Lua

Demonstrates how to Handle Large Integers in JSON

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Demonstrates how to handle large integers in JSON. (Integers larger than what can fit in a 32-bit signed integer.) Lua

local chilkat = require("chilkat")

-- Let's say your JSON has this:

-- {
--     "id": 20000000001234567
-- }

local json = chilkat.JsonObject.new()

local success = json:load_file("qa_data/json/large_int.json")
if not success then
    print(json.last_error_text)
    return
end

-- The integer is too large for a 32-bit signed integer that is returned by IntOf.
-- The result will be something that wrapped around and could be negative.
-- In this case it would be: -543893881
local id = json:int_of("id")
print("id: " .. id)

-- The solution is to read the integer value as a string, and then use the features in your programming language
-- to convert from a string to a 64-bit integer.
--
-- Alternatively, you may wish to simply hold the value as a string.  If, for example, the integer simply references
-- an order ID, an account ID, etc., then there's no need to convert to an integer value.  You're not going to be doing
-- mathematical operations on it anyway.  This is usually the case for large integers -- they typically exist
-- in JSON as an account ID.

-- You can get any JSON value as a string:
local accountId = json:string_of("id")
print("accountId: " .. accountId)

-- Sample output:

-- id: -543893881
-- accountId: 20000000001234567