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Back in openstreetmap/openstreetmap-website#3501 we've talked about adding JSON support for a few remaining endpoints. Unfortunately, this project never took off. Why not give it another try now.
I found a streaming json parser based on yajl called sjparser, that has schema support. It offers a much saner interface than yajl alone, and emits one OSM element at a time. It also hides all that ugly state handling, unlike the XML parser we have in place today.
There are a few other changeset related endpoints (create / update) that don't support JSON. This can be addressed in another PR. Single object edit operations will continue be out of scope for this repo.