diff --git a/src/Command/NormalizeCommand.php b/src/Command/NormalizeCommand.php
index 82de6440..60bcfae3 100644
--- a/src/Command/NormalizeCommand.php
+++ b/src/Command/NormalizeCommand.php
@@ -21,6 +21,7 @@
 use Ergebnis\Composer\Normalize\Exception;
 use Ergebnis\Composer\Normalize\Version;
 use Ergebnis\Json\Normalizer;
+use Ergebnis\Json\Normalizer\Format\JsonEncodeOptions;
 use Ergebnis\Json\Printer;
 use Localheinz\Diff;
 use Symfony\Component\Console;
@@ -189,6 +190,10 @@ protected function execute(
 
         $format = Normalizer\Format\Format::fromJson($json);
 
+        // Apply opinionated formatting rules to composer.json files.
+        $format = $format->withHasFinalNewLine(true);
+        $format = $format->withJsonEncodeOptions(JsonEncodeOptions::fromInt(\JSON_UNESCAPED_SLASHES | \JSON_UNESCAPED_UNICODE));
+
         if (null !== $indent) {
             $format = $format->withIndent($indent);
         }
diff --git a/test/Integration/Command/NormalizeCommand/Json/Valid/ExtraSlashes/ShouldBeRemoved/Test.php b/test/Integration/Command/NormalizeCommand/Json/Valid/ExtraSlashes/ShouldBeRemoved/Test.php
new file mode 100644
index 00000000..f0afefe1
--- /dev/null
+++ b/test/Integration/Command/NormalizeCommand/Json/Valid/ExtraSlashes/ShouldBeRemoved/Test.php
@@ -0,0 +1,78 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * Copyright (c) 2018-2023 Andreas Möller
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE.md file that was distributed with this source code.
+ *
+ * @see https://github.com/ergebnis/composer-normalize
+ */
+
+namespace Ergebnis\Composer\Normalize\Test\Integration\Command\NormalizeCommand\Json\Valid\ExtraSlashes\ShouldBeRemoved;
+
+use Ergebnis\Composer\Normalize\Test\Integration;
+use Ergebnis\Composer\Normalize\Test\Util;
+use Symfony\Component\Console;
+
+/**
+ * @internal
+ *
+ * @covers \Ergebnis\Composer\Normalize\Command\NormalizeCommand
+ * @covers \Ergebnis\Composer\Normalize\NormalizePlugin
+ *
+ * @uses \Ergebnis\Composer\Normalize\Version
+ */
+final class Test extends Integration\Command\NormalizeCommand\AbstractTestCase
+{
+    /**
+     * @dataProvider \Ergebnis\Composer\Normalize\Test\DataProvider\Command\NormalizeCommandProvider::commandInvocation()
+     */
+    public function testSucceeds(Util\CommandInvocation $commandInvocation): void
+    {
+        $scenario = self::createScenario(
+            $commandInvocation,
+            __DIR__ . '/fixture',
+        );
+
+        $initialState = $scenario->initialState();
+
+        self::assertComposerJsonFileExists($initialState);
+        self::assertComposerLockFileNotExists($initialState);
+
+        $application = self::createApplicationWithNormalizeCommandAsProvidedByNormalizePlugin();
+
+        $input = new Console\Input\ArrayInput($scenario->consoleParameters());
+
+        $output = new Console\Output\BufferedOutput();
+
+        $exitCode = $application->run(
+            $input,
+            $output,
+        );
+
+        self::assertExitCodeSame(0, $exitCode);
+
+        $expected = \sprintf(
+            'Successfully normalized %s.',
+            $scenario->composerJsonFileReference(),
+        );
+
+        self::assertStringContainsString($expected, $output->fetch());
+
+        $currentState = $scenario->currentState();
+
+        self::assertComposerJsonFileModified($initialState, $currentState);
+        self::assertComposerLockFileNotExists($currentState);
+
+        $newContent = $currentState->composerJsonFile()->contents();
+
+        self::assertStringNotContainsString('"vendor\/package-one":', $newContent);
+        self::assertStringNotContainsString('"vendor\/package-two":', $newContent);
+
+        self::assertStringContainsString('"vendor/package-one":', $newContent);
+        self::assertStringContainsString('"vendor/package-two":', $newContent);
+    }
+}
diff --git a/test/Integration/Command/NormalizeCommand/Json/Valid/ExtraSlashes/ShouldBeRemoved/fixture/composer.json b/test/Integration/Command/NormalizeCommand/Json/Valid/ExtraSlashes/ShouldBeRemoved/fixture/composer.json
new file mode 100644
index 00000000..4d9e84f7
--- /dev/null
+++ b/test/Integration/Command/NormalizeCommand/Json/Valid/ExtraSlashes/ShouldBeRemoved/fixture/composer.json
@@ -0,0 +1,10 @@
+{
+  "license": "MIT",
+  "type": "library",
+  "_comment": "This composer.json is valid according to a lax validation, a composer.lock is not present, and composer.json is not yet normalized.",
+  "require": {
+    "php": "^8.1",
+    "vendor\/package-one": "^1.0",
+    "vendor/package-two": "^1.0"
+  }
+}