How to access key in a nested object

Question

{
  "5def224170a3ec0d90dbb89a": {
    "_id": "5def224170a3ec0d90dbb89a",
    "username": "dhruv1999",
    "fullname": "dhruv parmar",
    "email": "[email protected]",
    "phone": "7045691556",
    "password": "$2a$10$UOk8E4fbkkZvSRSzQqWK4eyJ2Z.qtL4D38thfhzkxJ1pSxSFn5fna",
    "__v": 0
  },
  "5def2747d135311a747a9660": {
    "_id": "5def2747d135311a747a9660",
    "username": "dhruv1998",
    "fullname": "parmar",
    "email": "[email protected]",
    "phone": "704591556",
    "password": "$2a$10$px5SK.OpP7i2Ryvg.ko/OeIbuq9XDT3luTrIBloNFCTiImUJC1BIm",
    "__v": 0
  }
}

How can i get all the email such as [email protected], [email protected]

I tried doing but not getting the email.

const userMap = {};
users.forEach(user => {
  userMap[user._id] = user;
});

userMap.forEach((obj) => {
      keys = Object.keys(obj);
      keys.forEach((key) => {
        console.log(obj[key].email);

      });

is userMap the object itself?

dork
– dork

2019-12-17 06:33:19 +00:00
Commented Dec 17, 2019 at 6:33 — dork
– dork, Commented Dec 17, 2019 at 6:33
Can you explain more about your object?

Mohammad
– Mohammad

2019-12-17 06:35:34 +00:00
Commented Dec 17, 2019 at 6:35 — Mohammad
– Mohammad, Commented Dec 17, 2019 at 6:35
Is this a Map object?

adiga
– adiga

2019-12-17 06:36:14 +00:00
Commented Dec 17, 2019 at 6:36 — adiga
– adiga, Commented Dec 17, 2019 at 6:36

Nick Parsons · Accepted Answer · 2019-12-17 06:45:08Z

The reason why the following doesn't work is because userMap is an object (you're also not closing your outer .forEach loop, which will be a syntax error) :

userMap.forEach((obj) => {
  keys = Object.keys(obj);
  keys.forEach((key)=>{
    console.log(obj[key].email);
  });

In order to use .forEach(), you need to use it on an array (or an array-like collection). Instead, you can get the Object.values() of your object. Object.values() gives back an array, so you can then use .map() on it to get the email properties:

const obj = {"5def224170a3ec0d90dbb89a": { "_id": "5def224170a3ec0d90dbb89a", "username": "dhruv1999", "fullname": "dhruv parmar", "email": "[email protected]", "phone": "7045691556", "password": "$2a$10$UOk8E4fbkkZvSRSzQqWK4eyJ2Z.qtL4D38thfhzkxJ1pSxSFn5fna", "__v": 0 }, "5def2747d135311a747a9660": { "_id": "5def2747d135311a747a9660", "username": "dhruv1998", "fullname": "parmar", "email": "[email protected]", "phone": "704591556", "password": "$2a$10$px5SK.OpP7i2Ryvg.ko/OeIbuq9XDT3luTrIBloNFCTiImUJC1BIm", "__v": 0 } }

const res = Object.values(obj).map(({email}) => email);
console.log(res);
console.log(res.join(', ')); // use `.join()` for string output

Trí Phan · Accepted Answer · 2019-12-17 06:36:46Z

1

Use for...in to iterate all keys of the object. Because forEach is an array method and userMap is an object so it can't use the method.

for (const id in userMap) {
  console.log(userMap[id].email);
}

answered Dec 17, 2019 at 6:36

Trí Phan

1,2033 gold badges17 silver badges36 bronze badges

Comments

kapil pandey · Accepted Answer · 2019-12-17 06:44:14Z

Assuming the name of our object is object.

let object={
  "5def224170a3ec0d90dbb89a": {
    "_id": "5def224170a3ec0d90dbb89a",
    "username": "dhruv1999",
    "fullname": "dhruv parmar",
    "email": "[email protected]",
    "phone": "7045691556",
    "password": "$2a$10$UOk8E4fbkkZvSRSzQqWK4eyJ2Z.qtL4D38thfhzkxJ1pSxSFn5fna",
    "__v": 0
  },
  "5def2747d135311a747a9660": {
    "_id": "5def2747d135311a747a9660",
    "username": "dhruv1998",
    "fullname": "parmar",
    "email": "[email protected]",
    "phone": "704591556",
    "password": "$2a$10$px5SK.OpP7i2Ryvg.ko/OeIbuq9XDT3luTrIBloNFCTiImUJC1BIm",
    "__v": 0
  }
}

for(let obj in object){
  console.log(object[obj].email)
}

For in loop gives all keys present in your object i.e 5def224170a3ec0d90dbb89a and 5def2747d135311a747a9660 and from there you can access email property.

qoomon · Accepted Answer · 2019-12-17 06:42:38Z

0

This one-liner should do the trick Object.entries(users).map(([key,value]) => value.email)

Object.entries(users) returns an array of key and value array
.map(([key,value]) => value.email) will extract email field from all users
- [key,value] is a destructuring assignment an easy way to assign the array values to variables

answered Dec 17, 2019 at 6:42

qoomon

5,6021 gold badge26 silver badges32 bronze badges

Comments

Faizan khan · Accepted Answer · 2019-12-17 06:43:08Z

0

using for...in loop

for (const key in array) {
    let obj = array[key];
    console.log(obj.email);
    }

answered Dec 17, 2019 at 6:43

Faizan khan

1853 silver badges15 bronze badges

Comments

sibasishm · Accepted Answer · 2019-12-17 06:43:22Z

Please note that forEach method is available for Arrays only. Hence you may want to use for...in here to iterate all the keys in the userMap object and then access the email key.

A working example:

const userMap = {
  "5def224170a3ec0d90dbb89a": {
    "_id": "5def224170a3ec0d90dbb89a",
    "username": "dhruv1999",
    "fullname": "dhruv parmar",
    "email": "[email protected]",
    "phone": "7045691556",
    "password": "$2a$10$UOk8E4fbkkZvSRSzQqWK4eyJ2Z.qtL4D38thfhzkxJ1pSxSFn5fna",
    "__v": 0
  },
  "5def2747d135311a747a9660": {
    "_id": "5def2747d135311a747a9660",
    "username": "dhruv1998",
    "fullname": "parmar",
    "email": "[email protected]",
    "phone": "704591556",
    "password": "$2a$10$px5SK.OpP7i2Ryvg.ko/OeIbuq9XDT3luTrIBloNFCTiImUJC1BIm",
    "__v": 0
  }
};

for (const id in userMap) {
  console.log(userMap[id].email);
}

Abhiram · Accepted Answer · 2019-12-17 06:54:34Z

0

A working example:

let data = {
  "5def224170a3ec0d90dbb89a": {
    _id: "5def224170a3ec0d90dbb89a",
    username: "dhruv1999",
    fullname: "dhruv parmar",
    email: "[email protected]",
    phone: "7045691556",
    password: "$2a$10$UOk8E4fbkkZvSRSzQqWK4eyJ2Z.qtL4D38thfhzkxJ1pSxSFn5fna",
    __v: 0
  },
  "5def2747d135311a747a9660": {
    _id: "5def2747d135311a747a9660",
    username: "dhruv1998",
    fullname: "parmar",
    email: "[email protected]",
    phone: "704591556",
    password: "$2a$10$px5SK.OpP7i2Ryvg.ko/OeIbuq9XDT3luTrIBloNFCTiImUJC1BIm",
    __v: 0
  }
};

   

Object.keys(data).forEach(item => {
  console.log(data[item].email);  //you can access email here.
});

edited Dec 17, 2019 at 6:54

answered Dec 17, 2019 at 6:48

Abhiram

1,6201 gold badge14 silver badges27 bronze badges

Comments

Rahul Gupta · Accepted Answer · 2019-12-17 12:32:07Z

-1

Use this code =>

  var data = {
    "5def224170a3ec0d90dbb89a": {
        "_id": "5def224170a3ec0d90dbb89a",
        "username": "dhruv1999",
        "fullname": "dhruv parmar",
        "email": "[email protected]",
        "phone": "7045691556",
        "password": "$2a$10$UOk8E4fbkkZvSRSzQqWK4eyJ2Z.qtL4D38thfhzkxJ1pSxSFn5fna",
        "__v": 0
    },
    "5def2747d135311a747a9660": {
        "_id": "5def2747d135311a747a9660",
        "username": "dhruv1998",
        "fullname": "parmar",
        "email": "[email protected]",
        "phone": "704591556",
        "password": "$2a$10$px5SK.OpP7i2Ryvg.ko/OeIbuq9XDT3luTrIBloNFCTiImUJC1BIm",
        "__v": 0
    }
}


let allEmails = '';

Object.keys(data).map((item) => {

    allEmails = allEmails + data.item.email + ','

})
console.log(allEmails) // here you will get all emails

Try this it will work definitely.

edited Dec 17, 2019 at 12:32

answered Dec 17, 2019 at 6:42

Rahul Gupta

152 bronze badges

4 Comments

qoomon Over a year ago

I think you want to use Object.values(data) instead of Object.keys(data)

qoomon Over a year ago

It should look like this let allEmails = Object.values(data).map(item => item.email).join(','); console.log(allEmails);

Rahul Gupta Over a year ago

You were wrong because Object.values(data) returns array of keys and i want that for looping Object.values(data) returns values but i dont need it.

Nick Parsons Over a year ago

@RahulGupta no, qoomon is correct, item.email doesn't make any sense if item is the key because then it will just be a string, and no property .email exists on a string. It makes sense if it is the value as that would be the object, where .email access the email property. Also currently, you're using .map() without using its return value. .map() isn't intended to be used this way. Instead, you can use .forEach() if all you intend on doing is iterating and causing side-effects.

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