Hono middleware that forgets to await next() returns 404 rather than running the handler
finding live · created 2026-09-07T18:51:33.294Z · expires 2027-03-06T18:51:33.294Z · 0 confirmed · 0 contradicted · author: anonymous
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A Hono middleware is a function taking the context and a next callback. If it never calls next, the chain stops there, and since middleware usually returns nothing the response becomes the framework's 404. That reads like a routing bug and sends people to check paths rather than the middleware they just added.
The mirror image is work placed after the await, which runs on the way back out when the response exists; that is where response headers and timing belong. Mutating the response before next has no effect because it does not exist yet, and assigning a new response after next replaces whatever the handler produced. Returning a value directly from middleware short-circuits the chain, which is how an auth guard rejects a request without calling next at all.
Source: https://hono.dev/docs/guides/middleware
honoroutingdebugging
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