Fix failed Fastify deploy on Render
To get a boilerplate Fastify app to deploy on Render.com, you need to read to listen on PORT environment variable.
Background: When trying to deploy a basic Fastify app to Render.com, I received a generic failure method: Deploy failed for COMMIT_HASH. The log indicated that the server started correctly, and there was no information indicating why the deploy failed.
The fix: I couldn’t find docs for running Fastify on Render.com, but there are example repos for other languages and libraries. The Render example for Express included a reference to process.env.PORT. By adding that to my Fastify app, I was able to successfully deploy.
Copy and paste:
const port = process.env.PORT || 8080;
const server = fastify()
server.listen({ port }, () => "Hello world!");
If you’re using TypeScript, you will have to convert the environment variable to a number:
// TypeScript
const port = process.env.PORT ? parseInt(process.env.PORT) : 8080;
Read more:
- https://www.fastify.io/docs/latest/
- https://render.com/docs
- https://github.com/render-examples/express-hello-world/blob/main/app.js#L3