fix: convert anchor links in readme content to lowercase

[thasmo]

This fixes #1008 for now, but later we should consider preserving text casing for anchor links for better compatibility.

• Generated TOC dropdown works
• Inline TOC works

Examples

• https://npmxdev-git-fork-thasmo-readme-lowercase-anchor-links-npmx.vercel.app/package/nuxt
• https://npmxdev-git-fork-thasmo-readme-lowercase-anchor-links-npmx.vercel.app/package/@wojtekmaj/opening-hours-utils

[vercel]

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Project	Deployment	Actions	Updated (UTC)
npmx.dev	Ready	Preview, Comment	Feb 9, 2026 8:11pm

2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs.npmx.dev	Ignored	Preview	Feb 9, 2026 8:11pm
npmx-lunaria	Ignored		Feb 9, 2026 8:11pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request modifies the readme utility to improve hash link functionality. The change transforms the href attribute of anchor tags to lowercase when the href starts with a hash symbol. This addresses an issue where README hash links do not navigate to their corresponding sections. The modification is minimal, affecting only the link rendering logic whilst preserving all other attributes and link behaviour.

Possibly related PRs

• fix: readme rendering result lacks anchor point jump #994: Also fixes README anchor and hash behaviour in server/utils/readme.ts by adding id-prefixes and sanitiser rules for element ids as an alternative approach to restoring anchor jumps.

Suggested reviewers

• danielroe

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The code change converts anchor link hrefs to lowercase, which addresses the root cause of hash links not working due to case-sensitivity mismatches between TOC links and section anchors.
Out of Scope Changes check	✅ Passed	The changes are minimal and focused solely on fixing anchor link rendering by converting hash hrefs to lowercase, with no unrelated modifications.
Description check	✅ Passed	The pull request description clearly relates to the changeset by explaining the fix for issue #1008 regarding anchor links in README content, including examples and notes about TOC functionality.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[danielroe]

there may be some other things in #1013 we can pull in too