Packages

Response builders, content negotiation, and HTTP caching for the Fetch API

Semantic helpers that build Response objects for JSON APIs and redirects

Base class for clients of a remote HTTP API: one origin, path-relative verb methods, shared hooks

Offset and keyset pagination with parameter parsing and Link headers

Server-Timing measurements collected per request and written to a response header

Router middleware that turns a thrown Response into the request's response

Read the client IP from a Cloudflare Workers request

Read a User-Agent string into its browser, engine, operating system and device

OAuth 2.0 and OpenID Connect client for any runtime that speaks Request and Response

JWT payload classes and the keys that sign them

Passkeys on both sides: a one-call WebAuthn browser API and a relying party that verifies the ceremonies

SAML 2.0 service provider: verify a signed assertion, build the requests and metadata around it

Web Crypto primitives — hashing, HMAC, tokens, TOTP, AES-GCM — plus scrypt passwords

Sign and verify Standard Webhooks deliveries, reporting every failure as a typed value

Validate, assert and generate UUIDs behind a branded UUID type

Type-safe TypeID values: a UUID and the prefix that names what it identifies

GitHub Flavored Markdown: parse to a typed AST, transform it, write it back

YAML reading and writing over a documented subset, shaped after the built-in JSON object

XML parser and serializer for RSS-style feeds

Read a served page: fetch or parse HTML, then query it by role and accessible name

RSS 2.0 feed builder and parser

Atom 1.0 feed parser and builder

JSON Feed 1.1 builder and parser

One feed API over RSS, Atom and JSON Feed, with conditional fetching and autodiscovery

Read and write OPML subscription lists

Read and write the sitemap protocol: collect URLs, or fetch a published sitemap

Distill the article out of a web page: fetch under bounds, score the candidates, sanitize what is left

Cache contract with adapters for memory and Cloudflare KV

Cache tags, purging and cache-status reads for Cloudflare Workers Cache

A remix/session SessionStorage backed by a Cloudflare Workers KV store

A remix/data-table DatabaseDriver backed by Cloudflare D1

A remix/data-table database driver backed by a Cloudflare Durable Object's SQL storage

Styled, accessible remix/ui components rendered as server HTML

Utility-first styling for remix/ui, composed from small, terse mixins

Lucide icons as remix/ui components, one tree-shakeable export per icon

Language detection, i18next instances and translated-markup components

Canonical URLs, typed schema.org structured data and head metadata

Syntax highlighting that returns tokens rather than markup, with a markdown walk visitor and a stylesheet keyed to the token types

Maps a route to a module imported on the first request that reaches it

Declared background jobs dispatched over a pluggable queue backend

Cron schedules with zone-aware occurrences and descriptors

One wide event per Worker invocation, attached at the router and the job dispatcher

Adapter-based rate limiting with standard response headers

Feature flag evaluation implementing the OpenFeature specification

Flag evaluation engine: typed targeting rules, percentage splits and pluggable stores

Vendor-neutral billing: one provider contract every payment platform is reached through, plus a webhook endpoint that verifies and deduplicates deliveries

Transport-agnostic transactional email with pluggable transports and remix/ui rendering

Cloudflare for SaaS custom-hostname client: register, poll and delete customer domains

Model Context Protocol servers as remix/router actions, served over stateless Streamable HTTP

Result type for error handling

Shared TypeScript types

Zone-aware date operations with Intl-only formatting

Typed duration strings converted to milliseconds or seconds

English inflection, Chicago title case, slugs and grapheme-safe text

SemVer 2.0.0 parsing, precedence ordering and range-free version comparisons

URL-like Location class for URL paths without an origin

Standard Schema validation utilities

Executable specification runner for .spec files

Seeded generation of believable people, places, prose, numbers and identifiers

In-memory, behavior-accurate Cloudflare binding mocks for tests