Start from Web Standards

Before choosing a tool or writing more code, make the requirement concrete. The bookmarks handler reads a standard Request through context and returns a Response-compatible value.

Hono builds around Web Standard request and response APIs, which makes much of the application portable across runtimes. The useful target is not encyclopedic coverage. Make one deliberate choice, observe its consequences, and know which requirement would make you revise it.

A common failure is to learn only framework helper names and ignore the platform objects they wrap. The happy path may still work, which makes the mistake easy to miss. inspect the underlying Request and Response behavior and use helpers where they make intent clearer. Keep the first version small enough that every important input and output remains visible.

This supports the module goal: Build the smallest portable Hono application and identify exactly which parts depend on its runtime. Capture the request, command, trace, screenshot, test result, or other evidence that proves the result.

Write one route with Hono helpers and one with an explicit Response, then compare status, headers, and body. Change one condition on purpose, predict the result, and compare the prediction with what actually happened.