The Nuts Node writes its logs to standard out. By default it logs in text format, but it can be configured to log in JSON format. This is especially useful when using log collection tools (e.g. fluentd) and recommended for production environments.

To enable JSON logging, set the loggerformat to json in the configuration file. Example logs message in JSON format:

  "did": "did:nuts:AmEcvjhiGxxkiByWyrN7VTapk9cXaUU8UozwWqJC7VKY",
  "level": "info",
  "module": "VDR",
  "msg": "DID document registered",
  "time": "2023-01-14T07:34:16+01:00",
  "txRef": "052a8ef99f1f641ea47cc15ca5a5c7b68028ebbf886b07898937d4303e3ea9cb"

The following fields are always available:

  • module: the module that logged the message, e.g. VDR or Auth`

  • level: the level of the log message, e.g. info or error

  • time: the timestamp of the log message, e.g. 2023-01-14T07:34:16+01:00

  • msg: the actual log message