bun.sh
Bun — A fast all-in-one JavaScript runtime
Last scanned Jul 26, 2026, 11:19 AM
Overall score
Excellent
Summary
A fast all-in-one JavaScript runtime and toolkit. This website uses Plausible Analytics hosted on Cloudflare behind Cloudflare CDN. SEO is excellent (90/100) and accessibility is excellent (100/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Meta description longer than 160 characters.
Bun
A fast all-in-one JavaScript runtime and toolkit
- United States
- Hosted on Cloudflare
Top issues to fix
5 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.
Missing OpenGraph tags
SEOAdd og:title/og:description/og:image so shared links render a proper preview card.
SEO
2 issue(s) found
Performance
157 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
Contact
Email, phone, and address published on this site's own pages.
- alice@example.com
Meta tags
- Title
- Bun — A fast all-in-one JavaScript runtime
- Description
- Bundle, install, and run JavaScript & TypeScript — all in Bun. Bun is a new JavaScript runtime with a native bundler, transpiler, task runner, and npm client built-in.
- Canonical
- https://bun.com
- Language
- en
- Charset
- UTF-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
- https://bun.sh/manifest.json
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- Cloudflare
- CDN provider
- Cloudflare
- IP address
- 172.67.70.226
- 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
- bun.sh
- Valid from
- Jun 26, 2026
- Valid to
- Sep 24, 2026
- Days until expiry
- 57
- SAN domains
- bun.sh, *.bun.sh
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 13 · H3 24
Links
72 internal · 7 external · 0 broken
Images
21 total · 1 missing alt
Scripts / Styles
11 scripts · 2 stylesheets
JS / CSS size
32.4 KB · 0 B
Page size
283 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 1
- sitemap.xml
- Found
- URLs in sitemap
- 17716
SEO issues
- Meta description longer than 160 characters
- Missing OpenGraph tags
Accessibility issues
No accessibility issues detected.
Careers
This company has an active careers page, but individual openings weren't reliably parsed from it — visit the page above for current listings.
Scan details
- Requested URL
- https://bun.sh
- Final URL
- https://bun.sh
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 152 ms
- HTML size
- 283 KB
- Redirect chain
- https://bun.sh
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does bun.sh use?
- bun.sh is built with Google Analytics, Plausible Analytics, Cloudflare Analytics.
- Is bun.sh secure (HTTPS)?
- Yes. bun.sh uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Sep 24, 2026.
- Who hosts bun.sh?
- bun.sh is hosted on Cloudflare, behind Cloudflare CDN.
- What is bun.sh's SEO score?
- bun.sh scored 90/100 for SEO in the latest analysis (excellent).
- What is bun.sh's overall website score?
- bun.sh has an overall SiteGraph score of 91/100, combining SEO, performance, security, and accessibility.
- What company operates bun.sh?
- bun.sh is operated by Bun. A fast all-in-one JavaScript runtime and toolkit
- Is bun.sh hiring?
- bun.sh has a careers page; check it directly for current openings.
OpenGraph & Twitter Card
OpenGraph
Twitter Card