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Cloudflare Development and Security
A global edge network for DNS, caching, protection and lightweight compute in front of or instead of an origin server.
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What Cloudflare is
Cloudflare runs a large global network that sits between users and your application. Most teams meet it first as DNS, a CDN and DDoS and bot protection, then discover the platform behind it: Workers for edge compute, R2 for object storage, KV and D1 for edge data, and Pages for static and full-stack sites.
Putting an application behind Cloudflare changes where work happens. Cached content is served near the user, abusive traffic is filtered before it reaches your origin, and small pieces of logic can run at the edge instead of on a central server.
Suitability
And when it is not. Choosing the wrong tool costs more than any implementation detail.
Good fit for
- Public sites and APIs that need caching, DDoS protection and a web application firewall in front of the origin
- Reducing origin load and latency for globally distributed audiences
- Lightweight edge logic such as redirects, header handling, A/B routing and request validation
- Object storage where egress cost matters, since R2 does not charge for egress the way some alternatives do
Consider alternatives for
- Applications that need the full Node.js runtime, native modules or long CPU-heavy tasks, which exceed what edge Workers are built for
- Relational workloads with large datasets and complex queries, where the edge data products are not a substitute for a full database
- Cases where an aggressive cache could serve stale or personalised content to the wrong user without careful rules
In practice
01
DNS, CDN and protection
Putting production sites behind Cloudflare with sensible cache rules, TLS settings and firewall policies, so traffic spikes and abusive requests are absorbed before the origin.
02
Edge logic with Workers
Small, fast request handlers for redirects, authentication checks and routing that are better placed near the user than on a central server.
03
Storage and static delivery
R2 and Pages for asset delivery and static sites where simple, cheap global distribution is the goal.
Considerations
Practical notes from running this in production.
- 01
Cache configuration is where most mistakes happen. Caching a personalised or authenticated response can leak one user's content to another, so cache rules need explicit review.
- 02
Workers run in a constrained runtime with CPU time and memory limits, and not every Node.js package works. Check dependencies against the runtime before committing to the approach.
- 03
Edge data products have different consistency and size characteristics from a traditional database. Understand them before treating them as a backend.
- 04
Changing DNS and proxy settings affects the whole site. Rollout should be staged and reversible, with a plan for the origin to remain reachable if the proxy misbehaves.
- 05
Real client IPs, TLS modes and header forwarding need configuring correctly at the origin, or logging, rate limiting and security checks silently see Cloudflare instead of the visitor.
FAQ
Do we need Cloudflare if we already have a CDN?
Not necessarily. Cloudflare is worth considering when you want caching, DNS, a web application firewall and DDoS protection from one place, or edge compute. If your hosting already provides what you need, adding another layer should be justified by a specific requirement.
Can Cloudflare Workers replace our backend?
For small, latency-sensitive handlers and APIs, yes. For applications that need a full runtime, heavy computation or a rich relational database, a conventional backend remains the right base, with Workers handling edge tasks around it.
Will Cloudflare make our site faster?
It can, mainly by caching static and cacheable content close to users and reducing origin load. Gains depend on what is cacheable and how the origin is configured, so we measure before and after instead of assuming.
Is it safe to put our whole site behind the proxy?
It is common and generally safe when configured carefully: cache rules that exclude personalised content, correct origin settings and a staged rollout. We test those points rather than flipping the switch for everything at once.
How long does a Cloudflare development project take?
It depends on scope. A focused first release is usually weeks rather than months, while larger platforms are delivered in phases. We give a written estimate after a short discovery conversation and agree milestones before work starts.
By industry
Where we apply Cloudflare. Tiles marked "Guide" open a dedicated write-up; the rest open the industry page.
Let’s talk about your Cloudflare project
Tell us what you are trying to build or fix. We will come back with scope, approach and an honest view on cost and timeline.