Skip to main content
SGSiteGraph

react.dev

React

Last scanned Jul 31, 2026, 11:00 PM · 9 views

85

Overall score

Great

Summary

React is the library for web and native user interfaces. This website uses Next.js behind Vercel CDN. SEO is fair (70/100) 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.

Top issues to fix

9 issues found · 1 high priority

  • Missing Content-Security-Policy header

    Security

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

  • Missing X-Content-Type-Options header

    Security

    Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.

  • Missing X-Frame-Options header

    Security

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

  • Meta description longer than 160 characters

    SEO

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

  • Multiple H1 headings found

    SEO

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

  • No structured data (JSON-LD) found

    SEO

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

+3 more issues — details in the sections below.

70

SEO

5 issue(s) found

100

Performance

24 ms

75

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Score history

-1 overall since Jul 24, 2026

Overall
85
SEO
70
Security
75
Performance
100
Accessibility
100

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.

YouTubeX (Twitter)FacebookX (Twitter)

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

OpenGraph & Twitter Card

OpenGraph

og:title
React
og: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.
og:type
website
og:url
https://react.dev/

Twitter Card

twitter:card
summary_large_image
twitter:title
React
twitter: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.

Technologies

Detected frameworks, languages, and tools.

Next.jsGoogle Analytics

Hosting & CDN

Hosting provider
—
CDN provider
Vercel
IP address
—
ASN
—

DNS records

TypeValue
A—
AAAA—
MX—
TXT—
NS—
CAA—
CNAME—
IPv6 supportNo

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
43
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 · 20 broken

Images

43 total · 0 missing alt

Scripts / Styles

15 scripts · 1 stylesheets

JS / CSS size

4.3 KB · 0 B

Page size

266 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
  • Multiple H1 headings found
  • No structured data (JSON-LD) found
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://react.dev
Final URL
https://react.dev
HTTP status
200
HTTP version
HTTP/2
Response time
19 ms
HTML size
266 KB
Redirect chain
https://react.dev

See something wrong on this report? Request a correction

Related websites

Same technology stack

discord.dev

Discord Developer Platform - Documentation - Discord

100
nextjsgoogle-analyticscloudflare-analytics
Cloudflare· Cloudflare

emplifyhealth.org

Emplify Health | A Little Empathy Changes Everything

100
nextjsgoogle-analyticsvue
Cloudflare· Cloudflare

cutshort.io

Cutshort: Making Top Professionals More Successful.

100
nextjsgoogle-analyticscloudflare-analytics
Cloudflare· Cloudflare

cyware.com

Cyware - AI-Powered Threat Intelligence Platform | Home

100
nextjsgoogle-analytics
AWS· Vercel

ashbyprd.com

All-in-one Recruiting Software for Ambitious Teams | Ashby

100
nextjsgoogle-analytics
AWS· Netlify

fhinck.com

Fhinck — Task Mining + Agentes de IA | AI First

100
nextjsgoogle-analytics
Fastly

Frequently asked questions

What technology does react.dev use?
react.dev is built with Next.js, Google Analytics.
Is react.dev secure (HTTPS)?
Yes. react.dev uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 13, 2026.
Who hosts react.dev?
Hosting provider information for react.dev is not available yet.
What is react.dev's SEO score?
react.dev scored 70/100 for SEO in the latest analysis (fair).
What is react.dev's overall website score?
react.dev has an overall SiteGraph score of 85/100, combining SEO, performance, security, and accessibility.
Has react.dev's score changed over time?
react.dev's overall score has declined by 1 point (from 86 to 85) since Jul 24, 2026.