diff --git a/public/app/edit.php b/public/app/edit.php
new file mode 100644
index 0000000..0be7152
--- /dev/null
+++ b/public/app/edit.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+use Solid\App\BlogPost\Application\UseCase\EditBlogPostUseCase;
+use Solid\App\BlogPost\Domain\Model\BlogPostNormalizer;
+use Solid\App\BlogPost\Infrastructure\Persistence\FileStorage;
+use Solid\App\BlogPost\Presentation\Controller\EditAction;
+use Solid\App\BlogPost\Presentation\Renderer\HtmlRenderer;
+use Solid\App\BlogPost\Presentation\Renderer\JsonRenderer;
+use Solid\App\BlogPost\Presentation\Renderer\RenderContainer;
+
+require __DIR__.'/../../vendor/autoload.php';
+
+$normalizer = new BlogPostNormalizer();
+$storage = new FileStorage($normalizer, __DIR__.'/../../var/data/blog_post.dat');
+$useCase = new EditBlogPostUseCase($storage);
+$renderContainer = new RenderContainer([
+    'html' => new HtmlRenderer(),
+    'json' => new JsonRenderer($normalizer),
+]);
+$format = $_GET['format'] ?? 'html';
+
+$action = new EditAction($useCase, $renderContainer->get($format));
+$action((int) ($_GET['id'] ?? 0), $_GET['author'] ?? null, $_GET['title'] ?? null, $_GET['content'] ?? null, $format);
diff --git a/public/app/list.php b/public/app/list.php
new file mode 100644
index 0000000..97edd97
--- /dev/null
+++ b/public/app/list.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+use Solid\App\BlogPost\Application\UseCase\ListBlogPostUseCase;
+use Solid\App\BlogPost\Domain\Model\BlogPostNormalizer;
+use Solid\App\BlogPost\Infrastructure\Persistence\FileStorage;
+use Solid\App\BlogPost\Presentation\Controller\ListAction;
+use Solid\App\BlogPost\Presentation\Renderer\HtmlRenderer;
+use Solid\App\BlogPost\Presentation\Renderer\JsonRenderer;
+use Solid\App\BlogPost\Presentation\Renderer\RenderContainer;
+
+require __DIR__.'/../../vendor/autoload.php';
+
+$normalizer = new BlogPostNormalizer();
+$storage = new FileStorage($normalizer, __DIR__.'/../../var/data/blog_post.dat');
+$useCase = new ListBlogPostUseCase($storage);
+$renderContainer = new RenderContainer([
+    'html' => new HtmlRenderer(),
+    'json' => new JsonRenderer($normalizer),
+]);
+$format = $_GET['format'] ?? 'html';
+
+$action = new ListAction($useCase, $renderContainer->get($format));
+$action($format);
diff --git a/public/app/new.php b/public/app/new.php
new file mode 100644
index 0000000..cbca489
--- /dev/null
+++ b/public/app/new.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+use Solid\App\BlogPost\Application\UseCase\NewBlogPostUseCase;
+use Solid\App\BlogPost\Domain\Model\BlogPostNormalizer;
+use Solid\App\BlogPost\Infrastructure\Persistence\FileStorage;
+use Solid\App\BlogPost\Presentation\Controller\NewAction;
+use Solid\App\BlogPost\Presentation\Renderer\HtmlRenderer;
+use Solid\App\BlogPost\Presentation\Renderer\JsonRenderer;
+use Solid\App\BlogPost\Presentation\Renderer\RenderContainer;
+
+require __DIR__.'/../../vendor/autoload.php';
+
+$normalizer = new BlogPostNormalizer();
+$storage = new FileStorage($normalizer, __DIR__.'/../../var/data/blog_post.dat');
+$useCase = new NewBlogPostUseCase($storage);
+$renderContainer = new RenderContainer([
+    'html' => new HtmlRenderer(),
+    'json' => new JsonRenderer($normalizer),
+]);
+$format = $_GET['format'] ?? 'html';
+
+$action = new NewAction($useCase, $renderContainer->get($format));
+$action(random_int(0, 999999), $_GET['author'] ?? null, $_GET['title'] ?? null, $_GET['content'] ?? null, $format);
diff --git a/public/app/show.php b/public/app/show.php
new file mode 100644
index 0000000..b207c2d
--- /dev/null
+++ b/public/app/show.php
@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+use Solid\App\BlogPost\Application\UseCase\FindBlogPostUseCase;
+use Solid\App\BlogPost\Domain\Model\BlogPostNormalizer;
+use Solid\App\BlogPost\Infrastructure\Persistence\FileStorage;
+use Solid\App\BlogPost\Presentation\Controller\ShowAction;
+use Solid\App\BlogPost\Presentation\Renderer\HtmlRenderer;
+use Solid\App\BlogPost\Presentation\Renderer\JsonRenderer;
+use Solid\App\BlogPost\Presentation\Renderer\RenderContainer;
+
+require __DIR__.'/../../vendor/autoload.php';
+
+$normalizer = new BlogPostNormalizer();
+$storage = new FileStorage($normalizer, __DIR__.'/../../var/data/blog_post.dat');
+$useCase = new FindBlogPostUseCase($storage);
+$renderContainer = new RenderContainer([
+    'html' => new HtmlRenderer(),
+    'json' => new JsonRenderer($normalizer),
+]);
+$format = $_GET['format'] ?? 'html';
+
+$action = new ShowAction($useCase, $renderContainer->get($format));
+$action((int) ($_GET['id'] ?? 0), $format);
diff --git a/src/App/BlogPost/Application/UseCase/EditBlogPostUseCase.php b/src/App/BlogPost/Application/UseCase/EditBlogPostUseCase.php
new file mode 100644
index 0000000..c12acab
--- /dev/null
+++ b/src/App/BlogPost/Application/UseCase/EditBlogPostUseCase.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace Solid\App\BlogPost\Application\UseCase;
+
+use Solid\App\BlogPost\Domain\Model\BlogPost;
+use Solid\App\BlogPost\Domain\Model\Storage;
+
+final class EditBlogPostUseCase
+{
+    public function __construct(
+        private readonly Storage $storage,
+        private readonly RandomWords $rand = new RandomWords(),
+    ) {
+    }
+
+    public function execute(int $id, ?string $author, ?string $title, ?string $content): BlogPost
+    {
+        $blogPost = $this->storage->get($id);
+        $blogPost->update(
+            $author ?? $this->rand->get('s'),
+            $title ?? $this->rand->get('m'),
+            $content ?? $this->rand->get('l')
+        );
+        $this->storage->save($blogPost);
+
+        return $blogPost;
+    }
+
+}
diff --git a/src/App/BlogPost/Application/UseCase/FindBlogPostUseCase.php b/src/App/BlogPost/Application/UseCase/FindBlogPostUseCase.php
new file mode 100644
index 0000000..ec48af6
--- /dev/null
+++ b/src/App/BlogPost/Application/UseCase/FindBlogPostUseCase.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace Solid\App\BlogPost\Application\UseCase;
+
+use Solid\App\BlogPost\Domain\Model\BlogPost;
+use Solid\App\BlogPost\Domain\Model\Storage;
+
+final class FindBlogPostUseCase
+{
+    public function __construct(private readonly Storage $storage)
+    {
+    }
+
+    public function execute(int $id): BlogPost
+    {
+        return $this->storage->get($id);
+    }
+}
diff --git a/src/App/BlogPost/Application/UseCase/ListBlogPostUseCase.php b/src/App/BlogPost/Application/UseCase/ListBlogPostUseCase.php
new file mode 100644
index 0000000..eb54184
--- /dev/null
+++ b/src/App/BlogPost/Application/UseCase/ListBlogPostUseCase.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace Solid\App\BlogPost\Application\UseCase;
+
+use Solid\App\BlogPost\Domain\Model\Storage;
+
+final class ListBlogPostUseCase
+{
+    public function __construct(private readonly Storage $storage)
+    {
+    }
+
+    public function execute(): iterable
+    {
+        return $this->storage->getAll();
+    }
+}
diff --git a/src/App/BlogPost/Application/UseCase/NewBlogPostUseCase.php b/src/App/BlogPost/Application/UseCase/NewBlogPostUseCase.php
new file mode 100644
index 0000000..61c142b
--- /dev/null
+++ b/src/App/BlogPost/Application/UseCase/NewBlogPostUseCase.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace Solid\App\BlogPost\Application\UseCase;
+
+use Solid\App\BlogPost\Domain\Model\BlogPost;
+use Solid\App\BlogPost\Domain\Model\Storage;
+
+final class NewBlogPostUseCase
+{
+    public function __construct(
+        private readonly Storage $storage,
+        private readonly RandomWords $rand = new RandomWords(),
+    ) {
+    }
+
+    public function execute(int $id, ?string $author, ?string $title, ?string $content): BlogPost
+    {
+        $blogPost = new BlogPost(
+            $id,
+            $author ?? $this->rand->get('s'),
+            $title ?? $this->rand->get('m'),
+            $content ?? $this->rand->get('l'),
+        );
+        $this->storage->save($blogPost);
+
+        return $blogPost;
+    }
+}
diff --git a/src/App/BlogPost/Application/UseCase/RandomWords.php b/src/App/BlogPost/Application/UseCase/RandomWords.php
new file mode 100644
index 0000000..6ff5660
--- /dev/null
+++ b/src/App/BlogPost/Application/UseCase/RandomWords.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace Solid\App\BlogPost\Application\UseCase;
+
+final class RandomWords
+{
+    public function get(string $size): string
+    {
+        $times = match ($size) {
+            's' => 2,
+            'm' => 3,
+            'l' => 10,
+        };
+        $string = '';
+        for ($i = 0; $i < $times; ++$i) {
+            $string .= $this->randWord().' ';
+        }
+
+        return trim($string);
+    }
+
+    private function randWord(): string
+    {
+        $word = array_merge(range('a', 'z'), range('A', 'Z'));
+        shuffle($word);
+        $length = random_int(7, 12);
+
+        return substr(implode($word), 0, $length);
+    }
+}
diff --git a/src/App/BlogPost/Domain/Model/BlogPost.php b/src/App/BlogPost/Domain/Model/BlogPost.php
new file mode 100644
index 0000000..16498cf
--- /dev/null
+++ b/src/App/BlogPost/Domain/Model/BlogPost.php
@@ -0,0 +1,62 @@
+<?php
+
+namespace Solid\App\BlogPost\Domain\Model;
+
+use DateTimeImmutable;
+
+final class BlogPost
+{
+    private DateTimeImmutable $createdAt;
+    private ?DateTimeImmutable $updatedAt = null;
+
+    public function __construct(
+        private int $id,
+        private string $author,
+        private string $title,
+        private string $content,
+    ) {
+        $this->createdAt = new DateTimeImmutable();
+    }
+
+    public function update(
+        ?string $author = null,
+        ?string $title = null,
+        ?string $content = null,
+    ): void {
+        $this->author = $author ?? $this->author;
+        $this->title = $title ?? $this->title;
+        $this->content = $content ?? $this->content;
+        $this->updatedAt = new DateTimeImmutable();
+    }
+
+    public function getId(): int
+    {
+        return $this->id;
+    }
+
+    public function getAuthor(): string
+    {
+        return $this->author;
+    }
+
+    public function getTitle(): string
+    {
+        return $this->title;
+    }
+
+    public function getContent(): string
+    {
+        return $this->content;
+    }
+
+    public function getCreatedAt(): DateTimeImmutable
+    {
+        return $this->createdAt;
+    }
+
+    public function getUpdatedAt(): ?DateTimeImmutable
+    {
+        return $this->updatedAt;
+    }
+}
+
diff --git a/src/App/BlogPost/Domain/Model/BlogPostNormalizer.php b/src/App/BlogPost/Domain/Model/BlogPostNormalizer.php
new file mode 100644
index 0000000..96a10a2
--- /dev/null
+++ b/src/App/BlogPost/Domain/Model/BlogPostNormalizer.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace Solid\App\BlogPost\Domain\Model;
+
+use DateTimeImmutable;
+
+final class BlogPostNormalizer implements Normalizer
+{
+    public function normalize(BlogPost $blogPost): array
+    {
+        return [
+            'id' => $blogPost->getId(),
+            'author' => $blogPost->getAuthor(),
+            'title' => $blogPost->getTitle(),
+            'content' => $blogPost->getContent(),
+            'created_at' => $blogPost->getCreatedAt()->format('Y-m-d H:i:s'),
+            'updated_at' => $blogPost->getUpdatedAt()?->format('Y-m-d H:i:s'),
+        ];
+    }
+
+    public function denormalize(array $data): BlogPost
+    {
+        $blogPost = new BlogPost($data['id'], $data['author'], $data['title'], $data['content']);
+        $this->setTimestampProperties($blogPost, $data['created_at'], $data['updated_at']);
+
+        return $blogPost;
+    }
+
+    private function setTimestampProperties(BlogPost $blogPost, string $created, ?string $updated): void
+    {
+        $createdAt = new \ReflectionProperty($blogPost, 'createdAt');
+        $createdAt->setAccessible(true);
+        $createdAt->setValue($blogPost, new DateTimeImmutable($created));
+        if (null !== $updated) {
+            $updatedAt = new \ReflectionProperty($blogPost, 'updatedAt');
+            $updatedAt->setAccessible(true);
+            $updatedAt->setValue($blogPost, new DateTimeImmutable($updated));
+        }
+    }
+}
diff --git a/src/App/BlogPost/Domain/Model/Normalizer.php b/src/App/BlogPost/Domain/Model/Normalizer.php
new file mode 100644
index 0000000..11000b2
--- /dev/null
+++ b/src/App/BlogPost/Domain/Model/Normalizer.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace Solid\App\BlogPost\Domain\Model;
+
+use DateTimeImmutable;
+
+interface Normalizer
+{
+    /**
+     * @return array{id: int, title: string, content: string, author: string, createdAt: DateTimeImmutable, updatedAt: ?DateTimeImmutable}
+     */
+    public function normalize(BlogPost $blogPost): array;
+
+    /**
+     * @param array{id: int, title: string, content: string, author: string, createdAt: DateTimeImmutable, updatedAt: ?DateTimeImmutable} $data
+     */
+    public function denormalize(array $data): BlogPost;
+}
diff --git a/src/App/BlogPost/Domain/Model/Storage.php b/src/App/BlogPost/Domain/Model/Storage.php
new file mode 100644
index 0000000..776084a
--- /dev/null
+++ b/src/App/BlogPost/Domain/Model/Storage.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace Solid\App\BlogPost\Domain\Model;
+
+interface Storage
+{
+    public function get(int $id): BlogPost;
+
+    /**
+     * @return iterable<int, BlogPost>
+     */
+    public function getAll(): iterable;
+
+    public function save(BlogPost $blogPost): void;
+}
diff --git a/src/App/BlogPost/Infrastructure/Persistence/FileStorage.php b/src/App/BlogPost/Infrastructure/Persistence/FileStorage.php
new file mode 100644
index 0000000..80994e2
--- /dev/null
+++ b/src/App/BlogPost/Infrastructure/Persistence/FileStorage.php
@@ -0,0 +1,62 @@
+<?php
+
+namespace Solid\App\BlogPost\Infrastructure\Persistence;
+
+use DateTimeImmutable;
+use InvalidArgumentException;
+use Solid\App\BlogPost\Domain\Model\BlogPost;
+use Solid\App\BlogPost\Domain\Model\Normalizer;
+use Solid\App\BlogPost\Domain\Model\Storage;
+
+class FileStorage implements Storage
+{
+    /**
+     * @var array<int, array{id: int, title: string, content: string, author: string, createdAt: DateTimeImmutable, updatedAt: ?DateTimeImmutable}>
+     */
+    private array $collection = [];
+
+    public function __construct(
+        private readonly Normalizer $normalizer,
+        private readonly string $filePath,
+    ) {
+        if (!is_readable($filePath)) {
+            throw new InvalidArgumentException('Cannot read file '.$filePath);
+        }
+        $content = file_get_contents($filePath);
+        if (empty($content)) {
+            $content = serialize([]);
+        }
+        $this->collection = unserialize($content, ['allowed_classes' => false]);
+    }
+
+    public function get(int $id): BlogPost
+    {
+        foreach ($this->collection as $item) {
+            if ($id === $item['id']) {
+                return $this->normalizer->denormalize($item);
+            }
+        }
+        throw new InvalidArgumentException('Cannot find blog post with id: '.$id);
+    }
+
+    public function getAll(): iterable
+    {
+        return array_map([$this->normalizer, 'denormalize'], $this->collection);
+    }
+
+    public function save(BlogPost $blogPost): void
+    {
+        $found = false;
+        foreach ($this->collection as $key => $item) {
+            if ($blogPost->getId() === $item['id']) {
+                $this->collection[$key] = $this->normalizer->normalize($blogPost);
+                $found = true;
+                break;
+            }
+        }
+        if (!$found) {
+            $this->collection[] = $this->normalizer->normalize($blogPost);
+        }
+        file_put_contents($this->filePath, serialize($this->collection));
+    }
+}
diff --git a/src/App/BlogPost/Presentation/Controller/EditAction.php b/src/App/BlogPost/Presentation/Controller/EditAction.php
new file mode 100644
index 0000000..97673a5
--- /dev/null
+++ b/src/App/BlogPost/Presentation/Controller/EditAction.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace Solid\App\BlogPost\Presentation\Controller;
+
+use Solid\App\BlogPost\Application\UseCase\EditBlogPostUseCase;
+use Solid\App\BlogPost\Presentation\Renderer\Renderer;
+
+final class EditAction
+{
+    public function __construct(
+        private readonly EditBlogPostUseCase $useCase,
+        private readonly Renderer $renderer,
+    ) {
+    }
+
+    public function __invoke(int $id, ?string $author, ?string $title, ?string $content, string $format = 'html'): void
+    {
+        $blogPost = $this->useCase->execute($id, $author, $title, $content);
+
+        if ('json' === $format) {
+            header('Content-type: application/json');
+        } else {
+            echo '<h1>Blog post</h1>';
+        }
+
+        echo $this->renderer->render($blogPost);
+    }
+}
diff --git a/src/App/BlogPost/Presentation/Controller/ListAction.php b/src/App/BlogPost/Presentation/Controller/ListAction.php
new file mode 100644
index 0000000..d466302
--- /dev/null
+++ b/src/App/BlogPost/Presentation/Controller/ListAction.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace Solid\App\BlogPost\Presentation\Controller;
+
+use Solid\App\BlogPost\Application\UseCase\ListBlogPostUseCase;
+use Solid\App\BlogPost\Presentation\Renderer\Renderer;
+
+final class ListAction
+{
+    public function __construct(
+        private readonly ListBlogPostUseCase $useCase,
+        private readonly Renderer $renderer,
+    ) {
+    }
+
+    public function __invoke(string $format = 'html'): void
+    {
+        $blogPosts = $this->useCase->execute();
+
+        if ('json' === $format) {
+            $count = count($blogPosts);
+            header('Content-type: application/json');
+            echo '[';
+            foreach ($blogPosts as $num => $blogPost) {
+                echo $this->renderer->render($blogPost);
+                if ($num < $count - 1) {
+                    echo ',';
+                }
+            }
+            echo ']';
+
+            return;
+        }
+
+        echo '<h1>Blog post list</h1>';
+        foreach ($blogPosts as $blogPost) {
+            echo $this->renderer->render($blogPost);
+        }
+    }
+}
diff --git a/src/App/BlogPost/Presentation/Controller/NewAction.php b/src/App/BlogPost/Presentation/Controller/NewAction.php
new file mode 100644
index 0000000..72c1edd
--- /dev/null
+++ b/src/App/BlogPost/Presentation/Controller/NewAction.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace Solid\App\BlogPost\Presentation\Controller;
+
+use Solid\App\BlogPost\Application\UseCase\NewBlogPostUseCase;
+use Solid\App\BlogPost\Presentation\Renderer\Renderer;
+
+final class NewAction
+{
+    public function __construct(
+        private readonly NewBlogPostUseCase $useCase,
+        private readonly Renderer $renderer,
+    ) {
+    }
+
+    public function __invoke(int $id, ?string $author, ?string $title, ?string $content, string $format = 'html'): void
+    {
+        $blogPost = $this->useCase->execute($id, $author, $title, $content);
+
+        if ('json' === $format) {
+            header('Content-type: application/json');
+        } else {
+            echo '<h1>New blog post</h1>';
+        }
+
+        echo $this->renderer->render($blogPost);
+    }
+}
diff --git a/src/App/BlogPost/Presentation/Controller/ShowAction.php b/src/App/BlogPost/Presentation/Controller/ShowAction.php
new file mode 100644
index 0000000..7936b81
--- /dev/null
+++ b/src/App/BlogPost/Presentation/Controller/ShowAction.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace Solid\App\BlogPost\Presentation\Controller;
+
+use Solid\App\BlogPost\Application\UseCase\FindBlogPostUseCase;
+use Solid\App\BlogPost\Presentation\Renderer\Renderer;
+
+final class ShowAction
+{
+    public function __construct(
+        private readonly FindBlogPostUseCase $useCase,
+        private readonly Renderer $renderer,
+    ) {
+    }
+
+    public function __invoke(int $id, string $format = 'html'): void
+    {
+        $blogPost = $this->useCase->execute($id);
+
+        if ('json' === $format) {
+            header('Content-type: application/json');
+        } else {
+            echo '<h1>Blog post</h1>';
+        }
+
+        echo $this->renderer->render($blogPost);
+    }
+}
diff --git a/src/App/BlogPost/Presentation/Renderer/HtmlRenderer.php b/src/App/BlogPost/Presentation/Renderer/HtmlRenderer.php
new file mode 100644
index 0000000..e76a427
--- /dev/null
+++ b/src/App/BlogPost/Presentation/Renderer/HtmlRenderer.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace Solid\App\BlogPost\Presentation\Renderer;
+
+use DateTimeImmutable;
+use Solid\App\BlogPost\Domain\Model\BlogPost;
+
+final class HtmlRenderer implements Renderer
+{
+    public function render(BlogPost $blogPost): string
+    {
+        $placeholders = [
+            $blogPost->getId(),
+            $blogPost->getAuthor(),
+            $blogPost->getTitle(),
+            $this->format($blogPost->getCreatedAt()),
+            $this->format($blogPost->getUpdatedAt()),
+            $blogPost->getContent(),
+        ];
+
+        return \vsprintf($this->getTemplate(), $placeholders);
+    }
+
+    private function format(?DateTimeImmutable $date): string
+    {
+        return null === $date ? '' : $date->format('Y-m-d H:i:s');
+    }
+
+    private function getTemplate(): string
+    {
+        return <<<'HTML'
+            <article>
+                <p>ID %s</p>
+                <p>Author %s</p>
+                <p>Title %s</p>
+                <p>Created %s</p>
+                <p>Updated %s</p>
+                <div>%s</div>
+            </article>
+        HTML;
+    }
+}
diff --git a/src/App/BlogPost/Presentation/Renderer/JsonRenderer.php b/src/App/BlogPost/Presentation/Renderer/JsonRenderer.php
new file mode 100644
index 0000000..175d9af
--- /dev/null
+++ b/src/App/BlogPost/Presentation/Renderer/JsonRenderer.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Solid\App\BlogPost\Presentation\Renderer;
+
+use JsonException;
+use Solid\App\BlogPost\Domain\Model\BlogPost;
+use Solid\App\BlogPost\Domain\Model\Normalizer;
+
+final class JsonRenderer implements Renderer
+{
+    public function __construct(private readonly Normalizer $normalizer)
+    {
+    }
+
+    /**
+     * @throws JsonException
+     */
+    public function render(BlogPost $blogPost): string
+    {
+        return json_encode($this->normalizer->normalize($blogPost), JSON_THROW_ON_ERROR);
+    }
+}
diff --git a/src/App/BlogPost/Presentation/Renderer/RenderContainer.php b/src/App/BlogPost/Presentation/Renderer/RenderContainer.php
new file mode 100644
index 0000000..65d45d3
--- /dev/null
+++ b/src/App/BlogPost/Presentation/Renderer/RenderContainer.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace Solid\App\BlogPost\Presentation\Renderer;
+
+use InvalidArgumentException;
+
+final class RenderContainer
+{
+    /**
+     * @param array<string, Renderer> $renderers
+     */
+    public function __construct(private readonly array $renderers)
+    {
+    }
+
+    public function get(string $format): Renderer
+    {
+        if (!isset($this->renderers[$format])) {
+            throw new InvalidArgumentException('Unsupported format: '.$format);
+        }
+
+        return $this->renderers[$format];
+    }
+}
diff --git a/src/App/BlogPost/Presentation/Renderer/Renderer.php b/src/App/BlogPost/Presentation/Renderer/Renderer.php
new file mode 100644
index 0000000..040ebf6
--- /dev/null
+++ b/src/App/BlogPost/Presentation/Renderer/Renderer.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace Solid\App\BlogPost\Presentation\Renderer;
+
+use Solid\App\BlogPost\Domain\Model\BlogPost;
+
+interface Renderer
+{
+    public function render(BlogPost $blogPost): string;
+}