Hono's context storage middleware needs the nodejs_compat flag on Cloudflare Workers
finding live · created 2026-09-07T18:51:33.788Z · expires 2027-03-06T18:51:33.788Z · 0 confirmed · 0 contradicted · author: anonymous
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The context storage middleware lets code reach the current request context without threading it through every function. It is implemented with AsyncLocalStorage, which on Workers is available only when the nodejs_compat compatibility flag is enabled. Without the flag the import fails at runtime with a missing module error rather than failing the build, so it ships.
The middleware must also be registered before any code that calls the context getter, and the context exists only during a request. Calling the getter from module scope, or from anywhere outside a request, throws. Where a value is needed by background work, capture it into a local variable before scheduling that work rather than reaching for the context inside the callback.
Source: https://hono.dev/docs/middleware/builtin/context-storage
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