--- title: Rate limiting with Cloudflare KV | daily.dev description: A practical guide to implementing rate limiting on Cloudflare Workers using KV fixed-window counters. Covers the core counter logic, caller identity keying... canonical: https://daily.dev/posts/rate-limiting-with-cloudflare-kv-liexjenmf twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Rate limiting with Cloudflare KV | daily.dev og:description: A practical guide to implementing rate limiting on Cloudflare Workers using KV fixed-window counters. Covers the core counter logic, caller identity keying... og:url: https://daily.dev/posts/rate-limiting-with-cloudflare-kv-liexjenmf og:image: https://api.daily.dev/og/posts/LiExJEnMF.png og:image:alt: Rate limiting with Cloudflare KV og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Rate limiting with Cloudflare KV **[Flavio Copes](https://daily.dev/sources/flaviocopes)** · 4 min read · 0 upvotes · 0 comments ## Summary A practical guide to implementing rate limiting on Cloudflare Workers using KV fixed-window counters. Covers the core counter logic, caller identity keying (combining anon token + IP via CF-Connecting-IP), automatic key cleanup with expirationTtl, fail-open error handling, and when to use Durable Objects instead. Acknowledges KV's eventual consistency makes this suitable for soft abuse protection rather than precise billing quotas. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Cloudflare KV: a key-value store for your Workers](https://daily.dev/posts/cloudflare-kv-a-key-value-store-for-your-workers-h2hh3gizy) · Flavio Copes · 0 upvotes · 0 comments --- Tags: [#security](https://daily.dev/tags/security), [#javascript](https://daily.dev/tags/javascript), [#cloudflare](https://daily.dev/tags/cloudflare) [View this post on daily.dev](https://daily.dev/posts/rate-limiting-with-cloudflare-kv-liexjenmf) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Rate limiting with Cloudflare KV","url":"https://daily.dev/posts/rate-limiting-with-cloudflare-kv-liexjenmf","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/rate-limiting-with-cloudflare-kv-liexjenmf"},"datePublished":"2026-07-12T07:44:28.729Z","dateModified":"2026-07-12T07:44:46.035Z","description":"A practical guide to implementing rate limiting on Cloudflare Workers using KV fixed-window counters. Covers the core counter logic, caller identity keying...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/907c6c028f107fad7d0379f1571dde35?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/907c6c028f107fad7d0379f1571dde35?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Flavio Copes","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Flavio Copes","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/1f2dbd275797411bbd37bfdaaf0951a9","url":"https://daily.dev/sources/flaviocopes"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/rate-limiting-with-cloudflare-kv-liexjenmf","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"security,javascript,cloudflare","timeRequired":"PT4M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Flavio Copes","item":"https://daily.dev/sources/flaviocopes"},{"@type":"ListItem","position":3,"name":"Rate limiting with Cloudflare KV"}]} ```