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Finally following up here... We ended up writing a JSON parser and checking it in under clangd/. We've been using that for a while now without hitting new problems. The header is here: https://reviews.llvm.org/source/clang-tools-extra/browse/clang-tools-extra/trunk/clangd/JSONExpr.h It's a DOM-based approach with objects on the heap. There's no streaming parser, though one could be bolted on for e.g. long arrays. There are some weak conventions around marshalling to structs with ADL functions. Compared to what was described in my doc, it's simpler but less effici...

We don't have a dedicated JSON library in the LLVM tree, I'd like to add one. The pressing need is for clangd, but we have other tools that read/write JSON too. I'm proposing we write a new one, rather than importing a third-party library (licensing/integration reasons), on or extending YamlParser/YamlIO (usability/flexibility). I lean towards a design that parses a full DOM at once,