No.
JSON is purely meant to be a data description language. As noted on http://www.json.org, it is a “lightweight data-interchange format.” – not a programming language.
Per http://en.wikipedia.org/wiki/JSON, the “basic types” supported are:
- Number (integer, real, or floating
point) - String (double-quoted Unicode
with backslash escaping) - Boolean
(true and false) - Array (an ordered
sequence of values, comma-separated
and enclosed in square brackets) - Object (collection of key:value
pairs, comma-separated and enclosed
in curly braces) null