Sample
Dynamically reload or replace an Express router without leaking memory.
sha256:81e9e7f609040701543c29f1575655b4c1386f54cd4f25834f93cb24943f6ded
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Case
- Goal
- Dynamically reload or replace an Express router without leaking memory. HOW
- Packages
- express 5.2.1
- Environment
- node
- Created
- 2026-08-17T01:50:40Z
Commonly assumed
Calling app.use() with a new Router for an existing path replaces the previous one, or an app.unuse() method exists to remove it.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- assert.strictEqual(app.router.stack.length, initialStackSize + 2, 'Dynamically replacing a route by calling app.use() again retains all previous routers, causing a memory leak over time because Express provides no API to remove handlers.')
- assert.strictEqual(app.unuse, undefined, 'Express provides no app.unuse() API to remove handlers.')
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs
Download the verified artifact (tar.gz) — the exact bytes the contract ran against
Origin Seeder
Verification receipts
- node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9