jwt.io
JSON Web Tokens - jwt.io
Last scanned Jul 26, 2026, 5:17 AM · 1 view
Overall score
Excellent
Summary
JSON Web Token (JWT) is a compact URL-safe means of representing claims to be transferred between two parties. This website uses Next.js hosted on Cloudflare behind Cloudflare CDN. SEO is excellent (95/100) and accessibility is excellent (100/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Meta description longer than 160 characters.
JSON Web Token (JWT) is a compact URL-safe means of representing claims to be transferred between two parties. The claims in a JWT are encoded as a JSON object that is digitally signed using JSON Web Signature (JWS).
- United States
- Hosted on Cloudflare
Top issues to fix
4 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.
SEO
1 issue(s) found
Performance
340 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
JSON Web Token (JWT) is a compact URL-safe means of representing claims to be transferred between two parties. The claims in a JWT are encoded as a JSON object that is digitally signed using JSON Web Signature (JWS).
Meta tags
- Title
- JSON Web Tokens - jwt.io
- Description
- JSON Web Token (JWT) is a compact URL-safe means of representing claims to be transferred between two parties. The claims in a JWT are encoded as a JSON object that is digitally signed using JSON Web Signature (JWS).
- Canonical
- https://jwt.io
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
- https://www.jwt.io/manifest.webmanifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 104.18.32.191
- ASN
- AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Google Trust Services
- Subject
- jwt.io
- Valid from
- Jun 2, 2026
- Valid to
- Sep 1, 2026
- Days until expiry
- 36
- SAN domains
- jwt.io, *.jwt.io
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 1 · H2 0 · H3 2
Links
3 internal · 19 external · 0 broken
Images
1 total · 0 missing alt
Scripts / Styles
33 scripts · 6 stylesheets
JS / CSS size
38.8 KB · 2.8 KB
Page size
113 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 0
- sitemap.xml
- Found
- URLs in sitemap
- 3
SEO issues
- Meta description longer than 160 characters
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://jwt.io
- Final URL
- https://www.jwt.io/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 338 ms
- HTML size
- 113 KB
- Redirect chain
- https://jwt.io → https://www.jwt.io/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does jwt.io use?
- jwt.io is built with Next.js.
- Is jwt.io secure (HTTPS)?
- Yes. jwt.io uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Sep 1, 2026.
- Who hosts jwt.io?
- jwt.io is hosted on Cloudflare, behind Cloudflare CDN.
- What is jwt.io's SEO score?
- jwt.io scored 95/100 for SEO in the latest analysis (excellent).
- What is jwt.io's overall website score?
- jwt.io has an overall SiteGraph score of 92/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card