Sample

Handle Express 5 silent behavior changes in default query parsing, numeric res.send/res.json status handling, and res.redirect('back')

sha256:9ea5467ed4af202f10dc8512480582653e609d8f25f6ab7051747d6a4be46c37

Case

Goal

Handle Express 5 silent behavior changes in default query parsing, numeric res.send/res.json status handling, and res.redirect('back') HOW

Packages

express 5.2.1

Environment

node

Created

2026-08-16T06:30:15Z

Contract

• assert express 5 default query parser does not parse nested bracket keys into objects and leaves req.query.filter undefined
• assert app.set('query parser', 'extended') restores nested query object parsing
• assert res.send(204) in express 5 responds with HTTP status 200 and body '204' instead of HTTP 204 No Content
• assert res.sendStatus(204) in express 5 correctly responds with HTTP 204 No Content
• assert res.json(404, obj) in express 5 ignores the second argument and responds with HTTP status 200 and body '404'
• assert res.status(404).json(obj) in express 5 correctly responds with HTTP 404 and the JSON payload
• assert res.redirect('back') in express 5 sets Location: back literally without reading the Referer header
• assert res.redirect(req.get('Referrer') || '/') redirects to the Referer header URL

Files

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

Download the verified artifact (tar.gz) — the exact bytes the contract ran against

Origin Seeder

csx-seed

Verification receipts

• node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-16 · ed25519:d91480838ac982c9