.js
5 claimants
2 primary
0 secondary
shared primary (2)
SWH popularity
From the SWH-MSR-ARV dataset (Desmazières, Di Cosmo, Lorentz, MSR 2025; file nb_extensions_alphanum.csv) — one row per (ext, year) in the full SWH archive. Case-aggregated. citation.
946.0M
total occurrences
338.4M
since 2019 (35.8%)
1970–2023
years active
Case variants in archive: .js (945.9M), .JS (40.0K), .Js (5.1K), .jS (90) — aggregated above.
Attribution status
This extension is attributed to JavaScript; JavaScript; JavaScript; JSFuck as primary by 4 authoritative claims.
Claimants (7)
Languages that list
.js among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| JavaScript | linguist | primary |
| JavaScript | pygments | primary |
| JavaScript | wikidata | primary |
| JSFuck | wikidata | primary |
| JScript | wikipedia | proposed |
| JSFX | wikipedia | proposed |
| Source | wikipedia | proposed |
Wikidata says… (3)
File formats, image formats, audio codecs and other non-PL
entities that claim
.js on Wikidata
(property P1195) or in the Wikipedia infobox.
Source: data/derived/external_extension_index.csv.
Click Use as new PL on any row to open the
Add-PL form pre-filled with that entry's name, Wikipedia/Wikidata
URL, and this extension — one submission creates the PL + claim.
| Format | Class (Wikidata P31) | Suggested label | MIME | Notes | Action |
|---|---|---|---|---|---|
| ExtendScript Q16976350 scripting language (an extension of JavaScript) and associated toolkit, developed by Adobe | programming language | — | — | — | Use as new PL ↗ |
| JavaScript Style Sheets Q1633849 Stylesheet language proposed by Netscape | style sheet language | — | text/javascript | — | Use as new PL ↗ |
| JavaScript format Q5924007 file format that contains scripts in JavaScript | file format | — | text/javascript | — | Use as new PL ↗ |
SWH-mined examples (0)
No archived examples for .js in our local mirror yet.