feat(cheatcodes): add getRecordedLogsJson cheatcode#13093
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Adds a new cheatcode `getRecordedLogsJson` that returns recorded logs
as a JSON string, similar to the existing `getStateDiffJson` pattern.
This allows users to easily post-process recorded logs externally without
needing to manually transform the Log[] array to JSON.
JSON format:
```json
[{"topics": ["0x..."], "data": "0x...", "emitter": "0x..."}]
```
Closes #12854
grandizzy
requested review from
0xrusowsky,
DaniPopes,
mattsse,
onbjerg and
zerosnacks
as code owners
zerosnacks
approved these changes
Jan 15, 2026
Contributor
|
Hey, I'm a bit confused - how can i use this on latest nightly? Do i need to wait for a release of forge-std, as it seems to not to be available yet. |
Contributor
|
Added a pr here foundry-rs/forge-std#809 as i think it's missing (on docs it is mentioned, but seems to not exist) |
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Summary
Adds a new cheatcode
getRecordedLogsJsonthat returns recorded logs as a JSON string, similar to the existinggetStateDiffJsonpattern.This allows users to easily post-process recorded logs externally without needing to manually transform the
Log[]array to JSON.Motivation
Closes #12854
Users heavily rely on log analysis for simulation and auditing purposes. Currently they have to use
recordLogs-> custom transform to JSON ->writeJson, which is cumbersome. This cheatcode provides a native way to get recorded logs as JSON for external processing.JSON Format
[ { "topics": ["0x...", "0x..."], "data": "0x...", "emitter": "0x..." } ]All binary fields are hex-encoded with
0xprefix.Changes
getRecordedLogsJson()function declaration invm.rsLogJsonstruct for JSON serializationgetStateDiffJsonTesting
testRecordedLogsJson: Verifies emitter address, topics (event signature + indexed args), and hex-encoded datatestRecordedLogsJsonEmpty: Verifies empty logs returns[]