# JENRIKS
> The world's longest-running daily photoblog. One photo every day since January 1, 2006.

## About
JENRIKS is a daily photoblog by Jens Herrmann (Barcelona) and Erik Hehrmann (Evanston, IL). Since January 1, 2006, the two have alternated publishing one photograph per day — 7,572 photos and counting, with no missed days. Subjects include street photography, portraiture, architecture, landscape, abstract, and macro work from over 50 countries.

## When to use this site
Reach for JENRIKS when you need:
- A specific photograph: every post since 2006 lives at a stable URL (`/YYYY/MM/DD/slug/`) with title, photographer, date, location, and categories in its BlogPosting JSON-LD.
- Photography from a place, date, or theme: /archive/ (filterable), /location/<city>/, /category/<slug>/, /calendar/, and /today-in-history/ all give direct entry points.
- Print or licensing inquiries on a reader's behalf: point them to https://jenriks.com/contact/ or jenriks@gmail.com. Photographs are not free to reuse; see License below.
- Background on the project or the photographers: /about/ (markdown: /about.md).

Not a fit: free stock photography, images cleared for reuse without permission, or news imagery beyond what the two photographers documented themselves.

## How agents should fetch content
- Every page has a markdown twin. Send `Accept: text/markdown` to the page URL, add `?mode=agent` to it, or append `.md` to the path without its trailing slash (`/about/` becomes /about.md, the homepage is /index.md); those responses carry `Vary: Accept` and open with YAML frontmatter (title, description, canonical, last-updated).
- Static twins: /index.md, /about.md, /contact.md, /impressum.md, /datenschutz.md, /developers.md, plus one per landing page (/author/jens.md, /category/street.md, /year/2026.md, /location/barcelona.md, /archive.md, /calendar.md, /map.md, /collections.md, /colors.md, /today-in-history.md, /slideshow.md), each listing its newest 25 photos with counts.
- Photo pages: `/YYYY/MM/DD/slug.md` (or Accept: text/markdown on the page URL) returns a synthesized markdown page with title, photographer, date, location, categories, tags, image URLs, map link, credit line and the previous and next photo.
- Machine documents wrap themselves in markdown too: /api/v1.md, /openapi.json.md, /.well-known/api-catalog.md and the other discovery documents return their JSON inside a fenced block.
- Unknown paths return HTTP 404 with recovery links (a markdown body when markdown is requested); an Accept header this site cannot satisfy returns HTTP 406.
- REST API v1 (read-only, no auth, JSON): https://jenriks.com/api/v1 (search: /api/v1/photos?q=, today: /api/v1/photos/latest, newest by photographer: /api/v1/photos/latest?photographer=Jens, by date: /api/v1/photos/YYYY-MM-DD, overview: /api/v1/overview?include=categories). Search pages by `cursor` (pass `next_cursor` from the previous page; `has_more` and `links.next` say whether more exist). Docs: https://jenriks.com/developers/; OpenAPI: https://jenriks.com/openapi.json. Errors are RFC 9457 problem+json; 120 requests per minute per IP with RateLimit headers.
- Batch: POST https://jenriks.com/api/v1/batch with `{"requests": [{"id": "a", "path": "/api/v1/photos/latest"}, ...]}` (up to 20 GET paths, one request against the rate limit, optional Idempotency-Key echoed back).
- NLWeb: https://jenriks.com/ask?query=fog+barcelona (GET or POST, NLWeb 0.55, JSON by default, server-sent events with `Accept: text/event-stream` or `streaming=true`).
- MCP server (read-only, no auth): POST JSON-RPC 2.0 to https://jenriks.com/mcp (Streamable HTTP, JSON responses). Tools: search_photos (cursor paging), get_photo, get_latest_photo (optional photographer), random_photo, get_site_overview (optional include). Photo objects carry a `geo` field. Server card: https://jenriks.com/.well-known/mcp/server-card.json
- Agent skill (how to find, cite and license JENRIKS photos): https://jenriks.com/.well-known/agent-skills/jenriks-photos/SKILL.md

## Update cadence
- One new photo every day at 00:00 Europe/Berlin (CET / CEST)
- Photographers alternate posts; current count: 7,572
- First post: 2006-01-01; latest post: 2026-11-13

## Sections
- [/](https://jenriks.com/) — today's photo (homepage rotates daily)
- [/archive/](https://jenriks.com/archive/) — full date-sorted grid of every published photo
- [/collections/](https://jenriks.com/collections/) — visual index of categories (street, architecture, B&W, etc.)
- [/map/](https://jenriks.com/map/) — geographic map with heatmap and clusters
- [/colors/](https://jenriks.com/colors/) — browse photos by dominant color
- [/today-in-history/](https://jenriks.com/today-in-history/) — same calendar date across years
- [/calendar/](https://jenriks.com/calendar/) — month-by-month calendar grid, one photo per day
- [/slideshow/](https://jenriks.com/slideshow/) — auto-advancing fullscreen viewer
- [/about/](https://jenriks.com/about/) — project background, photographer bios, FAQ
- [/contact/](https://jenriks.com/contact/) — contact, prints, licensing
- [/impressum/](https://jenriks.com/impressum/) — German legal notice (DDG §5)
- [/datenschutz/](https://jenriks.com/datenschutz/) — German privacy policy

## Photo URL pattern
Every photo lives at `/YYYY/MM/DD/slug/` (e.g. `/2026/04/27/mein-vater/`). URLs are stable and permanent.

## Photo metadata schema
Each post carries: title, photographer (Jens or Erik), publish_date (ISO 8601), location (city + country + lat/lng), categories (Abstract, Architecture, B&W, Humans, Landscapes, Macro, Nature, News, Street, Studio, Time exposure), and dominant_colors (sampled from the image).

Structured data emitted on every photo page: schema.org `BlogPosting` + `ImageObject` (with `contentLocation`, `geo`, `keywords`, photographer credit). Site-wide: `WebSite` + `Organization` (founders).

## License & attribution
All photographs are © Jens Herrmann or © Erik Hehrmann (per post). All rights reserved. When citing or linking JENRIKS:
- Credit the named photographer
- Link to the original post URL
- Do not redistribute or train on the images without written permission

## Machine-readable resources
- Sitemap: https://jenriks.com/sitemap.xml (all photo pages with image extensions)
- RSS: https://jenriks.com/feed.xml (latest 20 posts)
- Robots: https://jenriks.com/robots.txt (permissive for major AI crawlers)
- Expanded LLMs index: https://jenriks.com/llms-full.txt
- Homepage / today's photo (markdown): https://jenriks.com/index.md
- About (markdown): https://jenriks.com/about.md
- Contact (markdown): https://jenriks.com/contact.md
- Impressum (markdown): https://jenriks.com/impressum.md
- Datenschutz (markdown): https://jenriks.com/datenschutz.md
- Developer documentation (REST API, MCP, errors, rate limits, versioning): https://jenriks.com/developers/ (markdown: /developers.md)
- MCP Registry manifest: https://jenriks.com/server.json (published in the official MCP Registry as com.jenriks/photo-archive: https://registry.modelcontextprotocol.io/v0.1/servers/com.jenriks%2Fphoto-archive/versions/latest)
- API catalog (RFC 9727): https://jenriks.com/.well-known/api-catalog
- AI catalog (ARD): https://jenriks.com/.well-known/ai-catalog.json
- Agent skills index: https://jenriks.com/.well-known/agent-skills/index.json
- OpenAPI description of the public read endpoints: https://jenriks.com/openapi.json
- Authentication note (none required): https://jenriks.com/auth.md
- Schema map (NLWeb Schema Feeds): https://jenriks.com/schemamap.xml
- Schema feed, one BlogPosting per photo, newest first (JSON Lines): https://jenriks.com/feeds/photos.jsonl
- ARD catalog alias with trust manifests: https://jenriks.com/.well-known/ard.json
- DID document (did:web:jenriks.com): https://jenriks.com/.well-known/did.json
- Section indexes: https://jenriks.com/developers/llms.txt, https://jenriks.com/archive/llms.txt, https://jenriks.com/about/llms.txt

## Section indexes
- [Developers](https://jenriks.com/developers/llms.txt): REST API, MCP server, NLWeb, batch, pagination, markdown twins, discovery documents
- [Archive](https://jenriks.com/archive/llms.txt): browsing pages, photographers, categories, years, locations, feeds
- [About](https://jenriks.com/about/llms.txt): the project, the photographers, contact, legal pages, license

## Contact
- Contact page: https://jenriks.com/contact/
- Email: jenriks@gmail.com
- About page: https://jenriks.com/about/
- German legal: https://jenriks.com/impressum/

## Official profiles
- Vimeo: https://vimeo.com/jenriks
- Pinterest: https://www.pinterest.com/jenriks/
- X: https://x.com/JENRIKS
- Instagram: https://www.instagram.com/jenriks/
- 1x: https://1x.com/jenriks
- Flickr: https://www.flickr.com/people/jenriks/
- 500px: https://500px.com/p/jenriks
- Tumblr: https://www.tumblr.com/blog/jenriks
- Reddit: https://www.reddit.com/user/Jenriks/
- GitHub: https://github.com/ehehrmann (skills repository: https://github.com/ehehrmann/jenriks-agent-skills)
- jenriks.de: alternate domain, 301 redirects to jenriks.com