JSON Array

1. The square brackets [ ] are used to declare JSON array.
2. JSON array are ordered list of values.
3. JSON array can store multiple value types.
4. JSON array can store string, number, boolean, object or other array inside JSON array.
5. In JSON array, values must be separated by comma.
6. Arrays in JSON are almost the same as arrays in JavaScript.

e.g.

{
	"name" : "Admin",
	"age" : 36,
	"rights" : [ "admin", "editor", "contributor" ]
}

Get value at specific index location in array

You can access the array values by using the index number:

x = myObj.rights[0];

//Output

admin

Loop through array values

You can access array values by using a for-in loop:

for (i in myObj.rights) {
    x = myObj.rights[i];
    console.log(x);
}

//Output:

admin
editor
contributor

Delete array item

Use the delete keyword to delete items from an array:

delete myObj.rights[1];

Update array value at index location

Use the index number to modify an array:

myObj.rights[1] = "blogger";

Multi-dimensional array

We can store array inside JSON array, it is known as array of arrays or multidimensional array.

var myObj = {
    "name" 	 : "Joe",
    "rights" : [ 
    				[ "admin",  [1,2,3] ],
                 	[ "editor", [4,5,6] ]  
               ]
}  

Iterate over multi-dimensional array

for (i in myObj.rights) {

    for (j in myObj.rights[i]) {
         
        x = myObj.rights[i][j];

        console.log(x);
    }
}

Program Output:

1
2
3
4
5
6