Learn CLOUDFLARE-WORKERS with Real Code Examples

Workers execute code on Cloudflare’s edge network, reducing latency by running near users.

Supports multiple languages via WebAssembly (Wasm) including JavaScript, TypeScript, Rust, and C/C++.

Designed for serverless applications without managing servers or infrastructure.

Integrates with Cloudflare’s services like KV storage, Durable Objects, and R2 storage.

Ideal for building APIs, middleware, bots, and high-performance edge logic.

Function-as-a-Service (FaaS) model at edge locations

HTTP request/response handling

KV storage for serverless state

Durable Objects for consistent state across requests

Routing via Cloudflare Workers Routes and Workers Sites

Worker - deployed serverless function

Route - URL pattern that triggers the worker

KV - global key-value storage

Durable Object - consistent state object across requests

Wrangler - CLI tool to build, test, and deploy Workers

src/ - source code

wrangler.toml - project configuration

package.json - dependencies for JS/TS projects

dist/ - compiled or built output

tests/ - unit and integration tests

Write function code in JS/TS/Rust

Configure `wrangler.toml` with project details

Define routes and triggers

Test locally with `wrangler dev`

Deploy to Cloudflare edge network via `wrangler publish`

Beginner: simple HTTP response worker

Intermediate: API gateway or middleware

Advanced: KV/Durable Object-backed microservices

Expert: Multi-worker orchestration with edge caching

Auditor: monitor performance and edge latency

Cloudflare Workers vs AWS Lambda: Workers run at edge nodes globally, Lambda is region-based

Workers vs Fission: Workers run on Cloudflare edge, Fission runs on Kubernetes

Workers vs Fastly Compute@Edge: Both edge serverless, different providers

Workers vs Micronaut: Micronaut is full-stack framework, Workers is FaaS at the edge

Workers vs Node.js server: Node.js requires server hosting, Workers run serverless at edge

2017 – Cloudflare Workers initial launch

2018 – Added KV storage

2019 – Durable Objects announced

2020 – Expanded language support and edge routing

2021–2025 – Continuous improvements in performance, scaling, and observability

Worker - edge-deployed serverless function

Route - URL pattern triggering worker

KV - global key-value storage

Durable Object - stateful object at edge

Wrangler - CLI tool for building and deploying Workers