jsr.io
JSR: the JavaScript Registry
Last scanned Jul 26, 2026, 5:17 AM · 2 views
Overall score
Excellent
Summary
JSR is the open-source package registry for modern JavaScript. This website uses Cloudflare Analytics hosted on Cloudflare behind Cloudflare CDN. SEO is good (85/100) and accessibility is excellent (100/100). Security scores excellent (90/100) and performance excellent (100/100). Top issue: Missing canonical link.
JSR is the open-source package registry for modern JavaScript. JSR natively supports TypeScript, and works with all JS runtimes and package managers.
- United States
- Hosted on Cloudflare
Top issues to fix
3 issues found · 1 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
SEO
2 issue(s) found
Performance
386 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
JSR is the open-source package registry for modern JavaScript. JSR natively supports TypeScript, and works with all JS runtimes and package managers.
Meta tags
- Title
- JSR: the JavaScript Registry
- Description
- JSR is the open-source package registry for modern JavaScript. JSR natively supports TypeScript, and works with all JS runtimes and package managers.
- Canonical
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1.0
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 172.67.135.174
- ASN
- AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX |
|
| TXT |
|
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Google Trust Services
- Subject
- jsr.io
- Valid from
- May 29, 2026
- Valid to
- Aug 27, 2026
- Days until expiry
- 31
- SAN domains
- jsr.io, *.jsr.io
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyEnabled
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 1 cookie(s) observed
Content & assets
Headings
H1 1 · H2 3 · H3 6
Links
35 internal · 5 external · 0 broken
Images
8 total · 0 missing alt
Scripts / Styles
5 scripts · 1 stylesheets
JS / CSS size
32.8 KB · 1.3 KB
Page size
43.5 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 9
- sitemap.xml
- Found
- URLs in sitemap
- -1
SEO issues
- Missing canonical link
- No structured data (JSON-LD) found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://jsr.io
- Final URL
- https://jsr.io
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 386 ms
- HTML size
- 43.5 KB
- Redirect chain
- https://jsr.io
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does jsr.io use?
- jsr.io is built with Cloudflare Analytics.
- Is jsr.io secure (HTTPS)?
- Yes. jsr.io uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Aug 27, 2026.
- Who hosts jsr.io?
- jsr.io is hosted on Cloudflare, behind Cloudflare CDN.
- What is jsr.io's SEO score?
- jsr.io scored 85/100 for SEO in the latest analysis (great).
- What is jsr.io's overall website score?
- jsr.io has an overall SiteGraph score of 93/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card