JSON defines two data structures:

1. Collection of name-value pairs (objects)
2. Ordered list of values (array)

JSON defines the following data types for the values:

• Object – An object is an unordered set of name/value pairs. An object begins with ‘{‘ and ends with ‘}’. Each name is followed by ‘:’ (colon) and the name/value pairs are separated by ‘,’ (comma).
• Array – An array is an ordered collection of values. An array begins with ‘[‘ and ends with ‘]’. Array values are separated by ‘,’ (comma).
• String – A string is a sequence of zero or more Unicode characters, wrapped in double quotes, using backslash escapes.
• Number –  A number is a signed decimal number that may contain a fractional part and may use exponential E-notation. JSON does not allow non-numbers like NaN, nor does it make any distinction between integer and floating-point.
• Boolean – A boolean is either of the values true or false.
• null – An empty value, using the word null.