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How can I add Bootstrap to a project in ExpressJS?

I’m developing an aplication using nodejs and the framework Express.
I want to add Bootstrap to my project in local.
I added this to my index <head>

<script language="javascript" src=""></script>
<link rel="stylesheet" href=""/>

I found that I have to add this code to my app.js

app.use(express.static(__dirname + '../node_modules/bootstrap/dist'));

but it doesn’t works too.
(I have in mind the path of the Bootstrap and use ‘../modules…’ too)