Server Adapters

Official Adapters

Idiomatic Remix apps can generally be deployed anywhere because Remix adapts the server's request/response to the Web Fetch API. It does this through adapters. We maintain a few adapters:

@remix-run/architect
@remix-run/cloudflare-pages
@remix-run/cloudflare-workers
@remix-run/express

These adapters are imported into your server's entry and are not used inside your Remix app itself.

If you initialized your app with npx create-remix@latest with something other than the built-in Remix App Server, you will note a server/index.js file that imports and uses one of these adapters.

If you're using the built-in Remix App Server, you don't interact with this API

Each adapter has the same API. In the future we may have helpers specific to the platform you're deploying to.

Community Adapters

@fastly/remix-server-adapter - For Fastly Compute@Edge.
@mcansh/remix-fastify - For Fastify.
@mcansh/remix-raw-http - For a good old bare bones Node server.
@netlify/remix-adapter - For Netlify.
@netlify/remix-edge-adapter - For Netlify Edge.
@vercel/remix - For Vercel.
remix-google-cloud-functions - For Google Cloud and Firebase functions.
partymix - For PartyKit.

Creating an Adapter

`createRequestHandler`

Creates a request handler for your server to serve the app. This is the ultimate entry point of your Remix application.

const {
  createRequestHandler,
} = require("@remix-run/{adapter}");
createRequestHandler({ build, getLoadContext });

Here's a full example with express:

const {
  createRequestHandler,
} = require("@remix-run/express");
const express = require("express");

const app = express();

// needs to handle all verbs (GET, POST, etc.)
app.all(
  "*",
  createRequestHandler({
    // `remix build` and `remix dev` output files to a build directory, you need
    // to pass that build to the request handler
    build: require("./build"),

    // return anything you want here to be available as `context` in your
    // loaders and actions. This is where you can bridge the gap between Remix
    // and your server
    getLoadContext(req, res) {
      return {};
    },
  })
);

Here's an example with Architect (AWS):

const {
  createRequestHandler,
} = require("@remix-run/architect");
exports.handler = createRequestHandler({
  build: require("./build"),
});

Here's an example with the simplified Cloudflare Workers API:

import { createEventHandler } from "@remix-run/cloudflare-workers";

import * as build from "../build";

addEventListener("fetch", createEventHandler({ build }));

Here's an example with the lower-level Cloudflare Workers API:

import {
  createRequestHandler,
  handleAsset,
} from "@remix-run/cloudflare-workers";

import * as build from "../build";

const handleRequest = createRequestHandler({ build });

const handleEvent = async (event: FetchEvent) => {
  let response = await handleAsset(event, build);

  if (!response) {
    response = await handleRequest(event);
  }

  return response;
};

addEventListener("fetch", (event) => {
  try {
    event.respondWith(handleEvent(event));
  } catch (e: any) {
    if (process.env.NODE_ENV === "development") {
      event.respondWith(
        new Response(e.message || e.toString(), {
          status: 500,
        })
      );
    }

    event.respondWith(
      new Response("Internal Error", { status: 500 })
    );
  }
});