CODEWITHSUNDEEP
javascriptjson
jennifercryt
jennifercryt

Reputation: 25

How to add an ID for each object inside JSON array in JavaScript?

There are many objects in the JSON file that look like I have shown below. I want to give an index number starting from 0 for each of these objects. How can I do it?

[
  {
    "language": "Python",
    "created": "2018-8-27 14:50:31",
    "evaluated": true,
    "hiddenCode": false
  },
  ...
]

Upvotes: 0

Views: 3884

Answers (3)

Iurii Tkachenko
Iurii Tkachenko

Reputation: 3189

You can use Array.prototype.map() (MDN) to get new, indexed, array.

var array = [{
  "language": "Python1",
  "created": "2018-8-27 14:50:31",
  "evaluated": true,
  "hiddenCode": false
}, {
  "language": "Python2",
  "created": "2018-8-27 14:50:31",
  "evaluated": true,
  "hiddenCode": false
}]

const indexed = array.map((item, index) => Object.assign(item, { index }))

console.log(indexed)

Upvotes: 2

Dinosan0908
Dinosan0908

Reputation: 1102

Probably something like this if you use ES,

You should use map to iterate over your objects and add the property in it

var yourObjects =[   {
        "language": "Python1",
        "created": "2018-8-27 14:50:31",
        "evaluated": true,
        "hiddenCode": false
    },  {
        "language": "Python2",
        "created": "2018-8-27 14:50:31",
        "evaluated": true,
        "hiddenCode": false
    }
];

var i = 0;    
 yourObjects.map(
     (obj) => {
          obj['index'] = i;
          i++
          return obj;
     });
console.log(yourObjects);

Upvotes: 0

Manasi
Manasi

Reputation: 765

You can loop on the objects and add new property,

var array =[   {
        "language": "Python1",
        "created": "2018-8-27 14:50:31",
        "evaluated": true,
        "hiddenCode": false
    },  {
        "language": "Python2",
        "created": "2018-8-27 14:50:31",
        "evaluated": true,
        "hiddenCode": false
    }
];
for (i = 0; i < array.length; i++) { 
 array[i]["index "] =i;
}
console.log(array);

Upvotes: 1

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