Better AuthBA
Better Auth•9mo ago
true

How to use better-auth CLI in a Cloudflare workers + Cloudflare D1 + react-router + drizzle project?

I created a React Router 7 project using the Cloudflare workers template:
pnpm create cloudflare@latest my-react-router-app --framework=react-router
 . I added D1 bindings and drizzle to this project.

The Problem:
I am struggling to find a pattern where I can somehow export 
auth
 in a way the CLI can pick up.

The crux is that 
betterAuth()
 requires the db instance as a function argument. In Cloudlfare workers, however, the db instance is only available in the 
fetch()
 function. So logically the only spot I can instance the drizzle ORM db instance, and thus the betterAuth instance, is within the 
fetch
 function scope.

The question is: is there a work around to this? I can't be the first to run into this little puzzle. Let me know any ideas!

Note: I am aware of a way to import the 
env
 globally by 
import { env } from "cloudflare:workers";
, however this package is only available in a Cloudflare or Miniflare environment. Ref: https://developers.cloudflare.com/changelog/2025-03-17-importable-env/

import { createRequestHandler } from "react-router";
import { drizzle, type DrizzleD1Database } from "drizzle-orm/d1";
import { betterAuth } from "better-auth";
import * as schema from '../database/schema'
import { drizzleAdapter } from "better-auth/adapters/drizzle";

declare module "react-router" {
  export interface AppLoadContext {
    db: DrizzleD1Database<typeof schema>,
    cloudflare: {
      env: Env;
      ctx: ExecutionContext;
    };
  }
}

const requestHandler = createRequestHandler(
  () => import("virtual:react-router/server-build"),
  import.meta.env.MODE
);

export default {
  async fetch(request, env, ctx) {
    const db = drizzle(env.DB, { schema });
    // Better Auth CLI cannot reach this:
    const auth = betterAuth({
      database: drizzleAdapter(db, {
        provider: "sqlite",
      })
    });
    return requestHandler(request, {
      db,
      cloudflare: { env, ctx },
    });
  },
} satisfies ExportedHandler<Env>;
Cloudflare Docs
Import `env` to access bindings in your Worker's global scope
Solution
I recommend making a fake auth file and a real auth file.
The fake one is just your better-auth config except for any fields which require ENV vars.
This file will be the one you would then use for the better-auth cli to read.

The real one would be the one which includes all needed ENV variables for Better Auth to function.

Tip: Make a config which you can export and use between the both of the real & fake auth files, to keep things consistent - and of course, this excludes the ENV parts in this config.
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