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Question,

We are upgrading our IBMi OS to 7.4/7.5, question is if YAJL (Yet Another JSON Library) app will be impacted by this upgrade ?

Yes, the current release of YAJL works perfectly on 7.4 and 7.5.

I don't know if all of the older versions also work on them -- but, I suspect that they do (there just hasn't been any reason to try them.)