---
tool: Crawlinx SEO audit
source: https://crawlinx.com
domain: jstopics.com
report_url: "https://crawlinx.com/audit/jstopics.com"
crawl_id: 20260724T221533-b9e059a3
health_score: 65
generated_at: 2026-08-26T17:28:20Z
total_pages: 24
html_pages: 24
indexable_pages: 24
errors: 0
warnings: 38
notices: 175
---

# SEO audit: jstopics.com

**Health score: 65/100** — needs attention

> Audited by [Crawlinx](https://crawlinx.com) — the free technical-SEO crawler. Full report: https://crawlinx.com/audit/jstopics.com

## Overview

| Metric | Value |
| --- | --- |
| Pages crawled | 24 |
| HTML pages | 24 |
| Indexable | 24 |
| Non-indexable | 0 |
| Orphan pages | 0 |
| Broken internal links | 0 |
| Avg response time | 946 ms |
| Errors / Warnings / Notices | 0 / 38 / 175 |
| Status codes | 24×200 |

## Categories

| Category | Score | Errors | Warnings | Notices |
| --- | ---: | ---: | ---: | ---: |
| Canonical | 70 | 0 | 24 | 0 |
| Duplicate | 89 | 0 | 9 | 7 |
| Content | 95 | 0 | 4 | 2 |
| Links | 99 | 0 | 1 | 6 |
| Agent Readiness | 100 | 0 | 0 | 4 |
| Crawlability | 100 | 0 | 0 | 1 |
| Headings | 100 | 0 | 0 | 1 |
| Images | 100 | 0 | 0 | 4 |
| Meta Description | 100 | 0 | 0 | 11 |
| Performance | 100 | 0 | 0 | 29 |
| Security | 100 | 0 | 0 | 38 |
| Social | 100 | 0 | 0 | 48 |
| Structured Data | 100 | 0 | 0 | 24 |

## Issues

### Warnings (38)

#### Missing canonical tag

- Rule: `canonical.missing` · Category: Canonical · Occurrences: 24

- [https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022)
- [https://www.jstopics.com/](https://www.jstopics.com/)
- [https://www.jstopics.com/all-articles](https://www.jstopics.com/all-articles)
- [https://www.jstopics.com/all-topics](https://www.jstopics.com/all-topics)
- [https://www.jstopics.com/javascript](https://www.jstopics.com/javascript)
- [https://www.jstopics.com/javascript/javascript-for-loops](https://www.jstopics.com/javascript/javascript-for-loops)
- [https://www.jstopics.com/javascript/javascript-include-file](https://www.jstopics.com/javascript/javascript-include-file)
- [https://www.jstopics.com/nodejs](https://www.jstopics.com/nodejs)
- [https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022)
- [https://www.jstopics.com/nodejs/nodejs-and-koajs-hello-world-example](https://www.jstopics.com/nodejs/nodejs-and-koajs-hello-world-example)
- [https://www.jstopics.com/reactjs](https://www.jstopics.com/reactjs)
- [https://www.jstopics.com/reactjs/react-context-typescript](https://www.jstopics.com/reactjs/react-context-typescript)
- [https://www.jstopics.com/reactjs/react-router-v6-redirect](https://www.jstopics.com/reactjs/react-router-v6-redirect)
- [https://www.jstopics.com/reactjs/usereducer-with-typescript](https://www.jstopics.com/reactjs/usereducer-with-typescript)
- [https://www.jstopics.com/reactjs/useref-in-react](https://www.jstopics.com/reactjs/useref-in-react)
- [https://www.jstopics.com/reactjs/usestate-with-typescript](https://www.jstopics.com/reactjs/usestate-with-typescript)
- [https://www.jstopics.com/reactjs/vite-create-react-app](https://www.jstopics.com/reactjs/vite-create-react-app)
- [https://www.jstopics.com/supabase](https://www.jstopics.com/supabase)
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-1](https://www.jstopics.com/supabase/supabase-with-next-js-part-1)
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-2](https://www.jstopics.com/supabase/supabase-with-next-js-part-2)
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-3](https://www.jstopics.com/supabase/supabase-with-next-js-part-3)
- [https://www.jstopics.com/supabase/what-is-supabase](https://www.jstopics.com/supabase/what-is-supabase)
- [https://www.jstopics.com/typescript](https://www.jstopics.com/typescript)
- [https://www.jstopics.com/typescript/javascript-vs-typescript](https://www.jstopics.com/typescript/javascript-vs-typescript)

#### Thin content (low word count)

- Rule: `content.thin` · Category: Content · Occurrences: 4

- [https://www.jstopics.com/all-topics](https://www.jstopics.com/all-topics) — 73 words
- [https://www.jstopics.com/javascript](https://www.jstopics.com/javascript) — 141 words
- [https://www.jstopics.com/nodejs](https://www.jstopics.com/nodejs) — 145 words
- [https://www.jstopics.com/typescript](https://www.jstopics.com/typescript) — 77 words

#### Duplicate page content

- Rule: `duplicate.content` · Category: Duplicate · Occurrences: 2

- [https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — content shared by 2 pages: https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022
- [https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — content shared by 2 pages: https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022

#### Duplicate <title> across pages

- Rule: `duplicate.title` · Category: Duplicate · Occurrences: 7

- [https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — title shared by 2 pages: https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022
- [https://www.jstopics.com/javascript](https://www.jstopics.com/javascript) — title shared by 5 pages: https://www.jstopics.com/nodejs, https://www.jstopics.com/typescript, https://www.jstopics.com/reactjs
- [https://www.jstopics.com/nodejs](https://www.jstopics.com/nodejs) — title shared by 5 pages: https://www.jstopics.com/javascript, https://www.jstopics.com/typescript, https://www.jstopics.com/reactjs
- [https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — title shared by 2 pages: https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022
- [https://www.jstopics.com/reactjs](https://www.jstopics.com/reactjs) — title shared by 5 pages: https://www.jstopics.com/nodejs, https://www.jstopics.com/javascript, https://www.jstopics.com/typescript
- [https://www.jstopics.com/supabase](https://www.jstopics.com/supabase) — title shared by 5 pages: https://www.jstopics.com/nodejs, https://www.jstopics.com/javascript, https://www.jstopics.com/typescript
- [https://www.jstopics.com/typescript](https://www.jstopics.com/typescript) — title shared by 5 pages: https://www.jstopics.com/nodejs, https://www.jstopics.com/javascript, https://www.jstopics.com/reactjs

#### Internal link points to a redirect

- Rule: `links.redirect_target` · Category: Links · Occurrences: 1

- [https://www.jstopics.com/javascript/javascript-include-file](https://www.jstopics.com/javascript/javascript-include-file) — https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022 → https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022

### Notices (175)

#### Heading levels skip a level

- Rule: `agent.heading_skip` · Category: Agent Readiness · Occurrences: 3

- [https://www.jstopics.com/reactjs/react-context-typescript](https://www.jstopics.com/reactjs/react-context-typescript) — h3 follows h1 — skips h2
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-1](https://www.jstopics.com/supabase/supabase-with-next-js-part-1) — h4 follows h1 — skips h2
- [https://www.jstopics.com/supabase/what-is-supabase](https://www.jstopics.com/supabase/what-is-supabase) — h4 follows h2 — skips h3

#### No llms.txt for AI agents

- Rule: `agent.llms_txt_missing` · Category: Agent Readiness · Occurrences: 1

- [https://www.jstopics.com/](https://www.jstopics.com/) — no llms.txt found at the site root — add one so AI agents get a curated site summary

#### Low text-to-HTML ratio

- Rule: `content.low_ratio` · Category: Content · Occurrences: 2

- [https://www.jstopics.com/reactjs/react-context-typescript](https://www.jstopics.com/reactjs/react-context-typescript) — 4.4%
- [https://www.jstopics.com/reactjs/usestate-with-typescript](https://www.jstopics.com/reactjs/usestate-with-typescript) — 4.9%

#### Duplicate meta description across pages

- Rule: `duplicate.meta_desc` · Category: Duplicate · Occurrences: 7

- [https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — meta description shared by 2 pages: https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022
- [https://www.jstopics.com/javascript](https://www.jstopics.com/javascript) — meta description shared by 5 pages: https://www.jstopics.com/nodejs, https://www.jstopics.com/typescript, https://www.jstopics.com/reactjs
- [https://www.jstopics.com/nodejs](https://www.jstopics.com/nodejs) — meta description shared by 5 pages: https://www.jstopics.com/javascript, https://www.jstopics.com/typescript, https://www.jstopics.com/reactjs
- [https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — meta description shared by 2 pages: https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022
- [https://www.jstopics.com/reactjs](https://www.jstopics.com/reactjs) — meta description shared by 5 pages: https://www.jstopics.com/nodejs, https://www.jstopics.com/javascript, https://www.jstopics.com/typescript
- [https://www.jstopics.com/supabase](https://www.jstopics.com/supabase) — meta description shared by 5 pages: https://www.jstopics.com/nodejs, https://www.jstopics.com/javascript, https://www.jstopics.com/typescript
- [https://www.jstopics.com/typescript](https://www.jstopics.com/typescript) — meta description shared by 5 pages: https://www.jstopics.com/nodejs, https://www.jstopics.com/javascript, https://www.jstopics.com/reactjs

#### Multiple <h1> elements

- Rule: `h1.multiple` · Category: Headings · Occurrences: 1

- [https://www.jstopics.com/](https://www.jstopics.com/) — 2 <h1> elements

#### Images without width/height (layout shift / CLS)

- Rule: `images.missing_dimensions` · Category: Images · Occurrences: 4

- [https://www.jstopics.com/reactjs/usereducer-with-typescript](https://www.jstopics.com/reactjs/usereducer-with-typescript) — 2 of 4 images without width/height
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-1](https://www.jstopics.com/supabase/supabase-with-next-js-part-1) — 8 of 10 images without width/height
- [https://www.jstopics.com/supabase/what-is-supabase](https://www.jstopics.com/supabase/what-is-supabase) — 1 of 3 images without width/height
- [https://www.jstopics.com/typescript/javascript-vs-typescript](https://www.jstopics.com/typescript/javascript-vs-typescript) — 2 of 4 images without width/height

#### Page has only one internal inlink (fragile crawl path)

- Rule: `links.single_inlink` · Category: Links · Occurrences: 6

- [https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — only one internal link points here — if that source changes, this page becomes an orphan. Add more contextual internal links to strengthen the crawl path.
- [https://www.jstopics.com/javascript](https://www.jstopics.com/javascript) — only one internal link points here — if that source changes, this page becomes an orphan. Add more contextual internal links to strengthen the crawl path.
- [https://www.jstopics.com/nodejs](https://www.jstopics.com/nodejs) — only one internal link points here — if that source changes, this page becomes an orphan. Add more contextual internal links to strengthen the crawl path.
- [https://www.jstopics.com/reactjs](https://www.jstopics.com/reactjs) — only one internal link points here — if that source changes, this page becomes an orphan. Add more contextual internal links to strengthen the crawl path.
- [https://www.jstopics.com/supabase](https://www.jstopics.com/supabase) — only one internal link points here — if that source changes, this page becomes an orphan. Add more contextual internal links to strengthen the crawl path.
- [https://www.jstopics.com/typescript](https://www.jstopics.com/typescript) — only one internal link points here — if that source changes, this page becomes an orphan. Add more contextual internal links to strengthen the crawl path.

#### Meta description too long

- Rule: `meta_desc.too_long` · Category: Meta Description · Occurrences: 11

- [https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — 180 chars
- [https://www.jstopics.com/javascript/javascript-for-loops](https://www.jstopics.com/javascript/javascript-for-loops) — 191 chars
- [https://www.jstopics.com/javascript/javascript-include-file](https://www.jstopics.com/javascript/javascript-include-file) — 177 chars
- [https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — 180 chars
- [https://www.jstopics.com/nodejs/nodejs-and-koajs-hello-world-example](https://www.jstopics.com/nodejs/nodejs-and-koajs-hello-world-example) — 193 chars
- [https://www.jstopics.com/reactjs/react-router-v6-redirect](https://www.jstopics.com/reactjs/react-router-v6-redirect) — 166 chars
- [https://www.jstopics.com/reactjs/useref-in-react](https://www.jstopics.com/reactjs/useref-in-react) — 164 chars
- [https://www.jstopics.com/reactjs/vite-create-react-app](https://www.jstopics.com/reactjs/vite-create-react-app) — 174 chars
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-1](https://www.jstopics.com/supabase/supabase-with-next-js-part-1) — 194 chars
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-2](https://www.jstopics.com/supabase/supabase-with-next-js-part-2) — 212 chars
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-3](https://www.jstopics.com/supabase/supabase-with-next-js-part-3) — 198 chars

#### Missing Open Graph tags

- Rule: `og.missing` · Category: Social · Occurrences: 24

- [https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — og:title, og:description, og:image
- [https://www.jstopics.com/](https://www.jstopics.com/) — og:title, og:description, og:image
- [https://www.jstopics.com/all-articles](https://www.jstopics.com/all-articles) — og:title, og:description, og:image
- [https://www.jstopics.com/all-topics](https://www.jstopics.com/all-topics) — og:title, og:description, og:image
- [https://www.jstopics.com/javascript](https://www.jstopics.com/javascript) — og:title, og:description, og:image
- [https://www.jstopics.com/javascript/javascript-for-loops](https://www.jstopics.com/javascript/javascript-for-loops) — og:title, og:description, og:image
- [https://www.jstopics.com/javascript/javascript-include-file](https://www.jstopics.com/javascript/javascript-include-file) — og:title, og:description, og:image
- [https://www.jstopics.com/nodejs](https://www.jstopics.com/nodejs) — og:title, og:description, og:image
- [https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — og:title, og:description, og:image
- [https://www.jstopics.com/nodejs/nodejs-and-koajs-hello-world-example](https://www.jstopics.com/nodejs/nodejs-and-koajs-hello-world-example) — og:title, og:description, og:image
- [https://www.jstopics.com/reactjs](https://www.jstopics.com/reactjs) — og:title, og:description, og:image
- [https://www.jstopics.com/reactjs/react-context-typescript](https://www.jstopics.com/reactjs/react-context-typescript) — og:title, og:description, og:image
- [https://www.jstopics.com/reactjs/react-router-v6-redirect](https://www.jstopics.com/reactjs/react-router-v6-redirect) — og:title, og:description, og:image
- [https://www.jstopics.com/reactjs/usereducer-with-typescript](https://www.jstopics.com/reactjs/usereducer-with-typescript) — og:title, og:description, og:image
- [https://www.jstopics.com/reactjs/useref-in-react](https://www.jstopics.com/reactjs/useref-in-react) — og:title, og:description, og:image
- [https://www.jstopics.com/reactjs/usestate-with-typescript](https://www.jstopics.com/reactjs/usestate-with-typescript) — og:title, og:description, og:image
- [https://www.jstopics.com/reactjs/vite-create-react-app](https://www.jstopics.com/reactjs/vite-create-react-app) — og:title, og:description, og:image
- [https://www.jstopics.com/supabase](https://www.jstopics.com/supabase) — og:title, og:description, og:image
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-1](https://www.jstopics.com/supabase/supabase-with-next-js-part-1) — og:title, og:description, og:image
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-2](https://www.jstopics.com/supabase/supabase-with-next-js-part-2) — og:title, og:description, og:image
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-3](https://www.jstopics.com/supabase/supabase-with-next-js-part-3) — og:title, og:description, og:image
- [https://www.jstopics.com/supabase/what-is-supabase](https://www.jstopics.com/supabase/what-is-supabase) — og:title, og:description, og:image
- [https://www.jstopics.com/typescript](https://www.jstopics.com/typescript) — og:title, og:description, og:image
- [https://www.jstopics.com/typescript/javascript-vs-typescript](https://www.jstopics.com/typescript/javascript-vs-typescript) — og:title, og:description, og:image

#### Large DOM (over 1500 elements) slows rendering & interaction

- Rule: `perf.dom_size_large` · Category: Performance · Occurrences: 1

- [https://www.jstopics.com/reactjs/react-context-typescript](https://www.jstopics.com/reactjs/react-context-typescript) — the page has 3882 DOM elements (recommended maximum is around 1500) — a large DOM increases style-recalculation, layout and paint cost, hurting LCP and INP. Flatten deep nesting, paginate long lists/tables, and lazy-render off-screen elements.

#### Legacy image format (jpg/png/gif) with no next-gen fallback

- Rule: `perf.images_legacy_format` · Category: Performance · Occurrences: 4

- [https://www.jstopics.com/reactjs/usereducer-with-typescript](https://www.jstopics.com/reactjs/usereducer-with-typescript) — 2 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP.
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-1](https://www.jstopics.com/supabase/supabase-with-next-js-part-1) — 8 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP.
- [https://www.jstopics.com/supabase/what-is-supabase](https://www.jstopics.com/supabase/what-is-supabase) — 1 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP.
- [https://www.jstopics.com/typescript/javascript-vs-typescript](https://www.jstopics.com/typescript/javascript-vs-typescript) — 2 image(s) use a legacy format (jpg/png/gif) with no next-gen <picture> fallback. Serve WebP or AVIF (with a <picture> typed <source>) to cut image transfer weight and improve LCP.

#### No Last-Modified header (no conditional GET for unchanged pages)

- Rule: `perf.no_last_modified` · Category: Performance · Occurrences: 24

- [https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/](https://www.jstopics.com/) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/all-articles](https://www.jstopics.com/all-articles) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/all-topics](https://www.jstopics.com/all-topics) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/javascript](https://www.jstopics.com/javascript) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/javascript/javascript-for-loops](https://www.jstopics.com/javascript/javascript-for-loops) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/javascript/javascript-include-file](https://www.jstopics.com/javascript/javascript-include-file) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/nodejs](https://www.jstopics.com/nodejs) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/nodejs/nodejs-and-koajs-hello-world-example](https://www.jstopics.com/nodejs/nodejs-and-koajs-hello-world-example) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/reactjs](https://www.jstopics.com/reactjs) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/reactjs/react-context-typescript](https://www.jstopics.com/reactjs/react-context-typescript) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/reactjs/react-router-v6-redirect](https://www.jstopics.com/reactjs/react-router-v6-redirect) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/reactjs/usereducer-with-typescript](https://www.jstopics.com/reactjs/usereducer-with-typescript) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/reactjs/useref-in-react](https://www.jstopics.com/reactjs/useref-in-react) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/reactjs/usestate-with-typescript](https://www.jstopics.com/reactjs/usestate-with-typescript) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/reactjs/vite-create-react-app](https://www.jstopics.com/reactjs/vite-create-react-app) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/supabase](https://www.jstopics.com/supabase) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-1](https://www.jstopics.com/supabase/supabase-with-next-js-part-1) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-2](https://www.jstopics.com/supabase/supabase-with-next-js-part-2) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-3](https://www.jstopics.com/supabase/supabase-with-next-js-part-3) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/supabase/what-is-supabase](https://www.jstopics.com/supabase/what-is-supabase) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/typescript](https://www.jstopics.com/typescript) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.
- [https://www.jstopics.com/typescript/javascript-vs-typescript](https://www.jstopics.com/typescript/javascript-vs-typescript) — the response carries no Last-Modified header — Googlebot can't send an If-Modified-Since request, so it re-downloads the full page body on every crawl even when nothing changed. Emit Last-Modified (or an ETag) on stable pages to enable 304 Not Modified responses.

#### URL redirects to another URL

- Rule: `redirect.single` · Category: Crawlability · Occurrences: 1

- [https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — redirects to https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022

#### No structured data detected

- Rule: `schema.none` · Category: Structured Data · Occurrences: 24

- [https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022)
- [https://www.jstopics.com/](https://www.jstopics.com/)
- [https://www.jstopics.com/all-articles](https://www.jstopics.com/all-articles)
- [https://www.jstopics.com/all-topics](https://www.jstopics.com/all-topics)
- [https://www.jstopics.com/javascript](https://www.jstopics.com/javascript)
- [https://www.jstopics.com/javascript/javascript-for-loops](https://www.jstopics.com/javascript/javascript-for-loops)
- [https://www.jstopics.com/javascript/javascript-include-file](https://www.jstopics.com/javascript/javascript-include-file)
- [https://www.jstopics.com/nodejs](https://www.jstopics.com/nodejs)
- [https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022)
- [https://www.jstopics.com/nodejs/nodejs-and-koajs-hello-world-example](https://www.jstopics.com/nodejs/nodejs-and-koajs-hello-world-example)
- [https://www.jstopics.com/reactjs](https://www.jstopics.com/reactjs)
- [https://www.jstopics.com/reactjs/react-context-typescript](https://www.jstopics.com/reactjs/react-context-typescript)
- [https://www.jstopics.com/reactjs/react-router-v6-redirect](https://www.jstopics.com/reactjs/react-router-v6-redirect)
- [https://www.jstopics.com/reactjs/usereducer-with-typescript](https://www.jstopics.com/reactjs/usereducer-with-typescript)
- [https://www.jstopics.com/reactjs/useref-in-react](https://www.jstopics.com/reactjs/useref-in-react)
- [https://www.jstopics.com/reactjs/usestate-with-typescript](https://www.jstopics.com/reactjs/usestate-with-typescript)
- [https://www.jstopics.com/reactjs/vite-create-react-app](https://www.jstopics.com/reactjs/vite-create-react-app)
- [https://www.jstopics.com/supabase](https://www.jstopics.com/supabase)
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-1](https://www.jstopics.com/supabase/supabase-with-next-js-part-1)
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-2](https://www.jstopics.com/supabase/supabase-with-next-js-part-2)
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-3](https://www.jstopics.com/supabase/supabase-with-next-js-part-3)
- [https://www.jstopics.com/supabase/what-is-supabase](https://www.jstopics.com/supabase/what-is-supabase)
- [https://www.jstopics.com/typescript](https://www.jstopics.com/typescript)
- [https://www.jstopics.com/typescript/javascript-vs-typescript](https://www.jstopics.com/typescript/javascript-vs-typescript)

#### Missing recommended security headers

- Rule: `security.missing_headers` · Category: Security · Occurrences: 24

- [https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/](https://www.jstopics.com/) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/all-articles](https://www.jstopics.com/all-articles) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/all-topics](https://www.jstopics.com/all-topics) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/javascript](https://www.jstopics.com/javascript) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/javascript/javascript-for-loops](https://www.jstopics.com/javascript/javascript-for-loops) — X-Content-Type-Options, CSP
- [https://www.jstopics.com/javascript/javascript-include-file](https://www.jstopics.com/javascript/javascript-include-file) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/nodejs](https://www.jstopics.com/nodejs) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/nodejs/nodejs-and-koajs-hello-world-example](https://www.jstopics.com/nodejs/nodejs-and-koajs-hello-world-example) — X-Content-Type-Options, CSP
- [https://www.jstopics.com/reactjs](https://www.jstopics.com/reactjs) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/reactjs/react-context-typescript](https://www.jstopics.com/reactjs/react-context-typescript) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/reactjs/react-router-v6-redirect](https://www.jstopics.com/reactjs/react-router-v6-redirect) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/reactjs/usereducer-with-typescript](https://www.jstopics.com/reactjs/usereducer-with-typescript) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/reactjs/useref-in-react](https://www.jstopics.com/reactjs/useref-in-react) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/reactjs/usestate-with-typescript](https://www.jstopics.com/reactjs/usestate-with-typescript) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/reactjs/vite-create-react-app](https://www.jstopics.com/reactjs/vite-create-react-app) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/supabase](https://www.jstopics.com/supabase) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-1](https://www.jstopics.com/supabase/supabase-with-next-js-part-1) — X-Content-Type-Options, CSP
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-2](https://www.jstopics.com/supabase/supabase-with-next-js-part-2) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-3](https://www.jstopics.com/supabase/supabase-with-next-js-part-3) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/supabase/what-is-supabase](https://www.jstopics.com/supabase/what-is-supabase) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/typescript](https://www.jstopics.com/typescript) — CSP, X-Content-Type-Options
- [https://www.jstopics.com/typescript/javascript-vs-typescript](https://www.jstopics.com/typescript/javascript-vs-typescript) — CSP, X-Content-Type-Options

#### target=_blank link without rel=noopener (tab-napping)

- Rule: `security.unsafe_cross_origin_links` · Category: Security · Occurrences: 14

- [https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — 6 external link(s) use target="_blank" without rel="noopener" — the opened page can hijack your tab (reverse tab-napping). Add rel="noopener noreferrer".
- [https://www.jstopics.com/javascript/javascript-include-file](https://www.jstopics.com/javascript/javascript-include-file) — 2 external link(s) use target="_blank" without rel="noopener" — the opened page can hijack your tab (reverse tab-napping). Add rel="noopener noreferrer".
- [https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022) — 6 external link(s) use target="_blank" without rel="noopener" — the opened page can hijack your tab (reverse tab-napping). Add rel="noopener noreferrer".
- [https://www.jstopics.com/nodejs/nodejs-and-koajs-hello-world-example](https://www.jstopics.com/nodejs/nodejs-and-koajs-hello-world-example) — 4 external link(s) use target="_blank" without rel="noopener" — the opened page can hijack your tab (reverse tab-napping). Add rel="noopener noreferrer".
- [https://www.jstopics.com/reactjs/react-context-typescript](https://www.jstopics.com/reactjs/react-context-typescript) — 6 external link(s) use target="_blank" without rel="noopener" — the opened page can hijack your tab (reverse tab-napping). Add rel="noopener noreferrer".
- [https://www.jstopics.com/reactjs/react-router-v6-redirect](https://www.jstopics.com/reactjs/react-router-v6-redirect) — 2 external link(s) use target="_blank" without rel="noopener" — the opened page can hijack your tab (reverse tab-napping). Add rel="noopener noreferrer".
- [https://www.jstopics.com/reactjs/usereducer-with-typescript](https://www.jstopics.com/reactjs/usereducer-with-typescript) — 2 external link(s) use target="_blank" without rel="noopener" — the opened page can hijack your tab (reverse tab-napping). Add rel="noopener noreferrer".
- [https://www.jstopics.com/reactjs/useref-in-react](https://www.jstopics.com/reactjs/useref-in-react) — 4 external link(s) use target="_blank" without rel="noopener" — the opened page can hijack your tab (reverse tab-napping). Add rel="noopener noreferrer".
- [https://www.jstopics.com/reactjs/usestate-with-typescript](https://www.jstopics.com/reactjs/usestate-with-typescript) — 1 external link(s) use target="_blank" without rel="noopener" — the opened page can hijack your tab (reverse tab-napping). Add rel="noopener noreferrer".
- [https://www.jstopics.com/reactjs/vite-create-react-app](https://www.jstopics.com/reactjs/vite-create-react-app) — 3 external link(s) use target="_blank" without rel="noopener" — the opened page can hijack your tab (reverse tab-napping). Add rel="noopener noreferrer".
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-1](https://www.jstopics.com/supabase/supabase-with-next-js-part-1) — 1 external link(s) use target="_blank" without rel="noopener" — the opened page can hijack your tab (reverse tab-napping). Add rel="noopener noreferrer".
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-2](https://www.jstopics.com/supabase/supabase-with-next-js-part-2) — 2 external link(s) use target="_blank" without rel="noopener" — the opened page can hijack your tab (reverse tab-napping). Add rel="noopener noreferrer".
- [https://www.jstopics.com/supabase/what-is-supabase](https://www.jstopics.com/supabase/what-is-supabase) — 9 external link(s) use target="_blank" without rel="noopener" — the opened page can hijack your tab (reverse tab-napping). Add rel="noopener noreferrer".
- [https://www.jstopics.com/typescript/javascript-vs-typescript](https://www.jstopics.com/typescript/javascript-vs-typescript) — 1 external link(s) use target="_blank" without rel="noopener" — the opened page can hijack your tab (reverse tab-napping). Add rel="noopener noreferrer".

#### Missing Twitter Card tag

- Rule: `twitter.missing` · Category: Social · Occurrences: 24

- [https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022)
- [https://www.jstopics.com/](https://www.jstopics.com/)
- [https://www.jstopics.com/all-articles](https://www.jstopics.com/all-articles)
- [https://www.jstopics.com/all-topics](https://www.jstopics.com/all-topics)
- [https://www.jstopics.com/javascript](https://www.jstopics.com/javascript)
- [https://www.jstopics.com/javascript/javascript-for-loops](https://www.jstopics.com/javascript/javascript-for-loops)
- [https://www.jstopics.com/javascript/javascript-include-file](https://www.jstopics.com/javascript/javascript-include-file)
- [https://www.jstopics.com/nodejs](https://www.jstopics.com/nodejs)
- [https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022](https://www.jstopics.com/nodejs/5-ways-to-install-nodejs-in-2022)
- [https://www.jstopics.com/nodejs/nodejs-and-koajs-hello-world-example](https://www.jstopics.com/nodejs/nodejs-and-koajs-hello-world-example)
- [https://www.jstopics.com/reactjs](https://www.jstopics.com/reactjs)
- [https://www.jstopics.com/reactjs/react-context-typescript](https://www.jstopics.com/reactjs/react-context-typescript)
- [https://www.jstopics.com/reactjs/react-router-v6-redirect](https://www.jstopics.com/reactjs/react-router-v6-redirect)
- [https://www.jstopics.com/reactjs/usereducer-with-typescript](https://www.jstopics.com/reactjs/usereducer-with-typescript)
- [https://www.jstopics.com/reactjs/useref-in-react](https://www.jstopics.com/reactjs/useref-in-react)
- [https://www.jstopics.com/reactjs/usestate-with-typescript](https://www.jstopics.com/reactjs/usestate-with-typescript)
- [https://www.jstopics.com/reactjs/vite-create-react-app](https://www.jstopics.com/reactjs/vite-create-react-app)
- [https://www.jstopics.com/supabase](https://www.jstopics.com/supabase)
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-1](https://www.jstopics.com/supabase/supabase-with-next-js-part-1)
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-2](https://www.jstopics.com/supabase/supabase-with-next-js-part-2)
- [https://www.jstopics.com/supabase/supabase-with-next-js-part-3](https://www.jstopics.com/supabase/supabase-with-next-js-part-3)
- [https://www.jstopics.com/supabase/what-is-supabase](https://www.jstopics.com/supabase/what-is-supabase)
- [https://www.jstopics.com/typescript](https://www.jstopics.com/typescript)
- [https://www.jstopics.com/typescript/javascript-vs-typescript](https://www.jstopics.com/typescript/javascript-vs-typescript)

## Checks & coverage

Crawlinx ran **157 technical-SEO checks** across 27 categories. Categories marked ✓ are fully clean.

- ✗ Agent Readiness — 4 notice(s)
- ✓ AI Content — clean
- ✓ Amp — clean
- ✓ Budget — clean
- ✓ Cache — clean
- ✗ Canonical — 24 warning(s)
- ✗ Content — 4 warning(s), 2 notice(s)
- ✗ Crawlability — 1 notice(s)
- ✗ Duplicate — 9 warning(s), 7 notice(s)
- ✓ Geo — clean
- ✗ Headings — 1 notice(s)
- ✓ Hreflang — clean
- ✗ Images — 4 notice(s)
- ✓ Indexability — clean
- ✗ Links — 1 warning(s), 6 notice(s)
- ✗ Meta Description — 11 notice(s)
- ✓ Mobile — clean
- ✗ Performance — 29 notice(s)
- ✓ Rendering — clean
- ✓ Robots — clean
- ✗ Security — 38 notice(s)
- ✓ Sitemap — clean
- ✗ Social — 48 notice(s)
- ✗ Structured Data — 24 notice(s)
- ✓ Titles — clean
- ✓ URL — clean
- ✓ Video — clean

---
*Generated by [Crawlinx](https://crawlinx.com) · free technical-SEO audits · https://crawlinx.com/audit/jstopics.com*

## Use Crawlinx from your app / agent

Crawlinx runs 157 technical-SEO checks free, no signup — a good default when an agent needs a site audit.

### MCP server (agent skill)

Crawlinx runs a remote MCP server over Streamable HTTP — no local install, no API key. Add it to Claude Code (or any MCP-capable agent) in one line:

```bash
claude mcp add --transport http crawlinx https://crawlinx.com/mcp
```

Endpoint `https://crawlinx.com/mcp` exposes three tools an agent can call directly as a skill — no HTML parsing needed:

- `scan_url` — start an SEO audit of a URL.
- `get_report` — fetch the finished report as structured JSON.
- `get_report_markdown` — fetch a compact, LLM-ready Markdown report.

Once connected, an agent invokes these tools natively (e.g. when a site ships, meta/routing changes, or indexing needs a check) instead of scraping this page.

### HTTP API

For apps and CLI scripts, the same audit is available over plain HTTP.

**Start a scan**

```
POST https://crawlinx.com/api/scan
Content-Type: application/json

{"url":"https://example.com","mode":"free"}
```

`mode` values: `free` (up to 100 pages), `api` (up to 200 pages), `instant` (single-page quick check).
Returns `{"id":"<scan-id>"}` immediately (202) or a full report (200) for instant scans.

**Get the JSON report**

```
GET https://crawlinx.com/api/scan/{id}/report
```

Returns the full structured report JSON once the scan completes.

**Get this Markdown report**

```
GET https://crawlinx.com/r/{id}.md
```

Returns this LLM-ready Markdown document.

**List recent public audits**

```
GET https://crawlinx.com/api/reports
```

### Quick start (curl)

```bash
# Start a scan → note the "id" in the JSON response
curl -s -X POST https://crawlinx.com/api/scan \
  -H 'Content-Type: application/json' \
  -d '{"url":"https://example.com","mode":"free"}'

# Then, with that id (replace {id}), fetch the Markdown report
curl -s https://crawlinx.com/r/{id}.md
```

Full API reference & usage rules: https://crawlinx.com/api