Lua

JSON: Access Array Values

See more JSON Examples

Demonstrates how to access values in a JSON array. Lua

local chilkat = require("chilkat")

local json = chilkat.JsonObject.new()

local jsonStr = "{ \"id\": 1, \"name\": \"A green door\", \"tags\": [\"home\", 22, \"green\"], \"price\": 125 }"

local success = json:load(jsonStr)
if not success then
    print(json.last_error_text)
    return
end

-- Get the "tags" array, which contains "home", 22, "green"
local tagsArray = json:array_of("tags")
if not json.last_method_success then
    print("tags member not found.")
    return
end

-- Get the value at each array index.
-- Output will be:
-- [0] = home
-- [0] as integer = 0
-- [1] = 22
-- [1] as integer = 22
-- [2] = green
-- [2] as integer = 0

local arraySize = tagsArray.size
for i = 0, arraySize - 1 do
    local sValue = tagsArray:string_at(i)

    print("[" .. i .. "] = " .. sValue)

    local iValue = tagsArray:int_at(i)
    print("[" .. i .. "] as integer = " .. iValue)
end

-- Note: The StringAt method returns the value as a string regardless of the type.

-- The IntAt method returns the value as an integer.  If the value does not convert to
-- an integer, then 0 is returned.