In SPM-3895 we've introduced additional 'attr' parameter to log printing and assertion functions that can take structured data and print it as valid JSON (without quote escaping and without NumberLong(1), etc.) Such JSON can be easily processed further with JSON tools such as jq or even VSCode.

We can use this new parameter to improve jstestsfuzz output, especially for queries and plans that come too often into the logs on jstestfuzz errors. We need to look for some printing / logging / asserting in jstestfuzz framework

print("Expected plan: " + tojson(queryPlan1) + "\n Actual plan:" + tojson(queryPlan2));

and replace those with structured output (JSON), e.g.:

jsTest.log.info("expected vs. actual query plans", {expected: queryPlan1, actual: queryPlan2});