01
@jdevalk/seo-graph-core
Pure TypeScript schema.org JSON-LD graph builder.
Typed piece builders, ID factory, graph assembler with deduplication. Framework-agnostic — works anywhere you can run Node.
SECTION III OPEN SOURCE · PLUGINS · PACKAGES MIT & GPL
The Workshop.
Building tools that make the web & the world better — from WordPress and EmDash plugins to Astro integrations, Schema infrastructure and club management software.
14
projects
5
npm packages
8
WP plugins
19yr
shipping
§ 01 · Astro
SEO & Schema.org for Astro.
A shared schema.org JSON-LD graph engine and an Astro integration — agent-ready SEO infrastructure for the modern web, all open source.
02
@jdevalk/astro-seo-graph
Astro integration for seo-graph-core.
Ships a <Seo> component, schema endpoint factories, a schema map for agent discovery, hreflang alternates, and Zod content helpers.
03
@jdevalk/astro-markdown-alternate
Markdown alternate links for Astro articles.
Injects <link rel="alternate" type="text/markdown"> into article pages at build time, making raw Markdown source discoverable by agents and crawlers.
§ 02 · EmDash
EmDash plugins.
Open-source plugins for the EmDash CMS — SEO, schema.org graph generation, and email delivery.
01
@jdevalk/emdash-plugin-seo
SEO plugin for EmDash CMS.
Uses seo-graph-core for JSON-LD graph generation, with EmDash-specific piece builders and metadata hooks.
02
@jdevalk/emdash-plugin-lettermint
Lettermint email provider plugin for EmDash CMS.
Connects EmDash to Lettermint for email delivery, with EmDash-native hooks for transactional sending.
§ 03 · WordPress
WordPress plugins.
I was the original author of Yoast SEO and most of its add-ons, and never really stopped coding on WordPress plugins.
№ 01
Progress Planner
My current main focus. A WordPress plugin that helps you plan and track your content and site maintenance progress.
№ 02
AAA Option Optimizer
Tracks autoloaded options usage and allows the user to optimize them — faster admin, faster frontend.
№ 03
Brand Assets
Stop chasing down requests for your logo and color codes by creating a Brand Assets page on your site.
№ 04
Comment Experience
WordPress' comment system is incomplete. This plugin adds the little tricks that make comments actually manageable.
№ 05
Comment Free Zone
For sites that don't need comments, this plugin removes every default entry point cleanly.
№ 06
Fewer Tags
Make sure tags are only live on your site when they actually add value — more than a few posts in them.
№ 07
Glossary
Clear definitions that show up exactly when and where readers need them, without breaking reading flow.
№ 08
XML Sitemaps for PDFs
If your site has a lot of PDFs, this Yoast SEO add-on is what you need to get them indexed.
§ 04 · Club management software · Open source · GPL · Self-hostable
Rondo.
From member management and dues to invoicing, VOG, and membership passes — Rondo automates your club processes and keeps everything in sync.
§ 05 · Elsewhere
Other projects.
I actively contribute to EmDash core, including per-collection sitemaps, breadcrumb support, and OG image handling. I also contribute to the software of some of the companies in our investment portfolio — read more about that on my about page, or at Emilia Capital.
On the tooling side: Quix is my Alfred workflow for running SEO checks, speed tests, and other web analysis tools on the current browser URL with a few keystrokes. I also maintain a library of Claude Code skills — reusable agent scripts that automate common dev and content workflows.