superjson on new websites
JavaScript library that serialises values JSON cannot hold, such as Dates, Maps, Sets and BigInts.
- Sites using superjson
- 111
- since Jul 2026
- Last 30 days
- 0.0%
-
of new sites, to Nov 5
no change on the 30 days before - Last 7 days
- 0.0%
- of new sites, 7-day average
no change on the week before
| First seen | Jul 29, 2026 |
|---|---|
| Last seen | Nov 6, 2026 |
| Website | github.com |
What we found
- superjson appeared on about 67 new sites in the last 30 days.[1]
- Almost all new superjson sites also use React.
Share of new sites using superjson
The line is the 7-day average share of new sites that use superjson, since 16 September. It starts at our first detection.
Who uses superjson
| Type | Sites | Share | Bar |
|---|---|---|---|
| Health | 6 | 17.7% | |
| Finance | 5 | 14.7% | |
| E-commerce | 4 | 11.8% | |
| Education | 4 | 11.8% | |
| Social | 4 | 11.8% | |
| AI | 2 | 5.9% | |
| Design | 2 | 5.9% | |
| Productivity | 2 | 5.9% | |
| Content | 1 | 2.9% | |
| Developer Tools | 1 | 2.9% | |
| Games | 1 | 2.9% | |
| Hiring & HR | 1 | 2.9% |
| Country | Sites | Share | Bar |
|---|---|---|---|
 Brazil |
2 | 16.7% | |
 Canada |
2 | 16.7% | |
 Australia |
1 | 8.3% | |
 Germany |
1 | 8.3% | |
 France |
1 | 8.3% | |
 Indonesia |
1 | 8.3% | |
 India |
1 | 8.3% | |
 Netherlands |
1 | 8.3% | |
 Poland |
1 | 8.3% | |
 US |
1 | 8.3% |
| Ending | Sites | Share | Bar |
|---|---|---|---|
| .com | 76 | 68.5% | |
| .live | 5 | 4.5% | |
| .org | 4 | 3.6% | |
| .online | 3 | 2.7% | |
| .pro | 3 | 2.7% | |
| .app | 2 | 1.8% | |
| .br | 2 | 1.8% | |
| .ca | 2 | 1.8% | |
| .space | 2 | 1.8% | |
| .ai | 1 | 0.9% | |
| .au | 1 | 0.9% | |
| .ch | 1 | 0.9% |
Javascript Library on new sites
| # | Movement | Tool | Share of category[3] | Bar | |
|---|---|---|---|---|---|
| 1 | – |
jQuery
|
34.3% | ||
| 2 | – | jQuery Migrate | 18.8% | ||
| 3 | – |
React Router
|
16.1% | ||
| 4 | ▼1 |
Motion
|
14.1% | ||
| 5 | ▲1 |
TanStack Router
|
11.0% | ||
| 6 | ▼1 |
Swiper
|
8.1% | ||
| 7 | ▲1 |
ES Module Shims
|
7.1% | ||
| 8 | – |
js-cookie
|
6.1% | ||
| 9 | ▼1 |
Modernizr
|
5.8% | ||
| 10 | ▲1 |
GSAP
|
4.7% | ||
| 11 | ▲1 |
Lenis
|
3.4% | ||
| 12 | ▲3 |
Three.js
|
3.2% | ||
| … | |||||
| 450 |
superjson
|
<0.1% | |||
All-time shares across the new sites we track: of all of them, and of the sites using any Javascript Library tool. All 1713 in Javascript Library
Often used with superjson
| Tool | Sites with both | vs all new sites |
|---|---|---|
tRPC
|
64 | 47294x |
Wouter
|
49 | 177x |
Manus
|
44 | 142x |
Umami
|
44 | 52x |
Google Cloud
|
37 | 39x |
Tools that turn up far more often on superjson sites than on new sites in general, and how many times as common each one is there.
Recently launched products built on superjson
27 of the 111 sites using superjson are product launches we list individually. The other 84 are new business and personal sites: they count towards the figures above but are not listed here. A watch sends them to you.
United Kingdom
Spain
Switzerland
Showing the most recent 12 of 27.
Watches, exports and the API give you all 111 sites using superjson, from £15 a month.
Notes
- These figures cover websites that went live since April 2026, not the web as a whole.
- Country comes from what each site says about itself, such as a company registration, legal terms or a phone number, not just its domain ending. We count a country only where it is stated plainly enough to be sure: a governing-law clause or company registration number on a legal page, a phone country code, or a country domain ending. Sites that publish none are not counted at all.
- Some products people expect to see here are filed under a related category: UI Library.
How this page is made
FirstSited looks at each new website near the day it goes live and records what it was built with. We do not go back later, so these figures describe what sites launch with, not what they run today. A site counts towards superjson when we detect superjson on it at that look.
Every share on this page is a proportion of the new sites we were tracking at the time. Sites we found across the wider web count towards the figures, but only product launches are listed by name. How we detect technologies · How we find new sites