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check_buckets.js

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+require('dotenv').config();
+const { S3Client, ListBucketsCommand } = require('@aws-sdk/client-s3');
+
+const client = new S3Client({
+  region: 'auto',
+  endpoint: `https://${process.env.R2_ACCOUNT_ID}.r2.cloudflarestorage.com`,
+  credentials: {
+    accessKeyId: process.env.R2_ACCESS_KEY_ID,
+    secretAccessKey: process.env.R2_SECRET_ACCESS_KEY,
+  },
+});
+
+(async () => {
+  try {
+    const data = await client.send(new ListBucketsCommand({}));
+    console.log('Buckets:', data.Buckets);
+  } catch (err) {
+    console.error('Error:', err);
+  }
+})();