Undefined variable $credentials, tried several solutions but couldn’t understand my mistake

I’m a beginner, learning Laravel. I was trying to create a web page which will show me my login Info(like email and password) once I log in. In my controller part I passed values using route parameter, but when I call it in blade, it shows

ErrorException Undefined variable $credentials (View: …..new projectNewLearnresourcesviewswelcome.blade.php)

My database has users table( email and password columns (which will be shown only), along with name,id, timestamps).

my LoginController

public function loginProcess(Request $request)
{
        $this->validate($request, [
            'email' => 'required|email',
            'password' => 'required|min:4',
        ]);

        $credentials = $request->except(['_token']);
        if (auth()->attempt($credentials)) {
            return redirect()->route('welcome', [$credentials->email]);
        }
        else{
        $this->setErrorMessage('Invalid!');
        return redirect()->back();
        }

my routes

Route::get('/', function () {
return view('login');});

Route::view('/welcome', 'welcome')->middleware('auth')->name('welcome');
Route::post('/login', [AppHttpControllersLoginController::class, 'loginProcess'])->middleware('guest')->name('login');
Route::get('/login', [AppHttpControllersLoginController::class, 'loginProcess'])->middleware('guest');

my welcome.blade.php

         @extends('master')
         @section('contents')
             @include('partials.jumbotron')
         @stop
         @section('content')

        <h3 class="pb-3 mb-4 font-italic border-bottom">
            {{$credentials->email}}
        </h3>

        <div class="blog-post">
            <h2 class="blog-post-title">Sample blog post</h2>

        </div>

        <nav class="blog-pagination">
            <a class="btn btn-outline-primary" href="#">Older</a>
            <a class="btn btn-outline-secondary disabled" href="#">Newer</a>
        </nav>


         @stop

Where am I making the mistake? Thanks in advance.

Answer

You are making it pretty hard on yourself. Let us start by changing

Route::view('/welcome', 'welcome')->middleware('auth')->name('welcome');

to

Route::get('/welcome', function() {
   $user = auth()->user();
   return view('welcome', compact('user'));
})->middleware('auth')->name('welcome');

Now in login process simply change

if (auth()->attempt($credentials)) {
            return redirect()->route('welcome', [$credentials->email]);
        }

to

if (auth()->attempt($credentials)) {
            return redirect()->route('welcome');
        }

Now inside your blade file you can simple use

{{ $user->email }}