Legacy.reactjs.org - SEO Checker

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Overview of the SEO Check
Meta information
79% 
Page quality
66% 
Page structure
40% 
Link structure
96% 
Server
100% 
External factors
100% 
SEO Score
Response time
0.04 s
File size
83.70 kB
Words
388
Media files
2
Number of links
23 internal / 18 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
React – A JavaScript library for building user interfaces
The length of the page title is perfect. (489 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
The meta description is missing.
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
https://legacy.reactjs.org/
There is a valid canonical link specified.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en
Server location: United States of America
The following language is defined by HTML: en
Alternate/Hreflang Links
(Somewhat important)
The specified alternate links have no errors.
Other meta tags
(Somewhat important)
There is no rel next meta tag on this page.
There is no rel prev meta tag on this page.
Domain
(Somewhat important)
This page is hosted on a subdomain. Use a top level domain for better SEO results.
The domain does not contain non-latin characters.
Page URL
(Somewhat important)
No parameters were found in the URL.
No session ID was found in the URL.
The URL does not have too many subdirectories.
Charset encoding
(Somewhat important)
The charset encoding (UTF-8) is set correctly.
Doctype
(Nice to have)
The doctype HTML 5 is set correctly.
The doctype is placed at first in the HTML code.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

NameValue
viewportwidth=device-width, initial-scale=1.0
apple-mobile-web-app-capableyes
apple-mobile-web-app-titleReact
generatorGatsby 2.32.13
theme-color#20232a
langen
fb:app_id623268441017527
og:titleReact – A JavaScript library for building user interfaces
og:typewebsite
og:urlhttps://legacy.reactjs.org/
og:imagehttps://legacy.reactjs.org/logo-og.png
og:descriptionA JavaScript library for building user interfaces
X-UA-CompatibleIE=edge
charsetutf-8

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Page quality

Content
(Critically important)
There are only 388 words on this page. Good pages should have about 800 words of useful content.
35.3% of the text are stop words.
Keywords used in the page title are also used in the page content. That's good!
8 paragraphs were found on this page.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 15.24 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
A viewport "width=device-width, initial-scale=1.0" is provided.
At least one Apple touch icon is specified.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 8 tags for this page.
Image SEO
(Somewhat important)
1 images have no alt attribute. The content of alt attributes is used by search engines.
Social Networks
(Nice to have)
There are only a few social sharing widgets on the page. Make your website popular in social networks with social sharing widgets.
Additional markup
(Nice to have)
No additional page markup was found.
HTTPS
(Somewhat important)
This website uses HTTPS to protect privacy and integrity of the exchanged data.
All included files are also transferred via HTTPS.

Media list

URLAlt attributeTitle
data:[...] Base64No alt attribute provided
data:[...] Base64Facebook Open Source

Page structure

H1 heading
(Critically important)
React
The H1 heading consists of only one word. There should be more information given.
The H1 heading is too short (5 characters). It should be at least 20 Characters long.
Headings
(Important)
Some headings occur twice on the page.
The structure of headings is missing one or more levels. Do not skip heading levels.

Heading structure

Heading levelContent
H1 React
H3 Declarative
H3 Component-Based
H3 Learn Once, Write Anywhere
H3 A Simple Component
H3 A Stateful Component
H3 An Application
H3 A Component Using External Plugins
H4 Loading code example...
H4 Loading code example... Duplicate text
H4 Loading code example... Duplicate text
H4 Loading code example... Duplicate text
Some anchor texts are used more than once.
The number of internal links is ok.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are 18 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://surveys.savanta.com/su...New window External Subdomain No Text
https://surveys.savanta.com/su...New window External Subdomain Take our 2021 Community Survey!
https://react.dev/blog/2023/03...New window External Go to react.dev
https://legacy.reactjs.org/React
/docs/getting-started.htmlDocs
/tutorial/tutorial.htmlTutorial
https://legacy.reactjs.org/blog/Blog
/community/support.htmlCommunity
/versionsv18.2.0
/languagesLanguages
https://github.com/facebook/re...New window External GitHub
/docs/getting-started.htmlGet Started
/tutorial/tutorial.htmlTake the Tutorial
https://reactnative.dev/New window Nofollow External React Native
https://babeljs.io/repl/?New window External Anchor Babel REPL
/docs/getting-started.htmlText duplicate Get Started
/tutorial/tutorial.htmlText duplicate Take the Tutorial
/docs/getting-started.htmlInstallation
/docs/hello-world.htmlMain Concepts
/docs/accessibility.htmlAdvanced Guides
/docs/react-api.htmlAPI Reference
/docs/hooks-intro.htmlHooks
/docs/testing.htmlTesting
/docs/how-to-contribute.htmlContributing
/docs/faq-ajax.htmlFAQ
https://github.com/facebook/reactNew window External Text duplicate GitHub
https://stackoverflow.com/ques...New window External Stack Overflow
https://reactjs.org/community/...New window External Anchor Discussion Forums
https://discord.gg/reactifluxNew window External Reactiflux Chat
https://dev.to/t/reactNew window External DEV Community
https://www.facebook.com/reactNew window External Subdomain Facebook
https://twitter.com/reactjsNew window External Twitter
https://github.com/facebook/re...External Code of Conduct
/community/support.htmlCommunity Resources
/tutorial/tutorial.htmlText duplicate Tutorial
https://legacy.reactjs.org/blogText duplicate Blog
/acknowledgements.htmlAcknowledgements
https://reactnative.dev/New window External Text duplicate React Native
https://opensource.facebook.co...External Subdomain Privacy
https://opensource.facebook.co...External Subdomain Terms
https://opensource.facebook.co...New window External Subdomain IMG-ALT Facebook Open Source

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://legacy.reactjs.org/"
HTTP header
(Important)
No X-Powered HTTP header is sent.
The web server transmits the web page (HTML) in compressed form.
Performance
(Somewhat important)
The page response time is excellent with 0.04 seconds.
The file size of the HTML document is fine (84 kB).

HTTP Response Header

NameValue
accept-rangesbytes
access-control-allow-origin*
age777963
cache-controlpublic, max-age=0, must-revalidate
content-dispositioninline
content-encodingbr
content-typetext/html; charset=utf-8
dateMon, 23 Jun 2025 00:50:37 GMT
etag"40841f1143f04b2706e83ea4fd1d3740"
last-modifiedSat, 14 Jun 2025 00:44:33 GMT
serverVercel
strict-transport-securitymax-age=63072000
x-vercel-cacheHIT
x-vercel-idfra1::5cngk-1750639837555-e6eb888f1869
content-length23835
statuscode200
http_versionHTTP/2

External factors

This website has excellent links from other websites.
This page has backlinks from 1,870 referring domains.
This page has 634,883 backlinks.
This page has backlinks from 1,342 different ip addresses.

Links from Wikipedia

No links from Wikipedia were found.

Robots.txt

User-agent: *
Disallow: /version/

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Search preview

Most important keywords

Following keywords were found. You can check the keyword optimization of this page for each keyword.

KeywordResultRecheck
react78%Check
React Native56%Check
JavaScript46%Check
library46%Check
user interfaces46%Check
JavaScript library46%Check
building user interfaces46%Check
user45%Check
building45%Check
component43%Check
Show more keywords and terms

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