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Cloudflare Workers KV

Cloudflare Workers KV

Globally distributed key‑value storage for serverless apps

Our Verdict

Best for

Serverless edge apps needing ultra‑low read latency key‑value storage

Skip if

Apps requiring strong consistency or complex query capabilities

What is Cloudflare Workers KV?

Cloudflare Workers KV provides a low‑latency, globally replicated key‑value store that integrates seamlessly with Cloudflare Workers. It lets developers store and retrieve data at the edge, reducing round‑trip time and improving performance for web applications. The service offers automatic replication across Cloudflare’s data centers, built‑in versioning, and configurable expiration, making it ideal for caching, feature flags, and user session data without managing traditional databases.

SpecificationsAI-estimated

free tier✅ Yes
uptime sla99.99%
datacenter regionsGlobal (300+ locations)

Key Features of Cloudflare Workers KV

Data is automatically replicated to over 300 Cloudflare edge locations worldwide.
Read latency is typically under 10 ms for users near any Cloudflare data center.
Writes are versioned, allowing you to retrieve previous values if needed.
Each key can have an optional TTL, automatically expiring stale data.
The KV API is accessible directly from Workers scripts with a few lines of code.
Supports atomic compare‑and‑set operations for safe concurrent updates.
Provides built‑in namespace isolation for multi‑tenant applications.
Integrates with Cloudflare’s caching layer for seamless edge caching.

Use Cases for Cloudflare Workers KV

1

Static Site Asset Cache

Store pre‑rendered HTML, CSS, or JSON for instant edge delivery.

2

Feature Flag Store

Enable or disable features per user or region without redeploying code.

3

Session & Token Storage

Persist short‑lived session tokens close to the user for fast authentication.

4

Configuration Management

Serve environment‑specific config files directly from the edge.

Pros & Cons of Cloudflare Workers KV

Pros

  • Ultra‑low read latency globally
  • Zero operational overhead – fully managed
  • Simple key‑value API works in any language
  • Free tier includes generous storage and requests

Cons

  • Eventual consistency may delay write propagation
  • Limited query capabilities – only key lookups
  • Higher costs at large scale compared to self‑hosted solutions

Frequently Asked Questions

How many reads per second can Workers KV handle?

Workers KV is designed for high throughput; typical workloads see millions of reads per second across the network, with no hard per‑second limit.

Is data encrypted at rest?

Yes, all KV data is encrypted at rest using Cloudflare’s internal encryption mechanisms.

Can I delete a namespace?

Yes, you can delete an entire KV namespace via the Cloudflare dashboard or API, which permanently removes all stored keys.

What consistency model does KV use?

KV provides eventual consistency for writes; reads may return stale data for a short period after a write.

Pricing Overview

View full pricing →
Freemium

Free

Free

Paid

Pay as you go

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About the Product

Unclaimed Listing
Platforms
Target AudienceDevelopers building serverless edge applications

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Tags

Edge ComputingServerlessKey-Value StoreGlobal ReplicationLow LatencyCache

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