Should use the convention of your framework. eg process.env in Next.js.

It's not process.env that it needs to access. It's the Cloudflare workers bindings which are also exposed through a variable named env. It also does not change the fact that the example shown in the docs will not compile.

env is de-structured from context, which is passed in by the Cloudflare runtime every time a request is made.
You may refer this - https://developers.cloudflare.com/d1/get-started/#write-queries-within-your-worker

export const onRequest = async (context) => {
  const { request, env } = context;
  
  return NextAuth({
    providers: [],
    adapter: D1Adapter(env.db),
  })(request);
};

You may try using the above snippet once & let me know if it works.

I have the same issue with the D1adapter, the original code doesn't work. When I change the code to process.env.db, it's not work neither.

In my view, the D1Adapter (function D1Adapter(db: D1Database)) needs a D1Database object, not the configuration 'env.DB'
btw, the D1 could work in my nextjs app, I test in submit some text to D1, it's ok

It's not process.env that it needs to access. It's the Cloudflare workers bindings which are also exposed through a variable named env. It also does not change the fact that the example shown in the docs will not compile.

hi, britt
I have some problems when using next-auth in my nextjs+cloudflarePages+D1, it's about the D1 adapter,

It's my code in auth.ts , but it not working
Could you please provide guidance on how to configure the D1Adapter? I would greatly appreciate your help. Thank you!

I am stuck on this as well. I thought I almost had it working with the below code as it does give me access to the D1 instances but getting the error "vite_ssr_import_0.default is not a function"

src/middleware/index.ts

import NextAuth from "next-auth";
import { D1Adapter } from "@auth/d1-adapter";
import Email from "@auth/core/providers/email";

export function onRequest(context, next) {
  const env = context.locals.runtime.env;

  const auth = NextAuth({
    providers: [Email],
    adapter: D1Adapter(env.D1),
  })(context.request);

  return next();
}

I managed to get the D1 adapter working on a next app and opened a PR to update the documentation #12164