Laravel And JqueryUI's Autocomplete Plugin

autocomplete.php

//SearchController.php
public function autocomplete(){
	$term = Input::get('term');
	
	$results = array();
	
	$queries = DB::table('users')
		->where('first_name', 'LIKE', '%'.$term.'%')
		->orWhere('last_name', 'LIKE', '%'.$term.'%')
		->take(5)->get();
	
	foreach ($queries as $query)
	{
	    $results[] = [ 'id' => $query->id, 'value' => $query->first_name.' '.$query->last_name ];
	}
return Response::json($results);
}


//View
{{ Form::open(['action' => ['SearchController@searchUser'], 'method' => 'GET']) }}
    {{ Form::text('q', '', ['id' =>  'q', 'placeholder' =>  'Enter name'])}}
    {{ Form::submit('Search', array('class' => 'button expand')) }}
{{ Form::close() }}


//Route
Route::get('search/autocomplete', 'SearchController@autocomplete');


//Javascript
$(function()
{
	 $( "#q" ).autocomplete({
	  source: "search/autocomplete",
	  minLength: 3,
	  select: function(event, ui) {
	  	$('#q').val(ui.item.value);
	  }
	});
});

I noticed that your web page does not include the JS library from jQuery Ui's CSS and JS library.

Firstly, include the following libaries into your web pages:

<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<!-- jQuery -->
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<!-- jQuery UI -->
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.min.js"></script>
<script type="text/javascript">

Checkout this guide: https://www.tutsmake.com/laravel-jquery-ui-autocomplete-ajax-search-example/