reactjs.org
React
Last scanned Jul 25, 2026, 8:25 AM · 2 views
Overall score
Great
Summary
React is the library for web and native user interfaces. This website uses Next.js hosted on AWS behind Vercel CDN. SEO is good (75/100) and accessibility is excellent (100/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Meta description longer than 160 characters.
React is the library for web and native user interfaces. Build user interfaces out of individual pieces called components written in JavaScript. React is designed to let you seamlessly combine components written by independent people, teams, and organizations.
- United States
- Hosted on AWS
Top issues to fix
7 issues found · 1 high priority
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Meta description longer than 160 characters
SEOTrim the meta description to under 160 characters to avoid truncation in search results.
Multiple H1 headings found
SEOKeep a single H1 per page and demote the others to H2/H3.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
+1 more issue — details in the sections below.
SEO
4 issue(s) found
Performance
52 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
React is the library for web and native user interfaces. Build user interfaces out of individual pieces called components written in JavaScript. React is designed to let you seamlessly combine components written by independent people, teams, and organizations.
Meta tags
- Title
- React
- Description
- React is the library for web and native user interfaces. Build user interfaces out of individual pieces called components written in JavaScript. React is designed to let you seamlessly combine components written by independent people, teams, and organizations.
- Canonical
- https://react.dev/
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
- https://react.dev/site.webmanifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA | — |
| MX | — |
| TXT |
|
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Let's Encrypt
- Subject
- react.dev
- Valid from
- Jun 15, 2026
- Valid to
- Sep 13, 2026
- Days until expiry
- 50
- SAN domains
- react.dev
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 2 · H2 15 · H3 32
Links
22 internal · 39 external · 0 broken
Images
43 total · 0 missing alt
Scripts / Styles
15 scripts · 1 stylesheets
JS / CSS size
839 KB · 106 KB
Page size
266 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Meta description longer than 160 characters
- Multiple H1 headings found
- No structured data (JSON-LD) found
- sitemap.xml not found
Accessibility issues
No accessibility issues detected.
Team
People listed on this site's own team or about page.
Andrew Clark
Engineer at Vercel
Jack Pope
Engineer at Meta
Mofei Zhang
Engineer at Meta
Moti Zilberman
Engineer at Meta
Nicola Corti
Engineer at Meta
Rick Hanlon
Engineer at Meta
Sebastian Silbermann
Engineer at Vercel
Alex Hunt
Engineer at Meta
Aurora Scharff
Engineer at Vercel
Brent Vatne
Engineer at Expo
Dan Abramov
Engineer at Vercel
Hendrik Liebau
Engineer at Vercel
Jordan Eldredge
Engineer at Meta
Josh Story
Engineer at Vercel
Kevin Gozali
Engineer at Meta
Khalef Hosany
Engineer at Microsoft
Krzysztof Magiera
Engineer at Software Mansion
Lauren Tan
Engineer at Cursor
Matt Carroll
Developer Advocate at Meta
Michael Leon
Engineer at Meta
Michał Pierzchała
Engineer at Callstack
Mike Vitousek
Engineer at Meta
Pieter De Baets
Engineer at Meta
Riccardo Cipolleschi
Engineer at Meta
Rob Hogan
Engineer at Meta
Rubén Norte
Engineer at Meta
Ruslan Lesiutin
Engineer at Meta
Sam Selikoff
Engineer at Vercel
Sophie Alpert
Independent Engineer
Steven Moyes
Engineer at Amazon
Scan details
- Requested URL
- https://reactjs.org
- Final URL
- https://react.dev/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 47 ms
- HTML size
- 266 KB
- Redirect chain
- https://reactjs.org → https://react.dev/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does reactjs.org use?
- reactjs.org is built with Next.js, Google Analytics.
- Is reactjs.org secure (HTTPS)?
- Yes. reactjs.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 13, 2026.
- Who hosts reactjs.org?
- reactjs.org is hosted on AWS, behind Vercel CDN.
- What is reactjs.org's SEO score?
- reactjs.org scored 75/100 for SEO in the latest analysis (fair).
- What is reactjs.org's overall website score?
- reactjs.org has an overall SiteGraph score of 86/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card