Migrating SvelteKit from Vercel to AWS Fargate

If you are seeing a warning from deploy-stack about your SvelteKit adapter, your project is currently using @sveltejs/adapter-auto (which often defaults to Vercel) or the explicit @sveltejs/adapter-vercel.

These adapters are designed specifically for proprietary serverless edge networks. To run your SvelteKit app in a scalable, standard Docker container on AWS Fargate, you need to switch to Svelte’s official Node adapter.

How to Fix

1. Install the Node Adapter

Run the following command in your terminal to install the Node adapter and remove the Vercel/Auto adapter:

npm install -D @sveltejs/adapter-node
npm uninstall @sveltejs/adapter-auto @sveltejs/adapter-vercel

2. Update svelte.config.js

Open your svelte.config.js file and change the adapter import at the top of the file.

Before (Locked into Vercel/Auto):

import adapter from '@sveltejs/adapter-auto'; // or '@sveltejs/adapter-vercel'
import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';

/** @type {import('@sveltejs/kit').Config} */
const config = {
  preprocess: vitePreprocess(),
  kit: {
    adapter: adapter()
  }
};

export default config;

After (AWS Ready):

import adapter from '@sveltejs/adapter-node';
import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';

/** @type {import('@sveltejs/kit').Config} */
const config = {
  preprocess: vitePreprocess(),
  kit: {
    adapter: adapter()
  }
};

export default config;

3. Deploy

Your SvelteKit app is now decoupled!

Run npx deploy-stack apply. The CLI will automatically detect the standard Node build output, package it into a hardened Docker container, and deploy it to your AWS cluster.