For what it’s worth, I think I can compress this question down to the following: When I inspect the workings of all middleware via :reitit.middleware/transform middleware-dev/print-request-diffs , I would expect that: • in the very last step, I see a map that contains a :body which is a String. • What I instead observe is that the body still is a map. Since (as seen above) both content negotiation and coercion middleware are in place (and I can confirm the coercion itself is working), I wonder if • I have forgot something, or • Something further down the line should convert that map to a String and it’s not working Thanks again in advance