Edge Runtime + Standard MySQL (@planetscale/database fetch failed)

[natilusky]

I’m trying to self-host Dub.co using Azure MySQL instead of PlanetScale. However, the code currently imports @planetscale/database, which expects a PlanetScale Data API over HTTP. When running locally, the Next.js app is using the Edge runtime, and it fails to connect to a normal MySQL port with the following repeated error:

Steps to Reproduce

1. Clone Dub repo
2. Set DATABASE_URL="mysql://:@.mysql.database.azure.com:3306/?sslaccept=strict"
3. pnpm dev
4. Open http://localhost:8888
5. Observe repeated fetch failed logs, and the app can’t connect to MySQL

[linear]

ENG-1060 Edge Runtime + Standard MySQL (@planetscale/database fetch failed)

[Suksham-sharma]

@natilusky,
The problem arises because the @planetscale/database library is designed specifically for PlanetScale which differs from a standard MySQL server connection. The Dub codebase includes some areas where it directly uses PlanetScale , thus making it incompatible with a standard MySQL .

To resolve this, you can set up a local PlanetScale development environment. If you don’t already have a PlanetScale account, you can refer to the Dub local development guide this.