javascript.info
The Modern JavaScript Tutorial
Last scanned Aug 5, 2026, 4:00 PM · 9 views
Overall score
Great
Summary
Modern JavaScript Tutorial: simple, but detailed explanations with examples and tasks, including: closures, document and events, object oriented programming and more. This website uses Google Analytics behind Cloudflare CDN. SEO is good (85/100) and accessibility is excellent (100/100). Security scores good (80/100) and performance good (85/100). Top issue: Meta description longer than 160 characters.
Modern JavaScript Tutorial: simple, but detailed explanations with examples and tasks, including: closures, document and events, object oriented programming and more.
Top issues to fix
5 issues found · 2 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Meta description longer than 160 characters
SEOTrim the meta description to under 160 characters to avoid truncation in search 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.
SEO
3 issue(s) found
Performance
564 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Score history
-5 overall since Jul 26, 2026
- Overall
- 87
- SEO
- 85
- Security
- 80
- Performance
- 85
- Accessibility
- 100
Organization
Company details published in this site's own structured data.
Modern JavaScript Tutorial: simple, but detailed explanations with examples and tasks, including: closures, document and events, object oriented programming and more.
Contact
Email, phone, and address published on this site's own pages.
- your@email.here
Meta tags
- Title
- The Modern JavaScript Tutorial
- Description
- Modern JavaScript Tutorial: simple, but detailed explanations with examples and tasks, including: closures, document and events, object oriented programming and more.
- Canonical
- https://javascript.info/
- Language
- en
- Charset
- Viewport
- width=device-width, initial-scale=1, user-scalable=yes, minimum-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 1.2
- Issuer
- Google Trust Services
- Subject
- javascript.info
- Valid from
- Jun 21, 2026
- Valid to
- Sep 19, 2026
- Days until expiry
- 45
- SAN domains
- javascript.info, *.javascript.info
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 5 · H3 1
Links
210 internal · 22 external · 0 broken
Images
4 total · 0 missing alt
Scripts / Styles
31 scripts · 3 stylesheets
JS / CSS size
1.1 MB · 0 B
Page size
52.5 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Meta description longer than 160 characters
- robots.txt not found
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://javascript.info
- Final URL
- https://javascript.info
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 563 ms
- HTML size
- 52.5 KB
- Redirect chain
- https://javascript.info
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Frequently asked questions
- What technology does javascript.info use?
- javascript.info is built with Google Analytics, Cloudflare Analytics.
- Is javascript.info secure (HTTPS)?
- Yes. javascript.info uses TLS 1.2 with a certificate issued by Google Trust Services, valid until Sep 19, 2026.
- Who hosts javascript.info?
- Hosting provider information for javascript.info is not available yet.
- What is javascript.info's SEO score?
- javascript.info scored 85/100 for SEO in the latest analysis (great).
- What is javascript.info's overall website score?
- javascript.info has an overall SiteGraph score of 87/100, combining SEO, performance, security, and accessibility.
- Has javascript.info's score changed over time?
- javascript.info's overall score has declined by 5 points (from 92 to 87) since Jul 26, 2026.
OpenGraph & Twitter Card
OpenGraph
Twitter Card