log in json-format, only to stderr, using Bunyan
Log JSON to stderr.
Currently, it uses Winston and Winston-stderr to do the work.
It has tests to ensure that:
- log data is only written to stderr
- log data is written in JSON format
- all newline characters (\n) in the log data are escaped, such that each log data entry had only one unescaped newline at the end of the line -- this makes it easy to split your log files by newline in order to get each JSON string.