How does PageSourceSearch know what janosh.dev is built with?

From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.

How far back does the history of janosh.dev go?

To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.

Can I see an older version of a script from janosh.dev?

Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.

Which other websites use the same tracking IDs as janosh.dev?

Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Site profile

janosh.dev

Built with @playpilot/tpi 8.40.0, @marimo-team/frontend 0.25.0, plausible, @event-calendar/build 5.14.1, @videojs/cdn 10.0.0-rc.3, @liip/liipgpt 3.14.0, p2p-media-loader-hlsjs 4.0.0. 5 pages and 152 stored files, last crawled 2026-10-03.

rank 1,947,193 7 libraries 2 identifiers 59 third-party hosts 1 crawl open the site

Technologies and libraries

Recognised by fingerprinting the stored files and bundles against known releases; a version is the release the bytes match.

Library	Version	Seen
@playpilot/tpi	8.40.0	2026-10-03
@marimo-team/frontend	0.25.0	2026-10-03
plausible		2026-10-03
@event-calendar/build	5.14.1	2026-10-03
@videojs/cdn	10.0.0-rc.3	2026-10-03
@liip/liipgpt	3.14.0	2026-10-03
p2p-media-loader-hlsjs	4.0.0	2026-09-25

Tracking, tag and verification IDs

Public identifiers read out of the source. Each links to every other site in the index that carries the same one.

What	Value	Found in
Plausible data-domain (Plausible)	janosh.dev	view source
Plausible data-domain (Plausible)	svelte-widgets.janosh.dev	view source

Third-party hosts

Hosts outside janosh.dev that its pages load scripts, frames or stylesheets from, and that its own scripts name in absolute URLs (connect). Each links to every site loading from the same host.

Host	Loaded as	Found in
akosiorek.github.io	connect	view source
arxiv.org	connect	view source
camphysoc.co.uk	connect	view source
danilorezende.com	connect	view source
deepmind.google	connect	view source
deno.land	connect	view source
developer.mozilla.org	connect	view source
docs.jax.dev	connect	view source
doi.org	connect	view source
git-scm.com	connect	view source
github.com	connect	view source
images.squarespace-cdn.com	connect	view source
ioppublishing.org	connect	view source
iopscience.iop.org	connect	view source
karpathy.ai	connect	view source
komoot.com	connect	view source
lilianweng.github.io	connect	view source
linkedin.com	connect	view source
matbench-discovery.materialsproject.org	connect	view source
materialsproject.org	connect	view source
mongodb.com	connect	view source
mrs.org	connect	view source
nodejs.org	connect	view source
papers.nips.cc	connect	view source
pbs.twimg.com	connect	view source
people.phy.cam.ac.uk	connect	view source
periodic.com	connect	view source
physik.uni-hamburg.de	connect	view source
physik.uni-heidelberg.de	connect	view source
plausible.io	script	view source
playwright.dev	connect	view source
pubs.rsc.org	connect	view source
python.org	connect	view source
pytorch.org	connect	view source
radical-ai.com	connect	view source
reactjs.org	connect	view source
rust-lang.org	connect	view source
scholar.google.com	connect	view source
slurm.schedmd.com	connect	view source
stackoverflow.com	connect	view source
svelte.dev	connect	view source
sveltekit-redirect.invalid	connect	view source
tailwindcss.com	connect	view source
typescriptlang.org	connect	view source
upload.wikimedia.org	connect	view source
vecteezy.com	connect	view source
vite.dev	connect	view source
wikipedia.org	connect	view source
www.advancedsciencenews.com	connect	view source
www.alpha-lee.com	connect	view source
www.ariseff.com	connect	view source
www.cam.ac.uk	connect	view source
www.nature.com	connect	view source
www.phy.cam.ac.uk	connect	view source
www.pymc.io	connect	view source
www.tcm.phy.cam.ac.uk	connect	view source
www.uni-heidelberg.de	connect	view source
www.w3.org	connect	view source
youtube.com	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 152) }. Versions are the crawls at which the file was new or its content changed; each opens the file as it was then, rebuilt from the same stored chunks.

File	Kind	Size	Collected	Versions
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https://janosh.dev/_app/immutable/chunks/D21MBoZv.js	js	2.6 KB	2026-09-25	current
https://janosh.dev/_app/immutable/chunks/DHQ52sUo.js	js	36.5 KB	2026-09-25	current
https://janosh.dev/_app/immutable/chunks/DaLJZW29.js	js	8 KB	2026-09-25	current
https://janosh.dev/_app/immutable/chunks/B1yHdDaK.js	js	16.4 KB	2026-09-25	current
https://janosh.dev/_app/immutable/chunks/Bl_HWB58.js	js	39 B	2026-09-25	current
https://janosh.dev/_app/immutable/chunks/DM5cNf7c.js	js	28.3 KB	2026-09-25	current
https://janosh.dev/_app/immutable/chunks/CIauS8Gq.js	js	294 B	2026-09-25	current
https://janosh.dev/_app/immutable/nodes/0.DJIaE_kZ.js	js	40.8 KB	2026-09-25	current
https://janosh.dev/_app/immutable/chunks/xihTtKlq.js	js library	65 B	2026-09-25	current
https://janosh.dev/_app/immutable/entry/app.QEn3vG0L.js	js	9.6 KB	2026-09-25	current
https://janosh.dev/_app/immutable/chunks/BrpgrJw4.js	js	586 B	2026-09-25	current
https://janosh.dev/_app/immutable/chunks/DbWRFpiB.js	js	64 KB	2026-09-25	current
https://janosh.dev/_app/immutable/chunks/DhiFbJmw.js	js	32.8 KB	2026-09-25	current
https://janosh.dev/_app/immutable/entry/start.DjXn10L4.js	js	82 B	2026-09-25	current

Timeline

One entry per crawl, newest first, with what changed since the crawl before: libraries, identifiers, third-party hosts and files. Historical versions stay viewable because the stored chunks are shared between versions, never copied.

2026-10-03 first crawl

5 pages, 88 files, 2.9 MB; 6 libraries, 2 identifiers, 59 third-party hosts
6 libraries added
- @marimo-team/frontend 0.25.0
- @event-calendar/build 5.14.1
- @playpilot/tpi 8.40.0
- @liip/liipgpt 3.14.0
- @videojs/cdn 10.0.0-rc.3
- plausible
2 identifiers added
- janosh.dev Plausible data-domain
- svelte-widgets.janosh.dev Plausible data-domain
59 third-party hosts added
- plausible.io
- svelte.dev
- www.w3.org
- github.com
- periodic.com
- scholar.google.com
- linkedin.com
- radical-ai.com
- materialsproject.org
- www.tcm.phy.cam.ac.uk
- doi.org
- upload.wikimedia.org
- and 47 more
88 files added

Questions about janosh.dev

How does PageSourceSearch know what janosh.dev is built with?: From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.
How far back does the history of janosh.dev go?: To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.
Can I see an older version of a script from janosh.dev?: Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.
Which other websites use the same tracking IDs as janosh.dev?: Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Look up another site, browse sites by tracking ID, third-party host or technology. Site owners: see the crawler page for how stored pages are removed.