package easy_logging_yojson

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Configuration loader for easy_logging with yojson backend


Dune Dependency





Logging module for OCaml.

Quick start :

open Easy_logging
logger = Logging.make_logger "my_logger" Debug [Cli Debug];;
logger#info "log_message";;

See documentation at


Version 0.8.2

  • fix license in source code files (Mozilla Public License Version 2.0)

Version 0.8.1

  • General cleanup

  • Some refactoring (removed MakeLogging functor)

  • Relax ppx_deriving dependency requirements.

  • Switch to Mozilla Public License 2.0

  • Minimal version of OCaml is not 4.07

Version 0.7

  • added tree_to_yojson function

  • added level_of_string to Logging

  • logger level is no more option type (NoLevel takes the role of None)

  • fix json formatter

Version 0.6

  • Added more options to file handlers (automatic timestamps and/or versioning of file names)

  • Added CliErr handler to output to stderr

  • modified handlers type so that fully custom handlers can be instantiated

  • cleaned module API

  • log items contains a timestamp

Version 0.6.2
  • Added RotatingFile handlers : log file rotation based on file size

Version 0.5

  • Renamed the Default_handlers module to handlers

  • tag type in Handlers is now string (was unit)

  • added the possibility to add filters to handlers

  • added tag_generator feature to loggers, to automatically add tags to all messages passed to a logger

version 0.5.1
  • log_level type is direcly accessible from Easy_logging and Easy_logging_yojson modules

version 0.5.2
  • more file_handler options (timestamp, versioning)

Version 0.4

  • printf style logging is now the default

  • simplifed configuration in case of multiple loggers (and closer to the python module) : the loggers form a tree (based on their name, dots indicating descendence)

    • log items are passed to the handlers of a logger’s ancestors (so that few handlers need initialisation) (possible to override)

    • loggers inherit the level of their ancestor if not set explicitely

  • an additional package easy_logging_yojson provides initialisation of loggers from the json format (with ppx_deriving_yojson), so that configuration can be fully done outside the code.


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