Astro Broken Links Checker

An Astro integration that checks for broken links in your website during static builds. It validates internal links (and optionally external ones), logging any broken links to both the console and a file.

Installation

npm install astro-broken-links-checker

Then add it to your astro.config.mjs:

import { defineConfig } from 'astro/config';
import astroBrokenLinksChecker from 'astro-broken-links-checker';

export default defineConfig({
  integrations: [
    astroBrokenLinksChecker({
      checkExternalLinks: true, // default: false
      throwError: true,         // default: false
    }),
  ],
});

Options

Option	Type	Default	Description
checkExternalLinks	boolean	false	Also check external (http/https) links via HTTP requests.
cacheExternalLinks	boolean	true	Cache verified external links to disk to speed up subsequent builds.
throwError	boolean	false	Fail the build if any broken links are found.
linkCheckerDir	string	'.link-checker'	Directory for cache and log files.

Features

• Checks <a href> and <img src> references in all built HTML pages.
• Deduplication: Each unique link is checked only once across all pages.
• Parallel processing: Pages (up to 50 concurrent) and HTTP requests (up to 10 concurrent) run in parallel.
• Base path support: Respects Astro's base config, stripping the prefix before checking file existence.
• Redirect awareness: Follows redirects defined in astro.config.mjs.
• Trailing slash enforcement: Respects Astro's trailingSlash setting and flags links that violate it.
• Timeouts and retries: External link checks have a 3-second timeout. ECONNRESET and timeout failures are retried up to 3 times with exponential backoff.
• Disk caching: Verified external links are cached to .link-checker/verified-external-links.tsv. Commit this file to skip re-checking on CI.

Output

The integration creates a .link-checker directory containing:

• verified-external-links.tsv — Cache of verified external links (TSV: URL, status, statusCode, timestamp). Commit this to git to avoid re-checking on CI.
• broken-links.log — Broken links found during the build (gitignored automatically).

Compatibility

• Node.js: 18+
• Astro: 4.x and 5.x

License

Apache-2.0