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RPG's array support has come a long, long way from the early days of the language.  This collection of articles covers many of the new features.

A collection of articles on coding Web Services with RPG using Data-Into, Data-Gen and other useful tools such as HTTPAPI

Find Jon Paris and Susan Gantner's content all in one single place and follow all new content pieces via email, regardless where they are published.

Jon Paris and Susan Gantner's Portfolio

Generating and Consuming JSON with RPG
Of course, one could always do it the hard way, i.e. stringing together requests and parsing responses "by hand". However, RPG gives us three main alternatives to this:
Embed SQL and use its JSON…

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DATA-INTO Plus DATA-GEN for Web Services