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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

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,