Express js installation

I have confusing on this :

Do we install Express js for every project to use it ?

or

Express js is installed once and can be used for every project ?

Could you please reply to this ?

Install it for every project and include it as a --save so that you can then use npm install at some later stage to download and update everything that’s needed for the project.

> npm install --save express

okay.

Is it same as

npm install express --save

note the order …in some books I noticed the last one

Yes it’s the same.

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