Implement server that listens on process.env.PORT

asciella

In almost all the laboratory exercises of the JSNSD course it is required to implement a server that listens on the port present in process.env. To do this, just add the following code in app.js?

const {PORT} = process.env
module.exports = async function (fastify, opts) {
fastify.listen(PORT)
......
}

thanks

mikeadams

dominik.urban

const port = process.env.PORT || 3000; works fine.

Your solution, too!
The mentioned const {PORT} = process.env works as well due to the JS destructing assignment (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment)

Happy coding and good luck on your exam!

davidmarkclements

In a generated fastify project (npm init fastify) it uses fastify-cli.

The fastify-cli tool will use the PORT env var automatically, you don't need to do anything in that case, it's doing that under the hood for you.

gregsheppard

@davidmarkclements, this is where that happens, correct? I've been trying to unwind the magic of npm init fastify

https://github.com/fastify/fastify-cli/blob/db943dd470ce861df18bbc2807af9c6aaa3ed1cd/start.js#L82

davidmarkclements

correct