Is it safe to generate R2 presigned URLs on the client side?

No. You must always generate presigned URLs on the server-side (using a Worker or backend) to avoid exposing your R2 access keys and secret keys.

What are the advantages of using R2 over S3?

Cloudflare R2 offers zero egress fees, deep integration with Cloudflare Workers, and full S3 API compatibility, making it significantly more cost-effective for high-bandwidth applications.

How do I fix CORS errors when uploading from a web browser?

CORS must be configured in the R2 Bucket settings in the Cloudflare Dashboard. You need to define allowed origins, methods, and headers to permit browser-based PUT or GET requests.

How do I handle files larger than 100MB in R2?

For files exceeding 100MB, use the multipart upload API. This skill provides patterns to initialize, upload parts (5MB-100MB each), and complete the transfer reliably.

Does this skill support the 2025 R2 updates?

Yes, it includes guidance on the latest features such as R2 SQL for Apache Iceberg, Pipelines for stream ingestion, and increased bucket limits.

Cloudflare R2 Object Storage

Name: Cloudflare R2 Object Storage
Author: jezweb

byjezweb

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클라우드 인프라

Integrates Cloudflare R2 into Claude Code for managing S3-compatible object storage, presigned URLs, and multipart uploads.

소개

This skill empowers Claude Code to interact efficiently with Cloudflare R2, providing specialized guidance for the Workers API, large-scale multipart uploads, and secure presigned URL generation. It includes production-ready implementation patterns for managing metadata, configuring CORS policies, and troubleshooting common storage errors. By leveraging this skill, developers can implement cost-effective, zero-egress storage solutions while staying up-to-date with the latest 2025 R2 features like SQL queries for Iceberg and event notifications.

주요 기능

Optimization patterns for metadata management and HTTP cache-control headers.
Advanced multipart upload management for handling files larger than 100MB.
Detailed CORS configuration guidance for browser-based storage access.
Secure server-side presigned URL generation patterns using aws4fetch.
91 GitHub stars
Comprehensive Workers API support for put, get, head, list, and delete operations.

사용 사례

Building scalable media upload pipelines with direct-to-bucket browser uploads.
Implementing secure, authenticated file sharing services using temporary presigned URLs.
Managing large asset distributions with zero egress fees and edge caching.

소개

주요 기능

Optimization patterns for metadata management and HTTP cache-control headers.
Advanced multipart upload management for handling files larger than 100MB.
Detailed CORS configuration guidance for browser-based storage access.
Secure server-side presigned URL generation patterns using aws4fetch.
91 GitHub stars
Comprehensive Workers API support for put, get, head, list, and delete operations.

사용 사례

Building scalable media upload pipelines with direct-to-bucket browser uploads.
Implementing secure, authenticated file sharing services using temporary presigned URLs.
Managing large asset distributions with zero egress fees and edge caching.