monad-logger-json

JSON-friendly Logging APIs

http://github.com/fpco/monad-logger-json

LTS Haskell 23.27:0.1.0.0
Stackage Nightly 2025-07-08:0.1.0.0
Latest on Hackage:0.1.0.0

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MIT licensed by FP Complete Developers
Maintained by [email protected]
This version can be pinned in stack with:monad-logger-json-0.1.0.0@sha256:2c5b2668afdcb9c9abbb853b672d4743977f50a56c5c0dfc710b995bac5a0636,872

Module documentation for 0.1.0.0

Monad Logger functions for JSON

TravisCI Hackage

Install

As a library:

cabal install monad-logger-json

Usage (example)

{-# LANGUAGE TemplateHaskell #-}

import Control.Monad.IO.Class ( MonadIO(liftIO) )
import Control.Monad.Logger ( runStdoutLoggingT )
import Control.Monad.Logger.JSON ( logInfoJ, logDebugJ )
import Data.Aeson.TH ( defaultOptions, deriveJSON )
import Data.Time.Clock ( UTCTime, getCurrentTime )

data Message = Message { time :: UTCTime }

$( deriveJSON defaultOptions ''Message )

main :: IO ()
main =
  runStdoutLoggingT
    (do now <- liftIO getCurrentTime
        $logDebugJ (Message now)
        $logInfoJ "Hello world")