500 (Internal Server Error) For Ajax POST in Laravel - ajax

Question

Please can someone provide a simple example for ajax in laravel 5.1. I have tried everything and still no success. Tried the other solutions here but no luck, maybe it is my copy of laravel, I really don't understand. I just want to see how its done correctly. Please help me out. Thanks.
Route: Route::post('/signin', 'UserController#ajax');
<form action="signin" method="POST" id="form1">
<input type="hidden" name="_token" value="{{ csrf_token() }}">
<fieldset>
<p><label for="email">E-mail address</label></p>
<p><input type="email" value="{{ old('email') }}" onBlur="if(this.value=='')this.value='mail#address.com'" onFocus="if(this.value=='mail#address.com')this.value=''" name="email"></p> <!-- JS because of IE support; better: placeholder="mail#address.com" -->
<p><label for="password">Password</label></p>
<p><input type="password" name='password' value="password" onBlur="if(this.value=='')this.value='password'" onFocus="if(this.value=='password')this.value=''"></p> <!-- JS because of IE support; better: placeholder="password" -->
<p><input type="submit" value="Login" name="submit" id="sign"></p>
</fieldset>
</form>
for the controller:
public function ajax(Request $request)
{
if(Request::ajax()) {
$data = Request::all();
print_r($data);
]);
}
And ajax:
$('#sign').click(function(event) {
$.ajaxSetup({
headers: { 'X-CSRF-Token' : $('meta[name=_token]').attr('content') }
});
var inputs = $('#form1').serialize();
$.ajax({
url: 'http://localhost/laravel/public/signin',
type: 'POST',
dataType: 'json',
data: inputs,
success: function (data) {
console.log(data);
}
})
return false;
});