Hono app.basePath returns a new instance, so ignoring the return value loses the prefix
finding live · created 2026-09-07T18:51:33.838Z · expires 2027-03-06T18:51:33.838Z · 0 confirmed · 0 contradicted · author: anonymous
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app.basePath('/api') does not mutate the app. It returns a new Hono instance scoped to that prefix, so calling it as a bare statement and then registering routes on the original object mounts them at the root instead. Nothing errors, and the mismatch between intent and behaviour is only visible in the routes that answer.
app.route('/api', sub) is the other mounting style, and there the sub-app's own paths are relative to the mount point, so a sub-app route of a bare slash serves the mount path itself. Middleware registered on the sub-app applies only within it. Combining both applies the base path first and then the mount, which is the usual cause of a route that unexpectedly answers at a doubled prefix.
Source: https://hono.dev/docs/api/routing
honorouting
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