diff --git a/src/StaticPHP/Command/DumpExtensionsCommand.php b/src/StaticPHP/Command/DumpExtensionsCommand.php
new file mode 100644
index 00000000..4e1fb932
--- /dev/null
+++ b/src/StaticPHP/Command/DumpExtensionsCommand.php
@@ -0,0 +1,160 @@
+<?php
+
+declare(strict_types=1);
+
+namespace StaticPHP\Command;
+
+use StaticPHP\Util\FileSystem;
+use Symfony\Component\Console\Attribute\AsCommand;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputOption;
+
+#[AsCommand(name: 'dump-extensions', description: 'Determines the required php extensions')]
+class DumpExtensionsCommand extends BaseCommand
+{
+    protected bool $no_motd = true;
+
+    public function configure(): void
+    {
+        // path to project files or specific composer file
+        $this->addArgument('path', InputArgument::OPTIONAL, 'Path to project root', '.');
+        $this->addOption('format', 'F', InputOption::VALUE_REQUIRED, 'Parsed output format', 'default');
+        // output zero extension replacement rather than exit as failure
+        $this->addOption('no-ext-output', 'N', InputOption::VALUE_REQUIRED, 'When no extensions found, output default combination (comma separated)');
+        // no dev
+        $this->addOption('no-dev', null, null, 'Do not include dev dependencies');
+        // no spc filter
+        $this->addOption('no-spc-filter', 'S', null, 'Do not use SPC filter to determine the required extensions');
+    }
+
+    public function handle(): int
+    {
+        $path = FileSystem::convertPath($this->getArgument('path'));
+
+        $path_installed = FileSystem::convertPath(rtrim($path, '/\\') . '/vendor/composer/installed.json');
+        $path_lock = FileSystem::convertPath(rtrim($path, '/\\') . '/composer.lock');
+
+        $ext_installed = $this->extractFromInstalledJson($path_installed, !$this->getOption('no-dev'));
+        if ($ext_installed === null) {
+            if ($this->getOption('format') === 'default') {
+                $this->output->writeln('<comment>vendor/composer/installed.json load failed, skipped</comment>');
+            }
+            $ext_installed = [];
+        }
+
+        $ext_lock = $this->extractFromComposerLock($path_lock, !$this->getOption('no-dev'));
+        if ($ext_lock === null) {
+            $this->output->writeln('<error>composer.lock load failed</error>');
+            return static::FAILURE;
+        }
+
+        $extensions = array_unique(array_merge($ext_installed, $ext_lock));
+        sort($extensions);
+
+        if (empty($extensions)) {
+            if ($this->getOption('no-ext-output')) {
+                $this->outputExtensions(explode(',', $this->getOption('no-ext-output')));
+                return static::SUCCESS;
+            }
+            $this->output->writeln('<error>No extensions found</error>');
+            return static::FAILURE;
+        }
+
+        $this->outputExtensions($extensions);
+        return static::SUCCESS;
+    }
+
+    private function filterExtensions(array $requirements): array
+    {
+        return array_map(
+            fn ($key) => substr($key, 4),
+            array_keys(
+                array_filter($requirements, function ($key) {
+                    return str_starts_with($key, 'ext-');
+                }, ARRAY_FILTER_USE_KEY)
+            )
+        );
+    }
+
+    private function loadJson(string $file): array|bool
+    {
+        if (!file_exists($file)) {
+            return false;
+        }
+
+        $data = json_decode(file_get_contents($file), true);
+        if (!$data) {
+            return false;
+        }
+        return $data;
+    }
+
+    private function extractFromInstalledJson(string $file, bool $include_dev = true): ?array
+    {
+        if (!($data = $this->loadJson($file))) {
+            return null;
+        }
+
+        $packages = $data['packages'] ?? [];
+
+        if (!$include_dev) {
+            $packages = array_filter($packages, fn ($package) => !in_array($package['name'], $data['dev-package-names'] ?? []));
+        }
+
+        return array_merge(
+            ...array_map(fn ($x) => isset($x['require']) ? $this->filterExtensions($x['require']) : [], $packages)
+        );
+    }
+
+    private function extractFromComposerLock(string $file, bool $include_dev = true): ?array
+    {
+        if (!($data = $this->loadJson($file))) {
+            return null;
+        }
+
+        // get packages ext
+        $packages = $data['packages'] ?? [];
+        $exts = array_merge(
+            ...array_map(fn ($package) => $this->filterExtensions($package['require'] ?? []), $packages)
+        );
+
+        // get dev packages ext
+        if ($include_dev) {
+            $packages = $data['packages-dev'] ?? [];
+            $exts = array_merge(
+                $exts,
+                ...array_map(fn ($package) => $this->filterExtensions($package['require'] ?? []), $packages)
+            );
+        }
+
+        // get require ext
+        $platform = $data['platform'] ?? [];
+        $exts = array_merge($exts, $this->filterExtensions($platform));
+
+        // get require-dev ext
+        if ($include_dev) {
+            $platform = $data['platform-dev'] ?? [];
+            $exts = array_merge($exts, $this->filterExtensions($platform));
+        }
+
+        return $exts;
+    }
+
+    private function outputExtensions(array $extensions): void
+    {
+        if (!$this->getOption('no-spc-filter')) {
+            $extensions = parse_extension_list($extensions);
+        }
+        switch ($this->getOption('format')) {
+            case 'json':
+                $this->output->writeln(json_encode($extensions, JSON_PRETTY_PRINT));
+                break;
+            case 'text':
+                $this->output->writeln(implode(',', $extensions));
+                break;
+            default:
+                $this->output->writeln('<info>Required PHP extensions' . ($this->getOption('no-dev') ? ' (without dev)' : '') . ':</info>');
+                $this->output->writeln(implode(',', $extensions));
+        }
+    }
+}
diff --git a/src/StaticPHP/ConsoleApplication.php b/src/StaticPHP/ConsoleApplication.php
index 21e3ee8b..1fced54c 100644
--- a/src/StaticPHP/ConsoleApplication.php
+++ b/src/StaticPHP/ConsoleApplication.php
@@ -18,6 +18,7 @@ use StaticPHP\Command\Dev\PackLibCommand;
 use StaticPHP\Command\Dev\ShellCommand;
 use StaticPHP\Command\DoctorCommand;
 use StaticPHP\Command\DownloadCommand;
+use StaticPHP\Command\DumpExtensionsCommand;
 use StaticPHP\Command\DumpLicenseCommand;
 use StaticPHP\Command\ExtractCommand;
 use StaticPHP\Command\InstallPackageCommand;
@@ -65,6 +66,7 @@ class ConsoleApplication extends Application
             new ExtractCommand(),
             new SPCConfigCommand(),
             new DumpLicenseCommand(),
+            new DumpExtensionsCommand(),
             new ResetCommand(),
             new CheckUpdateCommand(),
             new MicroCombineCommand(),