How can I delete all objects in a json array by its keyword

Question

I have json like this:

json = [ 
   { 
      "value1":"3863",
      "value2":"4567"
   },
   { 
      "value1":"4456",
      "value2":"87687"
   },
   { 
      "value1":"98494",
      "value2":"4534"
   },   
]

What I need is to delete value2 so the json would look like:

json = [ 
   { 
      "value1":"3863"
   },
   { 
      "value1":"4456"
   },
   { 
      "value1":"98494"
   },   
]

I have tried to use

for(var i = 0; i < json.length; i++)
{    
  delete json["value2"];   
}

but it doesn´t work.

Is there any way of doing that ?

delete json[i]["value2"];. I would prefer const result = json.map(({ value1 }) => ({ value1 })); though. — Shilly
– Shilly, Commented Sep 30, 2019 at 15:20
Thanks everyone, it works fine with both options. json.map and with the one I was trying to use (delete) in which I was missing the index i. — Vec
– Vec, Commented Sep 30, 2019 at 15:30

Abito Prakash · Accepted Answer · 2019-09-30 15:23:12Z

1


const json = [ 
   { 
      "value1":"3863",
      "value2":"4567"
   },
   { 
      "value1":"4456",
      "value2":"87687"
   },
   { 
      "value1":"98494",
      "value2":"4534"
   },   
];

json.forEach(item => delete item.value2);

answered Sep 30, 2019 at 15:23

Abito Prakash

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Comments

random · Accepted Answer · 2019-09-30 15:19:28Z

0

use map.

json = [ 
  { 
     "value1":"3863",
     "value2":"4567"
  },
  { 
     "value1":"4456",
     "value2":"87687"
  },
  { 
     "value1":"98494",
     "value2":"4534"
  }
];

console.log(json.map(({value1}) => ({value1})));

answered Sep 30, 2019 at 15:19

random

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Comments

silencedogood · Accepted Answer · 2019-09-30 15:20:36Z

0

With your current syntax:

for(var i = 0; i < json.length; i++)
{    
  delete json[i].value2;   
}

answered Sep 30, 2019 at 15:20

silencedogood

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Comments

Alex Vovchuk · Accepted Answer · 2019-09-30 15:20:53Z

0

You just have missed i usage in accessing json array elements:

for(var i = 0; i < js.length; i++)
{    
  delete json[i]["value2"];   
}

answered Sep 30, 2019 at 15:20

Alex Vovchuk

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Comments

tom · Accepted Answer · 2019-09-30 15:21:37Z

0

You forgot the iterator i:

delete json[i]["value2"];

var json = [ 
   { 
      "value1":"3863",
      "value2":"4567"
   },
   { 
      "value1":"4456",
      "value2":"87687"
   },
   { 
      "value1":"98494",
      "value2":"4534"
   },   
];

for(var i = 0; i < json.length; i++) {    
  delete json[i]["value2"];   
}

console.log(json);

answered Sep 30, 2019 at 15:21

tom

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