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highlightjs.org

highlight.js

Last scanned Jul 26, 2026, 12:19 PM

74

Overall score

Fair

Summary

The Internet's favorite JavaScript syntax highlighter supporting Node.js and the web. This website uses Next.js hosted on AWS behind Netlify CDN. SEO is fair (65/100) and accessibility is good (80/100). Security scores good (80/100) and performance good (75/100). Top issue: Missing canonical link.

The Internet's favorite JavaScript syntax highlighter supporting Node.js and the web.

United States
Hosted on AWS

Top issues to fix

9 issues found · 2 high priority

  • Missing Content-Security-Policy header

    Security

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

  • No H1 heading found

    SEO

    Add exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.

  • Missing X-Frame-Options header

    Security

    Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.

  • Missing canonical link

    SEO

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

  • No structured data (JSON-LD) found

    SEO

    Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.

  • robots.txt not found

    SEO

    Publish /robots.txt with a Sitemap: directive to guide crawlers.

+3 more issues — details in the sections below.

65

SEO

5 issue(s) found

75

Performance

340 ms

80

Security

HTTPS & header checks

80

Accessibility

2 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.

The Internet's favorite JavaScript syntax highlighter supporting Node.js and the web.

Contact

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

Meta tags

Title
highlight.js
Description
The Internet's favorite JavaScript syntax highlighter supporting Node.js and the web.
Canonical
Language
Charset
utf-8
Viewport
width=device-width
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
highlight.js
og:description
—
og:type
website
og:url
https://highlightjs.org/

Twitter Card

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

Technologies

Detected frameworks, languages, and tools.

Next.js

Hosting & CDN

Hosting provider
AWS
CDN provider
Netlify
IP address
75.2.60.5
ASN
AS16509 (AMAZON-02 - Amazon.com, Inc., US)

DNS records

TypeValue
A
  • 75.2.60.5
AAAA—
MX
  • mx.hover.com.cust.hostedemail.com
TXT—
NS
  • ns1.hover.com
  • ns2.hover.com
CAA—
CNAME—
IPv6 supportNo

TLS / SSL certificate

Version
TLS 1.3
Issuer
Let's Encrypt
Subject
highlightjs.org
Valid from
Jul 25, 2026
Valid to
Oct 23, 2026
Days until expiry
86
SAN domains
highlightjs.org, www.highlightjs.org

Security headers

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

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 0 · H2 2 · H3 2

Links

6 internal · 9 external · 1 broken

Images

3 total · 0 missing alt

Scripts / Styles

14 scripts · 2 stylesheets

JS / CSS size

1.5 MB · 1.3 MB

Page size

27.2 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 H1 heading found
  • No structured data (JSON-LD) found
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

  • No H1 heading found
  • Missing <html lang> attribute

Scan details

Requested URL
https://highlightjs.org
Final URL
https://highlightjs.org
HTTP status
200
HTTP version
HTTP/2
Response time
340 ms
HTML size
27.2 KB
Redirect chain
https://highlightjs.org

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does highlightjs.org use?
highlightjs.org is built with Next.js.
Is highlightjs.org secure (HTTPS)?
Yes. highlightjs.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 23, 2026.
Who hosts highlightjs.org?
highlightjs.org is hosted on AWS, behind Netlify CDN.
What is highlightjs.org's SEO score?
highlightjs.org scored 65/100 for SEO in the latest analysis (fair).
What is highlightjs.org's overall website score?
highlightjs.org has an overall SiteGraph score of 74/100, combining SEO, performance, security, and accessibility.