Sample
express 5.1.0: Serve JSON with Express 5 on Bun, including a route parameter, a JSON body, a thrown handler and a 404
Verified sample for npm express 5.1.0: Serve JSON with Express 5 on Bun, including a route parameter, a JSON body, a thrown handler and a 404. The contract…
sha256:a8e62ab5d4dc56bacf8aec6e1a92fda9c7490eb0de3a5966c6e9932eb27a8cbb
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
bun 1 linux · musl x64 bun 1 javascript bun
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| bun 1 · linux alpine/x64 · docker ed25519:a2ec939a4c60e243 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · npm@1 |
2026-08-14 |
| bun 1 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · npm@1 |
2026-08-17 |
Case
HOW- Goal
- Serve JSON with Express 5 on Bun, including a route parameter, a JSON body, a thrown handler and a 404
- Packages
- Symbols
-
- express
- express.json
- Application.listen
- Environment
- bun 1
- Created
- 2026-08-14T06:31:55Z
Contract
- serve a route parameter and a query string as JSON
- parse a JSON body and answer 201
- assert a handler that throws becomes a 500 rather than killing the process
- assert an unmatched path is Express's own 404
- assert the server is bound to loopback, since the stage has no network
Files
- bun.lock
- csx.json
- package.json
- src/app.mjs
- test/contract.mjs