Migrate Fastify from Koyeb to EasyHost

Move your Fastify app in four steps, and keep Koyeb running until the new deployment works.

Last updated November 9, 2026

Export your variables

Copy variables from the service settings in the Koyeb dashboard into a local .env file.

Then import them into EasyHost.

npx ezhst env import .env

Change the Fastify setup

No adapter is needed. Remove any serverless wrapper and call app.listen with host: "0.0.0.0".

koyeb.yaml, if you use one is not read by EasyHost, so its build and routing rules need moving into your app or into build settings.

Fastify binds to localhost by default, so you must pass host: "0.0.0.0".

Deploy and test

npx ezhst projects create my-project --link
npx ezhst apps create my-app
npx ezhst link --project <project-slug> --app <app-slug>
npx ezhst env import .env
npx ezhst deploy

Test your easyhost.fun URL before changing DNS. Koyeb runs your app on serverless containers, so check anything that depends on it, such as platform functions or cron configuration. Schedules move to EasyHost schedules.

Switch your domain

npx ezhst domains add www.example.com
npx ezhst domains list
npx ezhst domains verify www.example.com

Follow the custom domain guides for your DNS provider. Keep Koyeb running until traffic has moved. Also read why Fastify may be unreachable and the Koyeb overview.

Start for free

Install the skill, choose Global or Local, then tell your agent to deploy. No credit card, no config files.

npx ezhst skill install