Fastify

Inspect the owning package and existing implementation first. Reuse established project types, helpers, errors, lifecycle behavior, and test utilities. The patterns below are options, not an implementation checklist. Introduce one only when the current task requires it.

Project-specific rules

• Prefer explicit route handlers over generic request executors.
• Reuse existing global error handling and schemas.
• Preserve current HTTP contracts during internal migrations.
• Do not mandate new schema IDs, plugins, TypeIDs, or per-resource error stacks.

Fast, low-overhead web framework for Node.js with TypeBox schema validation.

Additional References