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javascript.info

The Modern JavaScript Tutorial

Last scanned Jul 26, 2026, 5:47 AM · 4 views

92

Overall score

Excellent

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 hosted on Cloudflare behind Cloudflare CDN. SEO is excellent (90/100) and accessibility is excellent (100/100). Security scores good (80/100) and performance excellent (100/100). 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.

United States
Hosted on Cloudflare

Top issues to fix

4 issues found · 2 high priority

  • Missing Strict-Transport-Security header

    Security

    Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.

  • Missing Content-Security-Policy header

    Security

    Add a CSP to control which sources can run scripts — the strongest single defense against XSS.

  • Meta description longer than 160 characters

    SEO

    Trim the meta description to under 160 characters to avoid truncation in search results.

  • sitemap.xml not found

    SEO

    Publish an XML sitemap and reference it from robots.txt to speed up page discovery.

90

SEO

2 issue(s) found

100

Performance

536 ms

80

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

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.

X (Twitter)Facebook

Contact

Email, phone, and address published on this site's own pages.

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

OpenGraph & Twitter Card

OpenGraph

og:title
The Modern JavaScript Tutorial
og:description
—
og:type
—
og:url
—

Twitter Card

twitter:card
summary
twitter:title
The Modern JavaScript Tutorial
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

Google AnalyticsCloudflare Analytics

Hosting & CDN

Hosting provider
Cloudflare
CDN provider
Cloudflare
IP address
104.26.12.17
ASN
AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)

DNS records

TypeValue
A
  • 104.26.12.17
  • 104.26.13.17
  • 172.67.74.41
AAAA
  • 2606:4700:20::681a:d11
  • 2606:4700:20::681a:c11
  • 2606:4700:20::ac43:4a29
MX
  • aspmx.l.google.com
  • aspmx5.googlemail.com
  • aspmx4.googlemail.com
  • alt1.aspmx.l.google.com
  • aspmx3.googlemail.com
  • alt2.aspmx.l.google.com
  • aspmx2.googlemail.com
TXT
  • google-site-verification=OPB5BvCtqM2C2mOORtOj07XW_sgzSq2aW7r63B5s6yY
  • yandex-verification: 9ecaa357f86ab13e
  • v=spf1 include:amazonses.com include:_spf.google.com include:mail.zendesk.com ~all
NS
  • damon.ns.cloudflare.com
  • ines.ns.cloudflare.com
CAA—
CNAME—
IPv6 supportYes

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
53
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

26 scripts · 3 stylesheets

JS / CSS size

589 KB · 250 KB

Page size

52.5 KB

Robots.txt & Sitemap

robots.txt
Found
Disallow rules
5
sitemap.xml
Not found
URLs in sitemap
0

SEO issues

  • Meta description longer than 160 characters
  • 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
535 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?
javascript.info is hosted on Cloudflare, behind Cloudflare CDN.
What is javascript.info's SEO score?
javascript.info scored 90/100 for SEO in the latest analysis (excellent).
What is javascript.info's overall website score?
javascript.info has an overall SiteGraph score of 92/100, combining SEO, performance, security, and accessibility.