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SGSiteGraph

ndl.go.jp

国立国会図書館

Last scanned Jul 25, 2026, 6:25 AM · 2 views

83

Overall score

Great

Summary

国立国会図書館の公式ウェブサイトです。当館は、国内外の資料・情報を広く収集・保存して、知識・文化の基盤となり、国会の活動を補佐するとともに、行政・�… This website uses Nuxt hosted on AWS behind CloudFront CDN. SEO is good (85/100) and accessibility is excellent (100/100). Security scores excellent (100/100) and performance fair (50/100). Top issue: Meta description longer than 160 characters.

国立国会図書館の公式ウェブサイトです。当館は、国内外の資料・情報を広く収集・保存して、知識・文化の基盤となり、国会の活動を補佐するとともに、行政・司法及び国民に図書館サービスを提供しています。

United States
Hosted on AWS

Top issues to fix

3 issues found

  • Meta description longer than 160 characters

    SEO

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

  • Missing canonical link

    SEO

    Add <link rel="canonical"> so search engines know which URL variant to index.

  • Multiple H1 headings found

    SEO

    Keep a single H1 per page and demote the others to H2/H3.

85

SEO

3 issue(s) found

50

Performance

1.62 s

100

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.

国立国会図書館の公式ウェブサイトです。当館は、国内外の資料・情報を広く収集・保存して、知識・文化の基盤となり、国会の活動を補佐するとともに、行政・司法及び国民に図書館サービスを提供しています。

X (Twitter)YouTube

Contact

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

Meta tags

Title
国立国会図書館
Description
国立国会図書館の公式ウェブサイトです。当館は、国内外の資料・情報を広く収集・保存して、知識・文化の基盤となり、国会の活動を補佐するとともに、行政・司法及び国民に図書館サービスを提供しています。
Canonical
Language
ja
Charset
utf-8
Viewport
width=device-width, initial-scale=1, viewport-fit=cover
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
国立国会図書館
og:description
国立国会図書館の公式ウェブサイトです。当館は、国内外の資料・情報を広く収集・保存して、知識・文化の基盤となり、国会の活動を補佐するとともに、行政・司法及び国民に図書館サービスを提供しています。
og:type
article
og:url
https://www.ndl.go.jp/

Twitter Card

twitter:card
—
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

Vue.jsNuxtGoogle Analytics

Hosting & CDN

Hosting provider
AWS
CDN provider
CloudFront
IP address
108.159.80.121
ASN
AS16509 (AMAZON-02 - Amazon.com, Inc., US)

DNS records

TypeValue
A
  • 108.159.80.121
  • 108.159.80.115
  • 108.159.80.104
  • 108.159.80.101
AAAA—
MX—
TXT—
NS
  • ns-1909.awsdns-46.co.uk
  • ns-581.awsdns-08.net
  • ns-1031.awsdns-00.org
  • ns-342.awsdns-42.com
CAA—
CNAME—
IPv6 supportNo

TLS / SSL certificate

Version
TLS 1.3
Issuer
Amazon
Subject
www.ndl.go.jp
Valid from
Dec 12, 2025
Valid to
Jan 10, 2027
Days until expiry
169
SAN domains
www.ndl.go.jp, hp.ndlsearch.ndl.go.jp

Security headers

  • Strict-Transport-SecurityEnabled
  • Content-Security-PolicyEnabled
  • X-Frame-OptionsEnabled
  • X-Content-Type-OptionsEnabled
  • Referrer-PolicyEnabled
  • Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 2 · H2 4 · H3 0

Links

26 internal · 10 external · 0 broken

Images

9 total · 0 missing alt

Scripts / Styles

3 scripts · 2 stylesheets

JS / CSS size

3.2 MB · 322 KB

Page size

212 KB

Robots.txt & Sitemap

robots.txt
Found
Disallow rules
0
sitemap.xml
Found
URLs in sitemap
-1

SEO issues

  • Meta description longer than 160 characters
  • Missing canonical link
  • Multiple H1 headings found

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://ndl.go.jp
Final URL
https://www.ndl.go.jp:443/
HTTP status
200
HTTP version
HTTP/2
Response time
1.61 s
HTML size
212 KB
Redirect chain
https://ndl.go.jp → https://www.ndl.go.jp:443/

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Frequently asked questions

What technology does ndl.go.jp use?
ndl.go.jp is built with Vue.js, Nuxt, Google Analytics.
Is ndl.go.jp secure (HTTPS)?
Yes. ndl.go.jp uses TLS 1.3 with a certificate issued by Amazon, valid until Jan 10, 2027.
Who hosts ndl.go.jp?
ndl.go.jp is hosted on AWS, behind CloudFront CDN.
What is ndl.go.jp's SEO score?
ndl.go.jp scored 85/100 for SEO in the latest analysis (great).
What is ndl.go.jp's overall website score?
ndl.go.jp has an overall SiteGraph score of 83/100, combining SEO, performance, security, and accessibility.