Sample
jason 1.4.4: Decide whether the built-in JSON module in Elixir 1.18+ can replace Jason, and migrate without breaking rescue clauses
Verified sample for hex jason 1.4.4: Decide whether the built-in JSON module in Elixir 1.18+ can replace Jason, and migrate without breaking rescue clauses.…
sha256:ea6674cc172b56536f71eb007cd144607c953026a433abcf43d85c22299b8c83
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
elixir 1 linux x64 elixir 1 elixir mix
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| elixir 1 · linux alpine/x64 · docker ed25519:a2ec939a4c60e243 | PASS | compile:PASS · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · hex@1 |
2026-08-14 |
| elixir 1 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:PASS · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · hex@1 |
2026-08-17 |
Case
MIGRATION- Goal
- Decide whether the built-in JSON module in Elixir 1.18+ can replace Jason, and migrate without breaking rescue clauses
- Packages
- Symbols
-
- JSON.encode!
- JSON.decode
- JSON.encode_to_iodata!
- Jason.decode!
- Jason.DecodeError
- JSON.DecodeError
- Environment
- elixir 1
- Created
- 2026-08-14T05:49:20Z
Contract
- assert stdlib JSON and Jason encode the same payload byte for byte
- assert the decode exception module differs, so a Jason.DecodeError rescue stops matching
- assert JSON.decode/1 returns a bare reason tuple rather than the struct Jason returns
- assert keys: :atoms has no stdlib equivalent because JSON.decode/2 does not exist
- assert pretty printing has no stdlib equivalent
- assert both stringify non-string keys and both refuse tuples
Files
- csx.json
- mix.exs
- mix.lock
- test/contract_test.exs
- test/test_helper.exs