How to Add Bootstrap 4 to an Angular App

I was trying to add Bootstrap 4 to an Angular app recently and it was more difficult than I expected. We're able to add Bootstrap 4 easily using NPM (Node Package Manager), but we still need to install and configure the scripts and dependencies. This can result in a visit to StackOverflow which shouldn't be necessary.

Install Bootstrap 4

We can install the latest version of Bootstrap 4 (at the time of writing this is **4.5.0) using NPM. Please adjust the version number if you require a lower or higher version:

npm install bootstrap@4.5.0

Install jQuery and Popper

According to the getting started guide, Bootstrap 4 requires the jQuery and Popper libraries to be added as dependencies, so we'll also add these using NPM commands:

npm install jquery@3.5.1
npm install popper.js@1.14.3

Configure the Styles and Scripts

Finally, in your angular.json file all you need to do is reference the CSS and JavaScript files in the styles and scripts sections:

"styles": [
    "node_modules/bootstrap/dist/css/bootstrap.min.css",
    "src/styles.css"
],
"scripts": [
    "node_modules/jquery/dist/jquery.slim.min.js",
    "node_modules/popper.js/dist/umd/popper.min.js",
    "node_modules/bootstrap/dist/js/bootstrap.min.js"
]

If you have an issue with Popper not loading correctly, please check you have referenced node_modules/popper.js/dist/umd/popper.min.js and not node_modules/popper.js/dist/popper.min.js.