTIIND'
            }
          ]

To get any individual key-value object pair out I need to specify the array number I want to access. So to get instrument_token from the first object I would do:

let bar = foo[0];                              // Now bar contains the first JSON object
let myInstrumentToken = bar.instrument_token;  // Instrument token from the first object

Similarly if I want the name from the second object I would do:

let bar = foo[1];       // Now bar contains the second JSON object of the array
let myName = bar.name;  // Name from the second object

score 0 · Answer 3 · answered Jan 22 '21 at 13:06

const data = [
  {
    instrument_token: '12598786',
    exchange_token: '49214',
    tradingsymbol: 'AARTIIND21JAN1000CE',
    name: 'AARTIIND'   
  },
  {
    instrument_token: '12599810',
    exchange_token: '49218',
    tradingsymbol: 'AARTIIND21JAN1000PE',
    name: 'AARTIIND'
  }
];
let tokenArray =[];
for (let obj of data){
    tokenArray.push(obj.instrument_token)
  }
console.log(tokenArray);  
//It will give you [ '12598786', '12599810' ]  
Hope this is what you want

score 0 · Answer 4 · answered Nov 13 '22 at 10:47

if you have :

response = [
  {
    instrument_token: '12598786',
    exchange_token: '49214',
    tradingsymbol: 'AARTIIND21JAN1000CE',
    name: 'AARTIIND'   
  },
  {
    instrument_token: '12599810',
    exchange_token: '49218',
    tradingsymbol: 'AARTIIND21JAN1000PE',
    name: 'AARTIIND'
  }
]

you can do this:

response.map(x => x = {instrument_token: x.instrument_token})

/* 
 #### output : 
[
{ instrument_token: "12598786" }, 
{ instrument_token: "12599810" } 
]
*/

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how to get value in json in Node.js

4 Answers4