react.dev

React

Last scanned Jul 24, 2026, 10:25 PM · 1 view

86

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
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.

+1 more issue — details in the sections below.

75

SEO

4 issue(s) found

100

Performance

22 ms

75

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.

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.

YouTube X (Twitter)Facebook X (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

Technologies

Detected frameworks, languages, and tools.

Next.js Google Analytics

Hosting & CDN

Hosting provider: AWS
CDN provider: Vercel
IP address: 66.33.60.35
ASN: AS16509 (AMAZON-02 - Amazon.com, Inc., US)

DNS records

Type	Value
A	66.33.60.35 76.76.21.123
AAAA	—
MX	—
TXT	google-site-verification=a5RC7LuUuYSWBrPBwybnA2bPZSh4aYEDbYEg7O4t9l4
NS	junade.ns.cloudflare.com hattie.ns.cloudflare.com
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

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://react.dev
Final URL: https://react.dev
HTTP status: 200
HTTP version: HTTP/2
Response time: 17 ms
HTML size: 266 KB
Redirect chain: https://react.dev

See something wrong on this report? Request a correction

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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?: react.dev is hosted on AWS, behind Vercel CDN.
What is react.dev's SEO score?: react.dev scored 75/100 for SEO in the latest analysis (fair).
What is react.dev's overall website score?: react.dev has an overall SiteGraph score of 86/100, combining SEO, performance, security, and accessibility.