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":"markus.maier@mail.de",
    "externalId":"mmaie",
    "company":"Intel"
    },
    {
    "id":2,
    "firstName":"Birgit",
    "lastName":"Bauer",
    "email":"birgit.bauer@mail.de",
    "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": "markus.maier@mail.de", "externalId": "mmaie", "company": "Intel" }, { "id": 2, "firstName": "Birgit", "lastName": "Bauer", "email": "birgit.bauer@mail.de", "externalId": "bbaue" }]; var emails = data.map(d => d.email); console.log(emails); 

Answer 2

Follow the code.loop through the data each object and for each object get the desired value by key.

 var data = [ { "id":1, "firstName":"Markus", "lastName":"Maier", "email":"markus.maier@mail.de", "externalId":"mmaie", "company":"Intel" }, { "id":2, "firstName":"Birgit", "lastName":"Bauer", "email":"birgit.bauer@mail.de", "externalId":"bbaue" } ]; for(var i=0; i< data.length;i++){ console.log(data[i]['email']); }