What technology does library.io use?

library.io is built with Express, Node.js.

Is library.io secure (HTTPS)?

Yes. library.io uses TLS 1.3 with a certificate issued by DigiCert Inc, valid until Feb 2, 2027.

Who hosts library.io?

Hosting provider information for library.io is not available yet.

What is library.io's SEO score?

library.io scored 55/100 for SEO in the latest analysis (fair).

What is library.io's overall website score?

library.io has an overall SiteGraph score of 70/100, combining SEO, performance, security, and accessibility.

library.io

dropdown_triangle

Last scanned Aug 24, 2026, 1:21 PM

Overall score

Fair

Summary

This website uses Express behind CloudFront CDN. SEO is fair (55/100) and accessibility is fair (50/100). Security scores good (85/100) and performance excellent (90/100). Top issue: Missing meta description.

Top issues to fix

10 issues found · 4 high priority

Missing Strict-Transport-Security header
Security
Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing meta description
SEO
Add a ~150-character meta description to control your search-result snippet and lift click-through rate.
No H1 heading found
SEO
Add exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
Over half of images are missing alt text
Accessibility
Add alt attributes to images — screen readers depend on them, and they help image SEO.
Missing X-Content-Type-Options header
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing canonical link
SEO
Add <link rel="canonical"> so search engines know which URL variant to index.

+4 more issues — details in the sections below.

SEO

6 issue(s) found

Performance

1.05 s

Security

HTTPS & header checks

Accessibility

3 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.

Meta tags

Title: dropdown_triangle
Description
Canonical
Language
Charset: utf-8
Viewport: width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no, minimal-ui
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

Express Node.js

Hosting & CDN

Hosting provider: —
CDN provider: CloudFront
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: DigiCert Inc
Subject: *.library.io
Valid from: Jan 7, 2026
Valid to: Feb 2, 2027
Days until expiry: 162
SAN domains: *.library.io, library.io

Security headers

Strict-Transport-SecurityMissing
Content-Security-PolicyEnabled
X-Frame-OptionsEnabled
X-Content-Type-OptionsMissing
Referrer-PolicyMissing
Permissions-PolicyMissing

Compression: none · 0 cookie(s) observed

Content & assets

Headings

H1 0 · H2 1 · H3 0

Links

0 internal · 0 external · 0 broken

Images

1 total · 1 missing alt

Scripts / Styles

5 scripts · 2 stylesheets

JS / CSS size

849 B · 0 B

Page size

16.5 KB

Robots.txt & Sitemap

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

SEO issues

Missing meta description
Missing canonical link
No H1 heading found
No structured data (JSON-LD) found
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://library.io
Final URL: https://library.io
HTTP status: 200
HTTP version: HTTP/2
Response time: 1.05 s
HTML size: 16.5 KB
Redirect chain: https://library.io

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does library.io use?: library.io is built with Express, Node.js.
Is library.io secure (HTTPS)?: Yes. library.io uses TLS 1.3 with a certificate issued by DigiCert Inc, valid until Feb 2, 2027.
Who hosts library.io?: Hosting provider information for library.io is not available yet.
What is library.io's SEO score?: library.io scored 55/100 for SEO in the latest analysis (fair).
What is library.io's overall website score?: library.io has an overall SiteGraph score of 70/100, combining SEO, performance, security, and accessibility.