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Now to give you an example,

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I have a brand new empty project here,

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it got no application inside of it.

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And now let's say we wanna create

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a node application in there.

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Up to this point in the course,

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I always gave you a finished node application,

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a starting application,

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I always gave you a file attachment.

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Now the problem with that just is

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that we can create such an application

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without node being installed on our system.

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But it would be quite cumbersome.

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Because we need this package .JSON file

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with some configuration about the node app.

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Most importantly,

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with a list of dependencies this app needs.

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And yes, we could use some blueprints here

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and copy and paste that into any new project we have.

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And we can type it all out by hand here,

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this would be possible.

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But typically, you create new node projects

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by running npm init, in your project folder,

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and npm init will then walk through a couple of questions.

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And at the end, create a package JSON file

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with the answers to the questions posed

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and some defaults filled in.

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Now, the problem about that just is

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that NPM is not a command,

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which is available on your machine just like this,

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it's only available if you got node JSON installed.

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And for that,

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you need to visit nodejs.org downloaded.

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Now the problem with that, in turn,

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is that the entire idea behind Docker is

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that we don't need to install tools globally

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on our host machine.

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Instead, we want to use containers,

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which include the environments our application needs.

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Nonetheless, to set up an application in the first place,

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we basically need to install Node JS

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in order to run this NPM command.

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Unless we want to type this package .JSON file by hand.

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And you might think that this is a node specific problem.

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But it's not.

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If you start working with PHP

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and maybe frameworks like Laravel,

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you will need even more complex setup on your system.

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And you will need to install even more tools

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just to set up such a Laravel application, for example.

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So it's not node specific.

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A lot of projects and a lot of programming languages

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need some extra tools to be installed on your system

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on your host machine in order to create the projects.

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And yes, you can put the project

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into a container thereafter.

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But the initial creation

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still needs these tools to be installed on your system.

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And that's exactly where utility containers can help us

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so therefore, let's no dig into utility containers.

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And let's in general, explore what we can do with Docker

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beyond running some application.