What technology does esm.sh use?

esm.sh is built with Svelte, Google Analytics.

Is esm.sh secure (HTTPS)?

Yes. esm.sh uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Sep 19, 2026.

Hosting provider information for esm.sh is not available yet.

What is esm.sh's SEO score?

esm.sh scored 75/100 for SEO in the latest analysis (fair).

What is esm.sh's overall website score?

esm.sh has an overall SiteGraph score of 84/100, combining SEO, performance, security, and accessibility.

Has esm.sh's score changed over time?

esm.sh's overall score has declined by 1 point (from 85 to 84) since Jul 26, 2026.

esm.sh

ESM>CDN

Last scanned Aug 2, 2026, 3:00 AM · 10 views

Overall score

Great

Summary

A fast, smart & global CDN for modern(es2015+) web development. This website uses Google Analytics behind Cloudflare CDN. SEO is good (75/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Missing canonical link.

A fast, smart & global CDN for modern(es2015+) web development.

Top issues to fix

9 issues found · 2 high priority

Missing Strict-Transport-Security header
Security
Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
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.
Missing canonical link
SEO
Add <link rel="canonical"> so search engines know which URL variant to index.
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.

SEO

4 issue(s) found

100

Performance

14 ms

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Score history

-1 overall since Jul 26, 2026

Overall: 84
SEO: 75
Security: 65
Performance: 100
Accessibility: 100

Organization

Company details published in this site's own structured data.

A fast, smart & global CDN for modern(es2015+) web development.

GitHub

Meta tags

Title: ESM>CDN
Description: A fast, smart & global CDN for modern(es2015+) web development.
Canonical
Language: en
Charset: UTF-8
Viewport: width=device-width, initial-scale=1.0
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

Svelte Google Analytics

Hosting & CDN

Hosting provider: —
CDN provider: Cloudflare
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.3
Issuer: Google Trust Services
Subject: esm.sh
Valid from: Jun 21, 2026
Valid to: Sep 19, 2026
Days until expiry: 48
SAN domains: esm.sh, *.esm.sh

Security headers

Strict-Transport-SecurityMissing
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 6 · H3 18

Links

2 internal · 27 external · 20 broken

Images

4 total · 0 missing alt

Scripts / Styles

4 scripts · 1 stylesheets

JS / CSS size

237 B · 0 B

Page size

66.1 KB

Robots.txt & Sitemap

robots.txt: Not found
Disallow rules: 0
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

Missing canonical link
No structured data (JSON-LD) found
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://esm.sh
Final URL: https://esm.sh
HTTP status: 200
HTTP version: HTTP/2
Response time: 13 ms
HTML size: 66.1 KB
Redirect chain: https://esm.sh

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does esm.sh use?: esm.sh is built with Svelte, Google Analytics.
Is esm.sh secure (HTTPS)?: Yes. esm.sh uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Sep 19, 2026.
Who hosts esm.sh?: Hosting provider information for esm.sh is not available yet.
What is esm.sh's SEO score?: esm.sh scored 75/100 for SEO in the latest analysis (fair).
What is esm.sh's overall website score?: esm.sh has an overall SiteGraph score of 84/100, combining SEO, performance, security, and accessibility.
Has esm.sh's score changed over time?: esm.sh's overall score has declined by 1 point (from 85 to 84) since Jul 26, 2026.

Top issues to fix

Score history

Organization

Meta tags

OpenGraph & Twitter Card

Technologies

Hosting & CDN

DNS records

TLS / SSL certificate

Security headers

Content & assets

Robots.txt & Sitemap

SEO issues

Accessibility issues

Scan details

Related websites

Frequently asked questions