Save response body to file when "check" fail in k6

Question

Is there any way for k6 to save every response body and response code of the failed checks/assertion?

maybe something like

check(res, {"rc code": (r) => r.status == rc_code,}) || AppendErrorLog(filename, r.body);

Answer 1

Unfortunately not, at the moment you can't open files outside of the init context, and even then they are read-only.

As a workaround, you can use console.log() to output the response body and redirect the stderr stream to a file.