Bootstrap 4 show input password when click on icon
npm install bootstrap4-show-password --save include plugin file
<script src="bootstrap-show-password.js"></script>Example
<div class="input-group">
<input type="password" name="user_password" id="user_password" class="form-control" data-toggle="password">
<div class="input-group-append">
<span class="input-group-text"><i class="fa fa-eye"></i></span>
</div>
</div>
``