@astrojs/node

This adapter allows Astro to deploy your SSR site to Node targets.

If you’re using Astro as a static site builder—its behavior out of the box—you don’t need an adapter.

If you wish to use server-side rendering (SSR), Astro requires an adapter that matches your deployment runtime.

Node is a JavaScript runtime for server-side code. Frameworks like Express are built on top of it and make it easier to write server applications in Node. This adapter provides access to Node’s API and creates a script to run your Astro project that can be utilized in Node applications.

First, install the @astrojs/node package using your package manager. If you’re using npm or aren’t sure, run this in the terminal:

npm install @astrojs/node

Then, install this adapter in your astro.config.* file using the adapter property:

import { defineConfig } from 'astro/config';
import node from '@astrojs/node';

export default defineConfig({
  // ...
  output: 'server',
  adapter: node()
})

After performing a build there will be a dist/server/entry.mjs module that exposes a handler function. This works like a middleware function: it can handle incoming requests and respond accordingly.

You can use this handler with any framework that supports the Node request and response objects.

For example, with Express:

import express from 'express';
import { handler as ssrHandler } from './dist/server/entry.mjs';

const app = express();
app.use(express.static('dist/client/'))
app.use(ssrHandler);

app.listen(8080);

This output script does not require you use Express and can work with even the built-in http and https node modules. The handler does follow the convention calling an error function when either

• A route is not found for the request.
• There was an error rendering.

You can use these to implement your own 404 behavior like so:

import http from 'http';
import { handler as ssrHandler } from './dist/server/entry.mjs';

http.createServer(function(req, res) {
  ssrHandler(req, res, err => {
    if(err) {
      res.writeHead(500);
      res.end(err.toString());
    } else {
      // Serve your static assets here maybe?
      // 404?
      res.writeHead(404);
      res.end();
    }
  });
}).listen(8080);

This adapter does not expose any configuration options.

For help, check out the #support-threads channel on Discord. Our friendly Support Squad members are here to help!

You can also check our Astro Integration Documentation for more on integrations.

This package is maintained by Astro’s Core team. You’re welcome to submit an issue or PR!

See CHANGELOG.md for a history of changes to this integration.

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