feat: code redirects - more npmjs.com URL parity by johnnyreilly · Pull Request #3269 · npmx-dev/npmx.dev

johnnyreilly · 2026-09-20T17:07:20Z

🔗 Linked issue

This PR is related to #2781 - it's a follow on

🧭 Context

Consider these pull requests: #2800 and its follow on #2975 (as I missed something in the initial PR)

These implemented versions redirects for npmx.dev to bring parity with npmjs.com URLs. This PR does a similar piece of work - this time regarding code view instead.

If you go to this URL you will see the code view of a package, eg: https://www.npmjs.com/package/webpack?activeTab=code

But if you go the npmx equivalent you will not: https://www.npmx.dev/package/webpack?activeTab=code

📚 Description

As with the versions view, we would like to 302 and redirect.

So https://www.npmx.dev/package/webpack?activeTab=code should redirect to
https://npmx.dev/package-code/webpack/v/5.111.1 where 5.111.1 is the latest version of a package.

This part is harder than the previous approach which did not require knowing the latest package version. Fortunately the middleware has something in place that seems to support this.

You can validate this works by going to the preview deployment here: https://npmx-43vih5w43-npmx.vercel.app/package/webpack?activeTab=code which redirects to https://npmx-43vih5w43-npmx.vercel.app/package-code/webpack/v/5.111.1

Likewise https://npmx-h96tfboc4-npmx.vercel.app/package/webpack/v/4.47.0?activeTab=code redirects to https://npmx-h96tfboc4-npmx.vercel.app/package-code/webpack/v/4.47.0

agentscanapp · 2026-09-20T17:07:25Z

Thanks for opening this pull request! 🎉

We really appreciate you taking the time to contribute, @johnnyreilly.

A maintainer will take a look as soon as they can. In the meantime, please make sure that:

the description explains what changed and why
any related issues are linked
existing tests still pass

If anything needs adjusting we'll leave comments here. Thanks again!

vercel · 2026-09-20T17:07:26Z

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coderabbitai · 2026-09-20T17:07:58Z

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server/middleware/canonical-redirects.global.ts

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server/middleware/canonical-redirects.global.ts

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📝 Summary

Summary by CodeRabbit

Bug Fixes
- Package URLs with activeTab=code now redirect to the canonical package-code page.
- Versioned URLs retain their specified version, while unversioned URLs resolve to the latest version.
- Redirects support standard and scoped packages, preserve other query parameters, and remove activeTab from the destination.
Tests
- Added end-to-end coverage for versioned and unversioned package-code redirects.

Walkthrough

The middleware redirects activeTab=code package URLs to versioned package-code URLs. Unversioned URLs use the latest version. Versioned URLs keep their pinned version. End-to-end tests cover scoped and unscoped packages.

Changes

Package code redirect

Layer / File(s)	Summary
Package code redirect and validation `server/middleware/canonical-redirects.global.ts`, `test/e2e/url-compatibility.spec.ts`	The middleware returns permanent 308 redirects for versioned package URLs and temporary 302 redirects for unversioned package URLs. It removes `activeTab`, preserves other query parameters, sets the cache-control header, and uses `fetchLatestVersion` for unversioned URLs. End-to-end tests cover scoped and unscoped packages, including pinned versions.

Priority: ⬇️ Low

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: adding code-view redirects to improve npmjs.com URL parity.
Description check	✅ Passed	The description explains the code-view redirect behaviour, target routes, version handling, redirect status, and validation examples. It is directly related to the changeset.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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codecov · 2026-09-20T17:08:48Z

Codecov Report

❌ Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
server/middleware/canonical-redirects.global.ts	0.00%	14 Missing and 3 partials ⚠️

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Inline comments:
In `@server/middleware/canonical-redirects.global.ts`:
- Line 81: Change the redirect status in the canonical redirect handler from 301
to 302, preserving the existing target and cache headers so clients do not
permanently cache a version-dependent redirect.

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43081j · 2026-09-21T07:23:57Z

I wonder if it should be a 301 or a 308? Since it is permanently redirected rather than temporarily redirected.

Do you know any reason we should treat it as temporary?

johnnyreilly · 2026-09-21T08:31:15Z

I had forgotten about 308!

That said, having had a quick read I'll confess to finding the differences between 301 Moved Permanently and 308 Permanent Redirect smallish. As I understand it 301's can turn a POST into a GET and 308s will not. So 308s seem nicer, though I'm not sure that particular benefit makes much difference for this use case.

For the sake of "I don't think I've ever used that status code" if nothing else, I've switched!

43081j · 2026-09-21T08:48:26Z

yup as far as i understand, 301 rewrites and 308 redirects (i.e. in 308 your method is carried over)

doesn't make much difference here other than semantics i guess

johnnyreilly · 2026-09-21T08:51:46Z

I thank you for the status code education though - I feel I'm forever encountering nuances!

feat: code redirects

d24badc

vercel Bot deployed to Preview – npmx.dev September 20, 2026 17:09 View deployment

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Comment thread server/middleware/canonical-redirects.global.ts Outdated

Update server/middleware/canonical-redirects.global.ts

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vercel Bot deployed to Preview – npmx.dev September 20, 2026 17:26 View deployment

feat: support explicit version redirect as well

4e5a29b

vercel Bot deployed to Preview – npmx.dev September 20, 2026 18:18 View deployment

fix: nit around 301 vs 302

3e040ca

vercel Bot deployed to Preview – npmx.dev September 20, 2026 19:50 View deployment

fix: go from 301 to 308

ab4d693

vercel Bot deployed to Preview – npmx.dev September 21, 2026 08:32 View deployment

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