Question

176

Can a JSON array contain objects of different key/value pairs?

rated 0 times [ 180] [ 4] / answers: 1 / hits: 40184 / 11 Years ago, thu, august 22, 2013, 12:00:00

Can a JSON array contain Objects of different key/value pairs. From this tutorial, the example given for JSON array consists of Objects of the same key/value pair:

{

  "example": [

    {

      "firstName": "John",

      "lastName": "Doe"

    },

    {

      "firstName": "Anna",

      "lastName": "Smith"

    },

    {

      "firstName": "Peter",

      "lastName": "Jones"

    }

  ]

}

If I want to change it to have different key/value pairs inside the JSON array, is the following still a valid JSON?

{

  "example": [

    {

      "firstName": "John",

      "lastName": "Doe"

    },

    {

      "fruit": "apple"

    },

    {

      "length": 100,

      "width": 60,

      "height": 30

    }

  ]

}

Just want to confirm this. If so, how can I use JavaScript to know if the JSON "example" field contains the first homogeneous objects or the second heterogeneous objects?

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

coby

Add To Favorites

Follow

Total Points: 27

Total Questions: 102

Total Answers: 97

Location: Honduras

Member since Wed, Jul 14, 2021

3 Years ago

answered 11 Years ago piper · Accepted Answer

You can use any structure you like. JSON is not schema based in the way XML is often used and Javascript is not statically typed.

you can convert your JSON to a JS object using JSON.parse and then just test the existence of the property

var obj = JSON.parse(jsonString);

if(typeof obj.example[0].firstName != undefined) {

   //do something

}