Whats is Cloudflare Worker?

A "Cloudflare Worker" is JavaScript you write that runs on Cloudflare's edge. A "Cloudflare Service Worker" is specifically a worker which handles HTTP traffic and is written against the Service Worker API. Currently, this is the only kind of worker we've implemented, but in the future we may introduce other worker types for certain specialized tasks.

It can do anything and everything. You're writing code, so the possibilities are infinite. Your Service Worker will intercept all HTTP requests destined for your domain, and can return any valid HTTP response. Your worker can make outgoing HTTP requests to any server on the public internet.

Technical Details

Cloudflare Workers are written in JavaScript, executed using the V8 JavaScript engine (from Google Chrome). It choosed JavaScript and V8 for two main reasons.

1. Security

The V8 JavaScript engine is arguably the most scrutinized code sandbox in the history of computing, and the Chrome security team is one of the best in the world. Moreover, Google pays massive bug bounties to anyone who can find a vulnerability. (That said, we have added additional layers of our own sandboxing on top of V8.)

2. Ubiquity

JavaScript is everywhere. Anyone building a web application already needs to know it: whereas their server could be written in a variety of languages, the client has to be JavaScript, because that's what browsers run.

Pricing

1. Free plan
The Workers Free plan makes it easy to experience the Workers ecosystem without a commitment. The Free plan provides access to Workers and Worker KV, giving you the tools to start building your service. Learn about the Free plan limits.

2. Paid plan
To avoid the Free plan limits, you can subscribe to the Workers Paid plan for a minimum $5 USD per month for an account.

Performance

Cloudflare Workers respond very quickly, typically in under 200 milliseconds, when cold starting. In contrast, both Lambda and Lambda@Edge functions can take over a second to respond from a cold start. The differences are largely due to the fact that Cloudflare Workers run on Chrome V8 rather than Node.

Feedback

What do you think about Cloudflare Worker? This product is used by 7 companies & 8 companies wants to use it in future.