5.0.0

Express v5.0.0

🎉 Express v5 is finally here! 🎉

After years of development, the long-awaited Express v5 has been officially released. This version focuses on simplifying the codebase, improving security, and dropping support for older Node.js versions to enable better performance and maintainability.

For detailed information, please check out the official Express v5 release blog post.

Most relevant details

Major Changes in v5

• Node.js version support: Dropped support for Node.js versions before v18.
• Routing changes: Updated to path-to-regexp@8.x, removing sub-expression regex patterns for security reasons (ReDoS mitigation).
• Promise support: Middleware can now return rejected promises, caught by the router as errors.
• body-parser changes: Several improvements including the ability to customize urlencoded body depth and defaulting extended to false.
• Deprecated API methods removed: Removed old, deprecated API method signatures from Express v3/v4.

For a complete list of breaking changes and API deprecations, see the migration guide.

Security Updates

This release includes important security fixes, including improvements to prevent ReDoS attacks and mitigation for CVE-2024-45590. Full details can be found in the security release notes.

Migration

Be sure to check out our migration guide for instructions on how to update your applications from Express v4 to v5.

Security Guidance

For best practices, we recommend reviewing the Threat Model which outlines Express' approach to securing your applications, including tips for user input validation and other critical aspects.

What's Changed

• 4.19.2 Staging by @wesleytodd in #5561
• remove duplicate location test for data uri by @wesleytodd in #5562
• feat: document beta releases expectations by @marco-ippolito in #5565
• Cut down on duplicated CI runs by @jonchurch in #5564
• Add a Threat Model by @UlisesGascon in #5526
• Assign captain of encodeurl by @blakeembrey in #5579
• Nominate jonchurch as repo captain for http-errors, expressjs.com, morgan, cors, body-parser by @jonchurch in #5587
• docs: update Security.md by @inigomarquinez in #5590
• docs: update triage nomination policy by @UlisesGascon in #5600
• Add CodeQL (SAST) by @UlisesGascon in #5433
• docs: add UlisesGascon as triage initiative captain by @UlisesGascon in #5605
• Use object with null prototype for various app properties by @EvanHahn in #4861
• deps: encodeurl@~2.0.0 by @blakeembrey in #5569
• skip QUERY method test by @jonchurch in #5628
• ignore ETAG query test on 21 and 22, reuse skip util by @jonchurch in #5639
• add support Node.js@22 in the CI by @mertcanaltin in #5627
• doc: add table of contents, tc/triager lists to readme by @mertcanaltin in #5619
• List and sort all projects, add captains by @blakeembrey in #5653
• Call callback once on listen error by @wesleytodd in #3216
• docs: add @UlisesGascon as captain for cookie-parser by @UlisesGascon in #5666
• ✨ bring back query tests for node 21 by @ctcpip in #5690
• [v4] Deprecate res.clearCookie accepting options.maxAge and options.expires by @jonchurch in #5672
• skip QUERY tests for Node 21 only, still not supported by @jonchurch in #5695
• 📝 update people, add ctcpip to TC by @ctcpip in #5683
• remove minor version pinning from ci by @jonchurch in #5722
• Fix link variable use in attribution section of CODE OF CONDUCT by @IamLizu in #5762
• Replace Appveyor windows testing with GHA by @jonchurch in #5599
• Add OSSF Scorecard badge by @UlisesGascon in #5436
• Throw on invalid status codes by @jonchurch in #4212
• Use Array.flat instead of array-flatten by @almic in #5677
• Adopt Node@18 as the minimum supported version by @UlisesGascon in #5803
• Ignore expires and maxAge in res.clearCookie() by @jonchurch in #5792
• send@1.0.0 by @wesleytodd in #5786
• chore: upgrade debug dep from 3.10 to 4.3.6 by @carpasse in #5829
• refactor: replace 'path-is-absolute' dep with node:path isAbsolute method by @carpasse in #5830
• update scorecard link by @bjohansebas in #5814
• Nominate @IamLizu to the triage team by @UlisesGascon in #5836
• deps: path-to-regexp@0.1.8 by @blakeembrey in #5603
• docs: specify new instructions for question and discuss by @IamLizu in #5835
• 5.x: Upgrading merge-descriptors with allowing minors by @RobinTail in #5782
• 4.x: Upgrade merge-descriptors dependency by @RobinTail in #5781
• WIP: serve-static@2 by @wesleytodd in #5790
• chore: upgrade qs dp from 6.11.0 to 6.13.0 by @carpasse in #5847
• Upgrade cookie signature by @IamLizu in #5833
• accepts@2 by @wesleytodd in #5881
• mime-types@3 by @wesleytodd in #5882
• type-is@^2.0.0 by @wesleytodd in #5883
• content-disposition@^1.0.0 by @wesleytodd in #5884
• fix(deps): finalhandler@^2.0.0 by @wesleytodd in #5899
• path-to-regexp@0.1.10 by @blakeembrey in #5902
• update to fresh@^2.0.0 by @jonchurch in #5916
• router@^2.0.0 by @wesleytodd in #5885
• Adopt Node@18 as the minimum supported version by @UlisesGascon in #5595
• master -> 5.0 by @ctcpip in #5785
• 🔧 update CI, remove unsupported versions, clean up by @ctcpip in #5931
• Delete back as a magic string by @blakeembrey in #5933
• Release 5.0 by @dougwilson in #2237

New Contributors

• @marco-ippolito made their first contribution in #5565
• @inigomarquinez made their first contribution in #5590
• @mertcanaltin made their first contribution in #5627
• @ctcpip made their first contribution in #5690
• @IamLizu made their first contribution in #5762
• @almic made their first contribution in #5677
• @carpasse made their first contribution in #5829
• @bjohansebas made their first contribution in #5814
• @RobinTail made their first contribution in #5782

Full Changelog: v5.0.0-beta.3...v5.0.0