Laravel 5.4 $error not showing/flashed - php

Question

I have a fresh installation of Laravel 5.4 using vagrant for windows.
Now as I followed through the tuts in laracast and tried the form validation it was all fine but the $errors variable just doesn't contain any error messages at all.
snippet is from PostsController
public function store()
{
$this->validate(request(), [
'title' => 'required|unique:posts,title|min:3',
'body' => 'required'
]);
Post::firstOrCreate(request(['title', 'body']));
return redirect()->route('create-post');
}
snippet from my create.blade.php
#extends('layout')
#section('content')
<main role="main" class="container">
<div class="row">
<div class="col-md-8 blog-main">
<h3 class="pb-3 mb-4 font-italic border-bottom">
Create Post Form
</h3>
<form action="/api/posts" method="POST">
{{ csrf_field() }}
<div class="form-group">
<label for="title">Title</label>
<input type="text" class="form-control" id="title" placeholder="Title" name="title" value="">
<small class="text-danger">{{ $errors->first('title') }}</small>
</div>
<div class="form-group">
<label for="body">Content</label>
<textarea class="form-control" id="body" rows="5" name="body" placeholder="Contents Here.." value=""></textarea>
<small class="text-danger">{{ $errors->first('body') }}</small>
</div>
<div class="form-group">
<button class="btn btn-primary" type="submit">Submit</button>
</div>
<div class="form-group">
<div class="alert alert-{{ $errors->any() ? 'danger' : 'default' }}">
<ul>
#foreach($errors->all() as $error)
<li>{{ $error }}</li>
#endforeach
</ul>
</div>
</div>
</form>
</div>
#include('partials.sidebar')
</div>
</main>
#endsection
and the result after validation failed
Is there something that I am missing or somethings wrong?
Edit
here's the snippet of my route:
Route::get('/', 'PostsController#index');
Route::get('/posts/{post}', 'PostsController#show');
Route::get('/create', function() {
return view('posts.create');
})->name('create-post');
Route::post('/posts', 'PostsController#store');

Answer 1

Found the answer.
Since that it's 5.4 I didnt notice that all the web.php was under a middleware called web
that that includes with it the \Illuminate\View\Middleware\ShareErrorsFromSession::class
my api/posts was on the api middleware thats why there's no session shared whatsoever.
also this link helped solved this.
Laravel 5.2 $errors not appearing in Blade

Answer 2

You are passing Request object in the validator. You need to change the validation code a bit:
$this->validate(request()->all(), [
'title' => 'required|unique:posts,title|min:3',
'body' => 'required'
]);
Read more in the docs.

Answer 3

You can validate this way
$this->validate($request, [
'title' => 'required|unique:posts,title|min:3',
'body' => 'required'
]);
I hope this will work.