process.env is always undefined in production

[rodolphoasb]

I've just migrated a project to RRv7 and react-router-hono-server, my app is being deployed to Railway.

The problem is that when I try to run it there I always get the process.env error:

process.env.DATABASE_HOST undefined
Error: Missing API key. Pass it to the constructor new Resend("re_123")
at new Resend (file:///app/node_modules/resend/dist/index.mjs:348:15)
at file:///app/apps/web-app/build/server/assets/server-build.js:533:16

const resend = new Resend(process.env.RESEND_API_KEY);

Here's my server index:

import { createHonoServer } from "react-router-hono-server/node";
import type { Context } from "hono";
import { i18next } from "remix-hono/i18next";
import { configDotenv } from 'dotenv'
import i18nextOpts from "@/localization/i18n.server";

configDotenv({ path: '.env' })

export default await createHonoServer({
	configure(server) {
		server.use("*", i18next(i18nextOpts));
	},
	defaultLogger: false,
	getLoadContext: async (c: Context, { build, mode }) => {
		const locale = i18next.getLocale(c);
		const t = await i18next.getFixedT(c);

		return {
			t,
			lang: locale,
			clientEnv: {
				NODE_ENV: process.env.NODE_ENV,
			},
			env: process.env,
			// We do not add this to AppLoadContext type because it's not needed in the loaders, but it's used above to handle requests
			body: c.body,
		};
	},
});

Any ideas about how can I fix this?

[rphlmr]

Hello 👋
Is it happening on the production build?
According to the trace, I would say yes.

I think you have to pass your environment variables before executing the start command or set them according to your hosting provider's recommendations.

DATABASE_HOST=xxx npm run start

Dotenv is only used in development mode. However, if you want to load an .env file, add it to the build/server folder, close to your index.js because configDotenv may expect to resolve the file relative to that location.