A very simple example of JSON is:

{
   "name":"James",
   "age":"30",
   "country":"France" 
}

Key-value pair or name-value pair syntax of JSON

• JSON starts with { (left brace).
• JSON ends with } (right brace).
• Keys in JSON are string in double quotes.
• Key and value in JSON is separated by : (colon).
• Each key-value pair in JSON is separated by , (comma).

JSON is based on two structures:

• JSON is a collection of name/value pairs. Various languages have different ways to represent a collection of name/value pairs. For example, object, hash table, hash map, struct, dictionary etc.
• An ordered list of values. This is generally represented as array, list, vector or sequence.

JSON as a document and MediaType

• JSON can be saved in your file system. The extension of such file should be .json.
• The MIME type or media type for JSON is application/json.

Important Note

• You can use special characters in “name” but this should be avoided to avoid portability issues.
• In the JSON name-value pair, it is mandatory to have double quotes (“) around name.
• In the JSON name-value pair, the value can be a string, boolean, number, null,object, or array.