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.

Answer 1

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; } 

Answer 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); 

Answer 3

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}
}

Answer 4

尝试使用JSON.parse（user_json_str）;