Julia Language Serializing JSON


Example

The JSON.json function serializes a Julia object into a Julia String containing JSON:

julia> using JSON

julia> JSON.json(Dict(:a => :b, :c => [1, 2, 3.0], :d => nothing))
"{\"c\":[1.0,2.0,3.0],\"a\":\"b\",\"d\":null}"

julia> println(ans)
{"c":[1.0,2.0,3.0],"a":"b","d":null}

If a string is not desired, JSON can be printed directly to an IO stream:

julia> JSON.print(STDOUT, [1, 2, true, false, "x"])
[1,2,true,false,"x"]

Note that STDOUT is the default, and can be omitted in the above call.

Prettier printing can be achieved by passing the optional indent parameter:

julia> JSON.print(STDOUT, Dict(:a => :b, :c => :d), 4)
{
    "c": "d",
    "a": "b"
}

There is a sane default serialization for complex Julia types:

julia> immutable Point3D
           x::Float64
           y::Float64
           z::Float64
       end

julia> JSON.print(Point3D(1.0, 2.0, 3.0), 4)
{
    "y": 2.0,
    "z": 3.0,
    "x": 1.0
}