A CNAME (Canonical Name) record is used in DNS to map an alias name to the canonical (true) domain name. This allows multiple domain names to refer to the same resource without duplicating DNS records. For example, www.example.com could be a CNAME for example.com.

JSON data is written as name/value pairs.
A name/value pair consists of a field name (in double quotes), followed by a colon, followed by a value:
"name":"Mark"
JSON can use arrays. Array values must be of type string, number, object, array, boolean or null..
For example:
{
"name":"John",
"age":30,
"cars":[ "Ford", "BMW", "Fiat" ]
}