Log messages are not displayed or written correctly

[MichalTuleja]

Expected behaviour

Log messages are written to the file logs/explorer.log as consecutive lines in a JSON format.

Actual behaviour

The log message output from the explorer backend process is stored in the file logs/explorer.log. Unfortunately the messages are cut in half, because the current logger is taking only two first parameters which does not allow to use full console.log() syntax.

Steps to reproduce

1. Run the backend app.
2. tail -f logs/explorer.log.
3. Compare with the logging messages from the source code.