(Perl) 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.)

Chilkat Perl Downloads

Perl Module for Windows, MacOS, Linux, Alpine Linux

use chilkat();

# Let's say your JSON has this:

# {
# 	"id": 20000000001234567
# }

$json = chilkat::CkJsonObject->new();

$success = $json->LoadFile("qa_data/json/large_int.json");
if ($success == 0) {
    print $json->lastErrorText() . "\r\n";
    exit;
}

# 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
$id = $json->IntOf("id");
print "id: " . $id . "\r\n";

# 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:
$accountId = $json->stringOf("id");
print "accountId: " . $accountId . "\r\n";

# Sample output:

# id: -543893881
# accountId: 20000000001234567