Migrating a Synchronous better-sqlite3 Layer to Async Cloudflare D1 (Without Losing Local Dev)
I recently shipped a project to Cloudflare Workers and hit a wall that a lot of people hit: my data layer was built on better-sqlite3 , which is synchronous and depends on a native Node addon. Neither of those things exists on the Workers runtime. Cloudflare's answer is D1, a SQLite-backed database, but it is only reachable through a Worker binding and its API is fully asynchronous. The naive…
In this tutorial, the author demonstrates a pattern for migrating a synchronous better-sqlite3 layer to an async Cloudflare D1 while preserving a local dev experience. The key steps include defining an async interface contract for data storage, keeping the SQL queries shared between both backends, implementing the better-sqlite3 backend by wrapping the synchronous driver, and finally implementing the D1 backend using its asynchronous API.
By following these steps, both local development and production environments can coexist seamlessly, with the runtime automatically selecting the appropriate backend.
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