Better AuthBA
Better Auth•7mo ago
swajp

Email Domain Validation on Registration

Hi everyone,
I’m trying to restrict user registration in Better Auth to specific email domains (e.g., example.com, company.org).

Any help would be greatly appreciated! 🙏
Solution
you could do something like this with a hook. seems to work well for me

 hooks: {
    before: createAuthMiddleware(async (ctx) => {
      if (ctx.path.startsWith("/callback") && ctx.params?.id === "google") {
        const hd = ctx.query?.hd;
        if (!hd || (hd !== "domain1.com" && hd !== "domain2.com")) {
          throw new APIError("BAD_REQUEST", {
            message: "Google account must be from allowed domain",
          });
        }
        return;
      }

      if (ctx.path !== "/sign-up/email") {
          return;
      }

      const email = ctx.body?.email;
      if (!email || (!email.endsWith("@domain1.com") && !email.endsWith("@domain2.com"))) {
        throw new APIError("BAD_REQUEST", {
          message: "Email domain is not allowed",
        });
      }
    }),
  },
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