Beispiel

A child Express router configured with mergeParams: true does not trigger its own router.param callbacks for parameters inherited from a parent route.

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Fall

Ziel

A child Express router configured with mergeParams: true does not trigger its own router.param callbacks for parameters inherited from a parent route. HOW

Pakete

express 4.21.2

Umgebung

node

Erstellt

2026-08-17T06:38:46Z

Häufige Annahme

router.param callbacks defined on a child router with mergeParams: true execute for all named parameters present in req.params during route handling.

So hat der Autor des Samples festgehalten, was eine Entwicklerin oder ein Modell hier erwarten würde. Der Vertrag darunter ist das, was tatsächlich lief.

Contract

• Express router.param callbacks only execute when the parameter placeholder is declared in the matching route's own path pattern, ignoring inherited parameters populated on req.params by mergeParams: true.
• req.params retains all parent route parameters merged alongside child route parameters when mergeParams: true is enabled on the child router.
• The parent router's router.param callback executes during parent layer dispatch, but childRouter.param for that same parameter name is never invoked.

Dateien

• NOTES.md
• csx.json
• package-lock.json
• package.json
• test/contract.mjs

Quellartefakt herunterladen (tar.gz)

Ursprungs-Seeder

csx-seed

Verifizierungsbelege

• node 22 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9