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prettier.io

Prettier · Opinionated Code Formatter · Prettier

Last scanned Jul 26, 2026, 11:19 AM

83

Overall score

Great

Summary

Opinionated Code Formatter. This website uses Google Analytics behind Netlify CDN. SEO is fair (70/100) and accessibility is excellent (90/100). Security scores good (75/100) and performance excellent (100/100). Top issue: No H1 heading found.

Opinionated Code Formatter

Top issues to fix

9 issues found · 2 high priority

  • Missing Content-Security-Policy header

    Security

    Add a CSP to control which sources can run scripts — the strongest single defense against XSS.

  • 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.

  • TLS certificate expires in 30 days

    Security

    Renew soon or enable auto-renewal to avoid a browser-warning outage.

  • 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.

  • 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.

70

SEO

4 issue(s) found

100

Performance

219 ms

75

Security

HTTPS & header checks

90

Accessibility

1 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.

Organization

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

Opinionated Code Formatter

X (Twitter)

Meta tags

Title
Prettier · Opinionated Code Formatter · Prettier
Description
Opinionated Code Formatter
Canonical
https://prettier.io/
Language
en
Charset
UTF-8
Viewport
width=device-width, initial-scale=1.0
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
Prettier · Opinionated Code Formatter · Prettier
og:description
Opinionated Code Formatter
og:type
—
og:url
https://prettier.io/

Twitter Card

twitter:card
summary_large_image
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

Google Analytics

Hosting & CDN

Hosting provider
—
CDN provider
Netlify
IP address
—
ASN
—

DNS records

TypeValue
A—
AAAA—
MX—
TXT—
NS—
CAA—
CNAME—
IPv6 supportNo

TLS / SSL certificate

Version
TLS 1.3
Issuer
Let's Encrypt
Subject
prettier.io
Valid from
May 30, 2026
Valid to
Aug 28, 2026
Days until expiry
30
SAN domains
prettier.io, www.prettier.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 0 · H2 6 · H3 8

Links

12 internal · 66 external · 20 broken

Images

32 total · 0 missing alt

Scripts / Styles

6 scripts · 2 stylesheets

JS / CSS size

1.8 KB · 0 B

Page size

28.8 KB

Robots.txt & Sitemap

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

SEO issues

  • No H1 heading found
  • No structured data (JSON-LD) found
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

  • No H1 heading found

Scan details

Requested URL
https://prettier.io
Final URL
https://prettier.io
HTTP status
200
HTTP version
HTTP/2
Response time
219 ms
HTML size
28.8 KB
Redirect chain
https://prettier.io

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does prettier.io use?
prettier.io is built with Google Analytics.
Is prettier.io secure (HTTPS)?
Yes. prettier.io uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Aug 28, 2026.
Who hosts prettier.io?
Hosting provider information for prettier.io is not available yet.
What is prettier.io's SEO score?
prettier.io scored 70/100 for SEO in the latest analysis (fair).
What is prettier.io's overall website score?
prettier.io has an overall SiteGraph score of 83/100, combining SEO, performance, security, and accessibility.