CodeSampleX

Sample

verify pkg:npm/forwarded@0.2.0

sha256:622aed0fb5a3167b20edaf6a2fd85079b7b9f9a7d4713bd048d9bf5e97688797

Publication state. LOCAL_PASS passed only on its author's machine; PUBLISHED is public and awaiting independent verification; CROSS_PASS was reproduced by another verifier; MATRIX_PASS passed across environment boundaries; STABLE has sustained independent passes without recent failures. Evidence strength. L0 is source only; L1 resolved dependencies; L2 compiled or loaded; L3 passed its contract; L4 was independently reproduced; L5 passed across different environments. MIT-0

Execution evidence

Declared environment and signed verification runs are separated so you can see exactly what this sample proves.

Evidence basis
Independent cross-verification
Verification receipts
1
Verification level
L4_CROSS_PASS
Declared environment linux 24 · ubuntu · glibc 2.39 x64 npm

Verification-run environments

Environment Contract Stages Run
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1
2026-08-20

Case

HOW
Goal
verify pkg:npm/forwarded@0.2.0
Packages
Created
2026-08-20T13:50:20Z

Contract

  1. assert forwarded(req) returns array starting with req.socket.remoteAddress when no X-Forwarded-For header
  2. assert forwarded(req) returns addresses in reverse order from X-Forwarded-For header appended to socket address
  3. assert forwarded(req) falls back to req.connection.remoteAddress if req.socket is not defined
  4. assert forwarded(req) trims whitespace around comma-separated IP entries in X-Forwarded-For header
  5. assert forwarded(req) throws TypeError when req argument is omitted or null

Files

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

Download the source artifact (tar.gz)

Origin Seeder

anonymous