How to get values in a JSON array object [duplicate]

Question

I am new to javascript usage. I have a requirement of below JSON object message.

{
  "Rep": {
    "out": [
      {
        "first": "abc",
        "second": "fd",
        "state": "none",
        "badge": "NON",
        "res": 0
      },
      {
        "first": "xyz",
        "second": "5f7209",
        "state": 15,
        "badge": "OH",
        "res": 0
      },
      {
        "first": "def",
        "second": "b5fd",
        "badge": "Pen",
        "state": 3,
        "res": 0
      },
      {
        "first": "aa",
        "second": "5e",
        "badge": "Com",
        "state": 1,
        "res": 0
      }
    ]
  }
}

The requirement is I have to traverse and take 'first' key tag value from the object and check whether the value equals to some value(here it is "first" == 'aa'). if exists I have to take the value of 'badge' from the corresponding object.

Example - From the message

1)I have to check if "first == aa" exists, then I should check in the object 'res' value if it is 0,then take the value of badge, here it is "com".

2)I have to check if "first == def" exists, then I should check in the object 'res' value if it is 0,then take the value of badge, here it is "Pen".

In the similar way I have to go through each block and check "first" key value and then take corresponding badge value.

Note : We will not be not sure on how many object blocks will come in array.

Not sure what the problem is.... sounds like you need a loop — epascarello
– epascarello, Commented Mar 18, 2021 at 2:29
use array filter for this. For example let result = array['Rep']['out'].filter((v) => v.first === 'abc'); if( result.length) console.log( result[0].badge ); — Tamil Selvan C
– Tamil Selvan C, Commented Mar 18, 2021 at 2:38
You are missing double quote at this position "second": "5e, — Raeesh Alam
– Raeesh Alam, Commented Mar 18, 2021 at 3:59

AshkarMHM · Accepted Answer · 2021-03-18 02:42:30Z

object={
  "Rep": {
    "out": [
      {
        "first": "abc",
        "second": "fd",
        "state": "none",
        "badge": "NON",
        "res": 0
      },
      {
        "first": "xyz",
        "second": "5f7209",
        "state": 15,
        "badge": "OH",
        "res": 0
      },
      {
        "first": "def",
        "second": "b5fd",
        "badge": "Pen",
        "state": 3,
        "res": 0
      },
      {
        "first": "aa",
        "second": "5e",
        "badge": "Com",
        "state": 1,
        "res": 0
      }
    ]
  }
}

in_list=object.Rep.out
in_list.forEach((arr)=>{
  if (arr.first=="def"){
    console.log(arr.badge);
  }
});

You can read values in JSON by JSON.Key and You can loop over Array using forEach() . Then you can use conditions to get related badge value. Hope this will be helpful !!

Luis Danilo · Accepted Answer · 2021-03-18 02:47:11Z

suppose you have your json message stored in a variable called jsonMessage like this:

const jsonMessage = {
  "Rep": {
    "out": [
      {
        "first": "abc",
        "second": "fd",
        "state": "none",
        "badge": "NON",
        "res": 0
      },
      {
        "first": "xyz",
        "second": "5f7209",
        "state": 15,
        "badge": "OH",
        "res": 0
      },
      {
        "first": "def",
        "second": "b5fd",
        "badge": "Pen",
        "state": 3,
        "res": 0
      },
      {
        "first": "aa",
        "second": "5e",
        "badge": "Com",
        "state": 1,
        "res": 0
      }
    ]
  }
}

// Now you can refers "out" array directly, its called destructuring (google it, its pretty usefull)
const { Rep: { out } } = jsonMessage

// Filter objects that fulfill conditions
const validObjects = out.filter( obj => {
    return (obj.first === "aa" && obj.res === 0) || (obj.first === "def" && obj.res === 0)
})

// Now you have an array with valid objects, for each object in array you can recover badge value
validObjects.forEach( obj => {
    console.log(obj.badge)
})

Raeesh Alam · Accepted Answer · 2021-03-18 03:57:45Z

You can use map() method to play with condition for which you want.

const jsonMessage = {
    "Rep": {
        "out": [
        {
            "first": "abc",
            "second": "fd",
            "state": "none",
            "badge": "NON",
            "res": 0
        },
        {
            "first": "xyz",
            "second": "5f7209",
            "state": 15,
            "badge": "OH",
            "res": 0
        },
        {
            "first": "def",
            "second": "b5fd",
            "badge": "Pen",
            "state": 3,
            "res": 0
        },
        {
            "first": "aa",
            "second": "5e",
            "badge": "Com",
            "state": 1,
            "res": 0
        }]
    }
}

jsonMessage.Rep.out.map(function(params) {
    if((params.first=="aa" && params.res ==0) || (params.first === "def" && params.res == 0)) {
        console.log(params.badge);
    } 
});

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