JavaScript | Iterate through JSON Object and get all the values for a specific key

Question

I have following JSON:

  [ {
    "id":1,
    "firstName":"Markus",
    "lastName":"Maier",
    "email":"[email protected]",
    "externalId":"mmaie",
    "company":"Intel"
    },
    {
    "id":2,
    "firstName":"Birgit",
    "lastName":"Bauer",
    "email":"[email protected]",
    "externalId":"bbaue"
    } ]

I want to iterate through both objects and get the value of the "email" key.. what is the simplest way to do that? Thanks!

Answer 1

If you want to end up with an array of just the emails, you may want to look into the .map() function.

var data = [{
  "id": 1,
  "firstName": "Markus",
  "lastName": "Maier",
  "email": "[email protected]",
  "externalId": "mmaie",
  "company": "Intel"
}, {
  "id": 2,
  "firstName": "Birgit",
  "lastName": "Bauer",
  "email": "[email protected]",
  "externalId": "bbaue"
}];

var emails = data.map(d => d.email);

console.log(emails);