Bootstrap, as one of the most popular front-end framework, which first approach is to make mobile friendly websites, so you may have developed your project using this framework, isn’t it? Well, while doing that project, now after all, you may want to integrate it in WordPress project right? Well, all of them is easy and the only thing which takes quite a time is Bootstrap Navbar. Hence here, we will describe about how to integrate bootstrap navwalker into your WordPress theme.

What is Bootstrap?
Well, first of all let us discuss about Bootstrap framework. So, what really is Bootstrap? Well, the answer to it is, it the the most popular HTML, CSS and JS framework for developing the responsive mobile first friendly web pages. It comes up with all of the required components to build any site very quickly.
Since this framework has many components included in it, so, you can integrate those on any way you like for your project. But, in the case of the navigation or navbar, it has its own way of displaying it to your project. And integrating this in your WordPress themes build in this framework may require some of the work to be done, which we will discuss here.
Integrate Bootstrap NavWalker Into WordPress Theme
If you need to integrate Bootstrap navwalker into your WordPress theme, then, there is an excellent framework developed for this particular feature, which can be visited through this link.
Now, you just need to download the zip file from that GitHub repo and you will need to extract the zip file in your theme folder, probably in /wp-content/themes/your-theme/inc folder. The required file for this is named as wp_bootstrap_navwalker.php. Now, what you have to do is, you need to include this file for this to work, since adding this file only in your project is of no use.
Hence, to include this file on your project, open up your functions.php file of the theme and then add this PHP code in that file: require get_template_directory() . '/inc/wp_bootstrap_navwalker.php';
After the above step is done, the required file is included in your project and is now ready to be used. Hence, after this process, open up your header.php file of the theme and place this PHP code in the required place of your project to display the Bootstrap Navigation or Navbar, which is below:
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
<span class="sr-only"><?php esc_html_e('Toggle navigation', 'theme-textdomain'); ?></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<?php
wp_nav_menu(array(
'theme_location' => 'primary', // Defined when registering the menu
'container' => 'div',
'depth' => 2,
'container_class' => 'collapse navbar-collapse',
'container_id' => 'navbar',
'menu_class' => 'nav navbar-nav',
'fallback_cb' => 'wp_bootstrap_navwalker::fallback',
'walker' => new wp_bootstrap_navwalker() // This controls the display of the Bootstrap Navbar
));
?>
Note: Since Bootstrap 4 has been released and displays the navigation differently, it needs to be integrated differently for that. Do not worry on this, we have got you covered up. You can follow this link: Integrate Bootstrap NavBar 4 Into WordPress Theme to integrated Bootstrap NavWalker for Bootstrap 4.
Output after you integrate Bootstrap navwalker in your WordPress theme
Now, if you have added the PHP code as mentioned above in your project files, then, the output after you integrate Bootstrap navwalker will be similar to as below:

If you want to learn about how to assign the menu to particular menu location area provided via the theme, then, you can follow this link.
Conclusion
Now, if you have followed this tutorial properly and was able to integrate Bootstrap navwalker into your WordPress theme properly, then, we can assume that you are now more familiar with this than before. But, if you are still confused on this and want more help, then, please do drop the comment below in the comment box and we will follow it up.