# Link Checker

> Use when reviewing templates, rendered HTML, or shared components related to Check for broken links. Validate the final browser-facing markup, not just the source framework abstraction.

- Skill: `thedaviddias/link-checker` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add thedaviddias/link-checker`
- Raw SKILL.md: https://api.skillmd.com/api/skills/thedaviddias/link-checker/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Web & Frontend
- Author: thedaviddias (https://skillmd.com/u/thedaviddias)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/thedaviddias/link-checker

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# Check for broken links

Broken links frustrate users, hurt SEO rankings (Google penalizes 404s), and damage credibility—especially for documentation and e-commerce sites.

## Quick Reference

- Use lychee, linkchecker, or broken-link-checker npm packages
- Check internal, external, anchor, and mailto links
- Integrate into CI/CD for automatic detection
- Set up regular monitoring for external link rot

## Check

Verify that all internal and external links are working properly and don't return 404 errors or redirect to unintended destinations.

## Fix

Use automated link checking tools to identify and fix broken links, update redirected URLs, and remove or replace dead links.

## Explain

Explain why broken links hurt user experience, SEO rankings, and credibility, and how to implement ongoing link monitoring.

## Code Review

Review templates, server-rendered HTML, and shared components that output markup related to Check for broken links. Flag exact elements, attributes, and routes where the rendered HTML violates the rule.

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For full implementation details, code examples, and framework-specific guidance,
see `references/rule.md`.

Rule page: https://frontendchecklist.io/en/rules/html/link-checker