jsr.io
JSR: the JavaScript Registry
Last scanned Aug 2, 2026, 8:00 AM · 20 views
Overall score
Excellent
Summary
JSR is the open-source package registry for modern JavaScript. This website uses Cloudflare Analytics behind Cloudflare CDN. SEO is good (75/100) 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.
Top issues to fix
6 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.
robots.txt not found
SEOPublish /robots.txt with a Sitemap: directive to guide crawlers.
sitemap.xml not found
SEOPublish an XML sitemap and reference it from robots.txt to speed up page discovery.
20 broken links on the page
SEOFix or remove broken links — they waste crawl budget and erode user trust.
SEO
4 issue(s) found
Performance
378 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Score history
-3 overall since Jul 26, 2026
- Overall
- 90
- SEO
- 75
- Security
- 90
- Performance
- 100
- Accessibility
- 100
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
- —
- CDN provider
- Cloudflare
- IP address
- —
- ASN
- —
DNS records
| Type | Value |
|---|---|
| A | — |
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Google Trust Services
- Subject
- jsr.io
- Valid from
- Jul 27, 2026
- Valid to
- Oct 25, 2026
- Days until expiry
- 83
- 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 · 20 broken
Images
8 total · 0 missing alt
Scripts / Styles
5 scripts · 1 stylesheets
JS / CSS size
2.0 KB · 1.3 KB
Page size
43.5 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Missing canonical link
- No structured data (JSON-LD) found
- robots.txt not found
- sitemap.xml not 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
- 378 ms
- HTML size
- 43.5 KB
- Redirect chain
- https://jsr.io
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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 Oct 25, 2026.
- Who hosts jsr.io?
- Hosting provider information for jsr.io is not available yet.
- What is jsr.io's SEO score?
- jsr.io scored 75/100 for SEO in the latest analysis (fair).
- What is jsr.io's overall website score?
- jsr.io has an overall SiteGraph score of 90/100, combining SEO, performance, security, and accessibility.
- Has jsr.io's score changed over time?
- jsr.io's overall score has declined by 3 points (from 93 to 90) since Jul 26, 2026.
OpenGraph & Twitter Card
OpenGraph
Twitter Card