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What if the integer exceeds the maximum allowed on 32 bit machines and you try to decode the JSON?

That has nothing to do with JSON, which allows numbers of arbitrary size.

This is mostly just a typo in the examples I put, but I will consider using only strings for this type of stuff, to avoid issues.

Given the dataset you have to serve, I don't think you'll be having any issues if most of the JSON parsers give you 32bit integers.