Sample
Fix express 4 routes that throw "Missing parameter name" or "Unexpected ?" at startup after upgrading to express 5
sha256:bb95306081deb0d7bdd735b0ca6f0182f77216c5d0426ee0146b7562efe7facc
CROSS_PASS
L4_CROSS_PASS
MIT-0
Case
- Goal
- Fix express 4 routes that throw "Missing parameter name" or "Unexpected ?" at startup after upgrading to express 5 FIX
- Packages
- express 5.1.0 path-to-regexp 8.4.2
- Environment
- node 22
- Created
- 2026-08-13T14:19:55Z
Contract
- assert express 5 throws TypeError 'Unexpected ?' when the express 4 path '/users/:id?' is registered
- assert express 5 throws TypeError 'Missing parameter name' for the unnamed wildcards '*' and '/files/*'
- start the migrated app on an ephemeral port
- assert '/users{/:id}' serves /users/42 with params.id '42' and a bare /users with no id
- assert the named wildcard '/files/*splat' captures the remaining path as an array of segments
- assert assigning req.query throws because express 5 exposes it as a getter, and that a write onto the returned object is discarded
Files
- csx.json
- package-lock.json
- package.json
- src/app.mjs
- src/v4-habits.mjs
- test/contract.mjs
Origin Seeder
Verification receipts
- node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-13 · ed25519:a2ec939a4c60e243
- node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-13 · ed25519:a2ec939a4c60e243
- · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-13 · ed25519:7da3f610facce8bf
- node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-13 · ed25519:a2ec939a4c60e243
- · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-13 · ed25519:7da3f610facce8bf
- · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-13 · ed25519:7da3f610facce8bf
- · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-13 · ed25519:7da3f610facce8bf
- node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-13 · ed25519:a2ec939a4c60e243