Converting json object to an array

Question

How can I convert the below using lodash or javascript :

 [
  {
    "roleId": "1",
    "name": "Superadmin"
    "permissions": [
      {
        "permissionId": "1",
        "action": "Remove"
      }
    ]
  },
  "id": "2",
  "name": "Administrator",
  "permissions": [
    {
      "permissionId": "1",
      "action": "Remove"
    },
    {
      "permissionId": "2",
      "action": "Create"
    },
    {
      "permissionId": "3",
      "action": "Read"
    }
  ]
]

To this:

{
   Superadmin: ['Remove'],
   Administrator: ['Remove', 'Create', 'Read']
}

Have you tried anything that we can help you fix, rather than implementing this specification from scratch for free? — James Thorpe
– James Thorpe, Commented Apr 20, 2016 at 12:51
This is valid: [ { "roleId": "1", "name": "Superadmin", "permissions": [ { "permissionId": "1", "action": "Remove" } ] }, { "id": "2", "name": "Administrator", "permissions": [ { "permissionId": "1", "action": "Remove" }, { "permissionId": "2", "action": "Create" }, { "permissionId": "3", "action": "Read" } ] } ] — mplungjan
– mplungjan, Commented Apr 20, 2016 at 12:56
One of these 10000 similar questions might help, e.g., JSON to javaScript array — Yogi
– Yogi, Commented Apr 20, 2016 at 13:05

Nina Scholz · Accepted Answer · 2016-04-20 13:04:56Z

3

A proposal with Array#forEach and Array#map.

var array = [{ "roleId": "1", "name": "Superadmin", "permissions": [{ "permissionId": "1", "action": "Remove" }] }, { "id": "2", "name": "Administrator", "permissions": [{ "permissionId": "1", "action": "Remove" }, { "permissionId": "2", "action": "Create" }, { "permissionId": "3", "action": "Read" }] }],
    object = {};

array.forEach(function (a) {
    object[a.name] = a.permissions.map(function (b) {
        return b.action;
    });
});

document.write('<pre>' + JSON.stringify(object, 0, 4) + '</pre>');

answered Apr 20, 2016 at 13:04

Nina Scholz

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Comments

Jagdish Idhate · Accepted Answer · 2016-04-20 13:05:35Z

2

You can use reduce & map

var temp =  [{
    "roleId": "1",
    "name": "Superadmin",
    "permissions": [{
        "permissionId": "1",
        "action": "Remove"
    }]
 }, {
    "id": "2",
    "name": "Administrator",
    "permissions": [{
        "permissionId": "1",
        "action": "Remove"
    }, {
        "permissionId": "2",
        "action": "Create"
    }, {
        "permissionId": "3",
        "action": "Read"
    }]
 }]

temp.reduce((result,obj)=>{
  result[obj.name] = obj.permissions.map(x=>x.action)
  return result;
},{});

answered Apr 20, 2016 at 13:05

Jagdish Idhate

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Comments

Thalaivar · Accepted Answer · 2016-04-20 13:09:35Z

2

seeing the formatted and valid json from comments, here is something which you can use.

var arr = [{
    "roleId": "1",
    "name": "Superadmin",
    "permissions": [{
        "permissionId": "1",
        "action": "Remove"
    }]
}, {
    "id": "2",
    "name": "Administrator",
    "permissions": [{
        "permissionId": "1",
        "action": "Remove"
    }, {
        "permissionId": "2",
        "action": "Create"
    }, {
        "permissionId": "3",
        "action": "Read"
    }]
}];

var newArray = arr.map(function(obj){ 
  var rObj = {};
  rObj[obj.name] = obj.permissions.map(function(childObj){
     return childObj.action;       
  });
  return rObj;
});

console.log(newArray);

https://jsfiddle.net/daze5a4c/1/

answered Apr 20, 2016 at 13:09

Thalaivar

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1 Comment

Jagdish Idhate Over a year ago

Output is object not an array

Starfish · Accepted Answer · 2016-04-20 13:12:47Z

var json = [{
  "roleId": "1",
  "name": "Superadmin",
  "permissions": [{
    "permissionId": "1",
    "action": "Remove"
  }]
}, {
  "roleId": "2",
  "name": "Administrator",
  "permissions": [{
    "permissionId": "1",
    "action": "Remove"
  }, {
    "permissionId": "2",
    "action": "Create"
  }, {
    "permissionId": "3",
    "action": "Read"
  }]
}];

var roles = {};

json.forEach(function(obj) {
  var actions = [];
  obj.permissions.forEach(function(permission) {
    actions.push(permission.action);
  });
  roles[obj.name] = actions;
});

console.log(roles);

This is exactly how you want it. Just loop through the JSON-objects and get the properties you need to store them in another object (roles).

Output:

{
   Superadmin: ['Remove'],
   Administrator: ['Remove', 'Create', 'Read']
}

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