Cloudflare Features

Edge compute platform that runs JavaScript/TypeScript on Cloudflare's global network.

All experiments run on Workers, providing:

• Global deployment in 300+ cities
• Sub-millisecond cold starts
• Zero-config scaling
• Request/Response manipulation
• Standard Web APIs (fetch, URL, etc.)

Used in: All experiments

Serverless AI inference at the edge with built-in models. Run language models directly from Workers: - Text generation and summarization - No GPU infrastructure required - Pay-per-inference pricing - Multiple model options Used in: - AI Website Summary

• GitHub Repo Explainer - Cloud AI Proxy

Headless browser automation powered by Puppeteer on the edge.

Capture screenshots, generate PDFs, and interact with web pages:

• Full Chrome browser in Workers
• Screenshot and PDF generation
• Page metrics and DOM evaluation
• No browser infrastructure to manage

Used in:

• Screenshot API
• PDF API
• Page Metrics
• Rendered Text
• Browser Links

Streaming HTML parser for transforming HTML on the fly.

Parse and extract data from HTML without buffering:

• Streaming HTML transformation
• CSS selector-based parsing
• Low memory overhead
• Regex-based extraction patterns

Used in:

• Dependency Analyzer
• Website Metadata Extractor
• Website DevTools Inspector
• Website to API

SQLite database at the edge with global replication.

Serverless SQL for relational data:

• SQLite syntax and compatibility
• Automatic backups
• Read replication
• Schema migrations
• Low-latency queries from edge

Used in:

• Link Shortener (primary storage)

Global key-value store optimized for high-read workloads.

Distributed KV storage:

• Eventually consistent reads
• Global edge caching
• TTL support
• Ideal for read-heavy caching

Used in:

• Link Shortener (read-through cache)
• Cron Heartbeat (scheduled run metadata)
• Task Queue (enqueue/process stats)
• KV Notes (primary storage)

Object storage compatible with S3 APIs, with zero egress fees.

Store files and assets:

• S3-compatible API
• No egress charges
• Public and private buckets
• Custom metadata support
• Ideal for images, videos, files

Used in:

• R2 Storage

Strongly consistent state at the edge. Single-threaded objects with persistent storage for coordination, counters, sessions, and real-time apps.

Used in:

• Durable Counter

Scheduled Workers that run on a cron schedule without external schedulers.

Used in:

• Cron Heartbeat

Asynchronous message processing between Workers. Decouple HTTP requests from background work with producer/consumer handlers.

Used in:

• Task Queue

Global network with advanced request handling.

Access network-level information:

• Geolocation data (country, city, region)
• Data center (colo) information
• Request metadata
• TLS/SSL information

Used in:

• Where Am I
• Is It Down
• Response Headers

Standards-based HTTP client with edge optimizations. Make HTTP requests from the edge: - Standard Web Fetch API - Automatic retries and failover - Connection pooling - Header manipulation Used in: Most experiments for fetching external content

Edge response cache for storing fetch responses in the same colo.

Cache origin responses with caches.default:

• Read-through caching patterns
• Per-colo cache storage
• TTL via response headers

Used in:

• Edge Cache

Cryptography at the edge via crypto.subtle.

Hash and sign data without external libraries:

• SHA digests
• HMAC and signing (extensible pattern)
• Standards-based Web Crypto

Used in:

• Crypto Hash

Bidirectional messaging from Workers using WebSocketPair.

Upgrade HTTP to WebSocket and push messages from the edge:

• Real-time echo and chat patterns
• Works with browser and CLI clients
• Foundation for Durable Objects WebSockets

Used in:

• WebSocket Echo