diff --git a/src/commands/migrate.ts b/src/commands/migrate.ts
new file mode 100644
index 0000000..f6acd1d
--- /dev/null
+++ b/src/commands/migrate.ts
@@ -0,0 +1,45 @@
+import { Command } from 'commander';
+import * as fs from 'fs';
+import * as path from 'path';
+import * as prettier from 'prettier';
+import { parseEnvFile } from '../core/parser';
+import { parseSchemaFromEnv } from '../core/validator';
+
+export function createMigrateCommand(): Command {
+  const cmd = new Command('migrate');
+  
+  cmd
+    .description('Generate schema.json from existing .env file')
+    .option('-e, --env <path>', 'Path to .env file', '.env')
+    .option('-o, --output <path>', 'Output file path (schema.json if not specified)')
+    .action(async (options) => {
+      try {
+        const envPath = path.resolve(options.env);
+        
+        if (!fs.existsSync(envPath)) {
+          console.error(`Error: .env file not found at ${envPath}`);
+          process.exit(1);
+        }
+
+        const parsedEnv = parseEnvFile(envPath);
+        const schema = parseSchemaFromEnv(parsedEnv.flat);
+
+        const schemaJson = JSON.stringify(schema, null, 2);
+        const formattedJson = await prettier.format(schemaJson, { parser: 'json' });
+
+        const outputPath = options.output 
+          ? path.resolve(options.output) 
+          : path.join(process.cwd(), 'schema.json');
+
+        fs.writeFileSync(outputPath, formattedJson);
+        console.log(`✓ Schema generated at ${outputPath}`);
+        console.log('\nGenerated schema:');
+        console.log(formattedJson);
+      } catch (error) {
+        console.error('Error during migration:', (error as Error).message);
+        process.exit(1);
+      }
+    });
+
+  return cmd;
+}