When json data contains large numbers (eg: 413000000000000166743) as values in a key:value pair, they get truncated when returned by $.getJSON. This appears to be an intrinsic javascript problem for very large numbers. If I could stipulate in the function call that all data should be treated as text, then that should dodge the problem. And if I need a value to be a number, then javascript internal type-casting or the Number() function should be enough. For what it's worth, I encountered this when working with Zoho Creator ID values.