# Reference

> Look up imports, inspect routes, and compare adapter behavior.

## Reference pages

- [Contract internals](https://hulla.dev/docs/api/reference/architecture.md): Inspect a contract as a flat list of routes.
- [2.0 migration reference](https://hulla.dev/docs/api/reference/migration.md): Find the 2.0 replacements for 1.x imports, methods, and behavior.
- [Adapter requirements](https://hulla.dev/docs/api/reference/adapter-conformance.md): Compare routing, body parsing, errors, and cancellation across server adapters.
- [Package exports](https://hulla.dev/docs/api/reference/exports.md): Find the import path for a core API or integration package.