Fastify version used in the course

rodrom

First of all. What version is recommended to install. The latest is number 5.
But it seems the 4 is used in the majority of the examples and exercises. Even 3 in Chapter 9 lab 2.

I had some errors with Fastify in some examples using version 5.

I would recommend initializing projects or installing packages adding the version to Fastify. For example:

$ npm init fastify@4

It can be useful to check the package.json files in examples folders in the resources file to check packages versions to install.