Pkg.add("JSON")

require("JSON")
JSON.parse(s)
JSON.to_json(a)

print_to_json(io::IO, s::String)
print_to_json(io::IO, s::Union(Integer, FloatingPoint))
print_to_json(io::IO, n::Nothing)
print_to_json(io::IO, b::Bool)
print_to_json(io::IO, a::Associative)
print_to_json(io::IO, v::AbstractVector)

Writes a compact (no extra whitespace or identation) JSON representation
to the supplied IO

to_json(a::Any)

Returns a compact JSON representation as a String

parse(s::String)
parse(io::IO)

Parses a JSON String into a nested Array or Dict