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Docs
API
Utilities
Components
Demos
GitHub

Changelog
Philosophy
Showcase
Sponsor

Getting started

What these are
The sdxc command
Build an app
Deploy your app
How it fits together

Packages à la carte

Install and pin
Your first handler
Use the packages outside Remix
Add packages to an existing app
Pick packages by problem

Recipes

Build a blog
Build a SaaS
Build a public JSON API
Build an app agents can use
Build a command-line tool
Add a contact form
Invite a teammate
Add a newsletter sign-up
Let users export their data
Import a large file
Add profile pictures
Send a weekly digest
Get paged when a dependency is down
Watch your domains
Show link previews
Publish an events calendar
Build a documentation site with search
Give your users API keys
Send signed webhooks

The sdxc command

Start a project
Generate files
Make a controller
Make a middleware
Make a validator
Make a job
Make a model
Make a migration
Make a factory
Make a service
Make a policy
Make an initializer
Make an email
Make an MCP tool or resource
Make a command
Make a Durable Object
Make a binding
Make a secret
Undo a make
Scaffold a resource
Copy UI components
Upgrade
Check a project
List routes
Inspect a project
Run your app's commands
Deploy
Configuration
Errors and FAQ
Glossary

Conventions

Result everywhere
Standard Schema validation
Subpath exports
Naming
Identifiers and secrets
Expressions over mutation
Log through the invocation
Errors as responses
Platform first

Building Remix apps

Wire the router: middleware, context and services
Validate forms and route params
Build the interface with remix/component
Translate your app
SEO, sitemaps and robots.txt
Dates, text and identifiers
Canonical URLs, lazy routes and header fields
Read nested query strings and forms
Draw QR codes
Build a landing page
Load content as readers reach it
Keyboard shortcuts
Calendars, date ranges and time zones
Build a search dialog
Draw social card images
Accept PNG avatars and draw placeholders
Read the visitor's browser and device

HTTP APIs

Build a JSON API with problem details
Describe your API with OpenAPI
Idempotent writes and JSON Merge Patch
Write a typed API client
Paginate lists
Address JSON with JSON Pointer
Parse and write Link headers
Accept JSON Patch updates
Query JSON with JSONPath
Expand URI templates
Hash and sign JSON in canonical form
Encode and decode CBOR

Identity & security

Sign in with OpenID Connect
Add passkeys
Receive and send webhooks
Protect forms from bots and abuse
Security headers and CSP
Issue and verify JWTs
Hash, sign and encrypt with Web Crypto
Add two-factor sign-in with TOTP
Custom domains for your customers
Enterprise sign-on with SAML and SCIM
Fetch URLs a stranger chose
Client addresses and networks
Decide who can do what
Sign and verify HTTP requests
Sign files and security.txt with OpenPGP
Publish transparent statements with SCITT
Accept Privacy Pass tokens instead of a CAPTCHA

Data & background work

Cache on Cloudflare Workers
Query D1 and Durable Object SQL
Model your tables
Background jobs and cron
Send email
Feature flags
Charge for your app
Charge each request with x402
Import and export CSV
Retry on a growing delay
Rules your users write
Run a newsletter list
Know where visitors come from
Send alerts to chat and paging services
Send browser push notifications
Import and export DNS zone files
Watch when a domain expires
Stream several files as a ZIP
Full-text search over SQLite
Stream JSON Lines
Check a domain's email authentication
Read and send mail over JMAP

Content & feeds

A markdown content pipeline
Publish RSS, Atom and JSON feeds
Join the IndieWeb: Webmention and Micropub
Publish calendar feeds
Read other people's pages
Generate reference docs from JSDoc
Federate a site with ActivityPub
Anchor, polish and lint markdown
Fill markdown templates with variables
Offer posts as EPUB ebooks
Generate PDF documents
Render TeX math
Draw diagrams from text
Load live regions into markdown
Embed YouTube videos in markdown
Set text as SVG paths
Draw charts as PNG images
Model events and tasks as JSCalendar
Offer and import contact cards

Operations & testing

Logs, traces and timings
Dependency health checks
Expose your app over MCP
Call an MCP server
Bridge Agents to a modern MCP server
Test your app
Test Workers apps
Generate believable test data
Write executable specs
Estimate what your Worker costs
Randomness you can replay
Build a command line
Use a package from the terminal
Your app's command line
Read configuration files
Edit source files

Releases

Versioning
Breaking changes
Corrected release notes
License
Changelog

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Written by Sergio Xalambrí. Follow @sergiodxa for new packages, or sponsor the work.

© 2026 Sergio Xalambrí. MIT licensed.

Philosophy
Maintenance
Security
Changelog
Sponsor
GitHub

Documentation

Getting started

What these are
The sdxc command
Build an app
Deploy your app
How it fits together

Packages à la carte

Install and pin
Your first handler
Use the packages outside Remix
Add packages to an existing app
Pick packages by problem

Recipes

Build a blog
Build a SaaS
Build a public JSON API
Build an app agents can use
Build a command-line tool
Add a contact form
Invite a teammate
Add a newsletter sign-up
Let users export their data
Import a large file
Add profile pictures
Send a weekly digest
Get paged when a dependency is down
Watch your domains
Show link previews
Publish an events calendar
Build a documentation site with search
Give your users API keys
Send signed webhooks

The sdxc command

Start a project
Generate files
Make a controller
Make a middleware
Make a validator
Make a job
Make a model
Make a migration
Make a factory
Make a service
Make a policy
Make an initializer
Make an email
Make an MCP tool or resource
Make a command
Make a Durable Object
Make a binding
Make a secret
Undo a make
Scaffold a resource
Copy UI components
Upgrade
Check a project
List routes
Inspect a project
Run your app's commands
Deploy
Configuration
Errors and FAQ
Glossary

Conventions

Result everywhere
Standard Schema validation
Subpath exports
Naming
Identifiers and secrets
Expressions over mutation
Log through the invocation
Errors as responses
Platform first

Building Remix apps

Wire the router: middleware, context and services
Validate forms and route params
Build the interface with remix/component
Translate your app
SEO, sitemaps and robots.txt
Dates, text and identifiers
Canonical URLs, lazy routes and header fields
Read nested query strings and forms
Draw QR codes
Build a landing page
Load content as readers reach it
Keyboard shortcuts
Calendars, date ranges and time zones
Build a search dialog
Draw social card images
Accept PNG avatars and draw placeholders
Read the visitor's browser and device

HTTP APIs

Build a JSON API with problem details
Describe your API with OpenAPI
Idempotent writes and JSON Merge Patch
Write a typed API client
Paginate lists
Address JSON with JSON Pointer
Parse and write Link headers
Accept JSON Patch updates
Query JSON with JSONPath
Expand URI templates
Hash and sign JSON in canonical form
Encode and decode CBOR

Identity & security

Sign in with OpenID Connect
Add passkeys
Receive and send webhooks
Protect forms from bots and abuse
Security headers and CSP
Issue and verify JWTs
Hash, sign and encrypt with Web Crypto
Add two-factor sign-in with TOTP
Custom domains for your customers
Enterprise sign-on with SAML and SCIM
Fetch URLs a stranger chose
Client addresses and networks
Decide who can do what
Sign and verify HTTP requests
Sign files and security.txt with OpenPGP
Publish transparent statements with SCITT
Accept Privacy Pass tokens instead of a CAPTCHA

Data & background work

Cache on Cloudflare Workers
Query D1 and Durable Object SQL
Model your tables
Background jobs and cron
Send email
Feature flags
Charge for your app
Charge each request with x402
Import and export CSV
Retry on a growing delay
Rules your users write
Run a newsletter list
Know where visitors come from
Send alerts to chat and paging services
Send browser push notifications
Import and export DNS zone files
Watch when a domain expires
Stream several files as a ZIP
Full-text search over SQLite
Stream JSON Lines
Check a domain's email authentication
Read and send mail over JMAP

Content & feeds

A markdown content pipeline
Publish RSS, Atom and JSON feeds
Join the IndieWeb: Webmention and Micropub
Publish calendar feeds
Read other people's pages
Generate reference docs from JSDoc
Federate a site with ActivityPub
Anchor, polish and lint markdown
Fill markdown templates with variables
Offer posts as EPUB ebooks
Generate PDF documents
Render TeX math
Draw diagrams from text
Load live regions into markdown
Embed YouTube videos in markdown
Set text as SVG paths
Draw charts as PNG images
Model events and tasks as JSCalendar
Offer and import contact cards

Operations & testing

Logs, traces and timings
Dependency health checks
Expose your app over MCP
Call an MCP server
Bridge Agents to a modern MCP server
Test your app
Test Workers apps
Generate believable test data
Write executable specs
Estimate what your Worker costs
Randomness you can replay
Build a command line
Use a package from the terminal
Your app's command line
Read configuration files
Edit source files

Releases

Versioning
Breaking changes
Corrected release notes
License
Changelog

No page title matches. Try search instead.

Can’t find it? Contact us