What is the best way to upload large files to R2?

For files larger than 100MB, use the multipart upload patterns provided by this skill to ensure reliability, parallelization, and resumability.

Can I generate presigned URLs with this skill?

Yes, it includes implementation details using the aws4fetch library to generate secure, time-limited URLs for direct client uploads and downloads without exposing secrets.

Does R2 support S3-compatible APIs?

Yes, R2 is fully S3-compatible. This skill focuses on the native Workers R2 API for maximum performance, but also supports S3 API patterns via AWS SDKs.

How do I prevent CORS errors in the browser?

You must configure a CORS policy in your R2 bucket settings. This skill provides the correct JSON structure for AllowedOrigins and AllowedMethods to resolve browser access issues.

Cloudflare R2 Object Storage

Name: Cloudflare R2 Object Storage
Author: jezweb

byjezweb

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117

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Cloud Infrastructure

Manages Cloudflare R2 object storage with optimized patterns for Workers API integration, multipart uploads, and secure presigned URLs.

This skill provides specialized guidance for implementing and managing Cloudflare R2, the S3-compatible object storage service. It offers standardized implementation patterns for the Workers API, enabling developers to efficiently handle object uploads, downloads, and metadata management. The skill also covers advanced scenarios such as large-scale multipart uploads, secure presigned URL generation for client-side access, and troubleshooting common storage errors like CORS failures and quota limits, ensuring high-performance storage solutions at the edge.

Key Features

01Pre-configured CORS and bucket metadata templates for browser-based workflows

02Robust error handling and exponential backoff retry logic for transient storage issues

03Secure server-side generation of presigned URLs for direct client access

04Comprehensive Workers API patterns for object manipulation (put, get, head, delete, list)

05117 GitHub stars

06Optimized multipart upload logic for handling files larger than 100MB

Use Cases

01Building serverless media upload platforms with zero egress fees

02Generating time-limited download links for private digital assets

03Implementing automated data backups and static site hosting on Cloudflare's edge

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add jezweb/claude-skills cloudflare-r2

For use in Claude.ai and ChatGPT

Download Skill