Manipulate this json string into this javascript object

Question

I have this json string.

user_json_str = 
"
[{
    "id": 1,
    "lg_name": "foo",
    "lg_password": "bar"
},
{
    "id": 2,
    "lg_name": "user",
    "lg_password": "passwd"
}
]
";

I would like to manipulate it such that it becomes a javascript object that looks like this;

user_obj =
{
     foo: {
         id: 1,
         password: 'bar'
     },
     user: {
         id: 2,
         password: 'passwd'
     }
};

I am using node.js v4.6. I am at a loss how to begin. Some hints as starting points would be helpful.

Nina Scholz · Accepted Answer · 2016-10-14 08:49:00Z

4

You could parse the string and build an object with names as key.

var user_json_str = '[{"id":1,"lg_name":"foo","lg_password": "bar"},{"id":2,"lg_name": "user","lg_password":"passwd"}]',
    array = JSON.parse(user_json_str),
    object = {};

array.forEach(function (a) {
    object[a.lg_name] = { id: a.id, password: a.lg_password };
});

console.log(object);

.as-console-wrapper { max-height: 100% !important; top: 0; }

edited Oct 14, 2016 at 8:49

answered Oct 14, 2016 at 8:27

Nina Scholz

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Comments

Community · Accepted Answer · 2020-06-20 09:12:55Z

2

You can use JSON.parse, to get array of object from string.

Then, you can use array.reduce to loop over object and parse into necessary format.

Sample

var user_json_str = '[{"id":1,"lg_name":"foo","lg_password": "bar"},{"id":2,"lg_name": "user","lg_password":"passwd"}]';

var object = JSON.parse(user_json_str).reduce(function (p,o) {
    p[o.lg_name] = { id: o.id, password: o.lg_password };
  return p;
}, {});

console.log(object);

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Oct 14, 2016 at 8:34

Rajesh Dixit

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Comments

Howzieky · Accepted Answer · 2016-10-14 08:30:47Z

1

First, parse your array, create a new object, then loop through the array and build the object.

var arr = JSON.parse('[{"id": 1,"lg_name": "foo","lg_password": "bar"},{"id": 2,"lg_name": "user","lg_password": "passwd"}]');
var newObj = {}
for (var i = 0; i < arr.length; i++)
{
    newObj[arr[i].lg_name] = {id: arr[i].id, password: arr[i].lg_password}
}

answered Oct 14, 2016 at 8:30

Howzieky

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Comments

Oliver Moolman · Accepted Answer · 2016-10-14 08:26:24Z

0

Try using JSON.parse(user_json_str);

answered Oct 14, 2016 at 8:26

Oliver Moolman

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