zap_test.go

package main

import (
    "go.uber.org/zap"
    "encoding/json"
)

func main() {
    cfg := zap.NewProductionConfig()

    cfg.Encoding = "json"
    cfg.OutputPaths = []string{
        "/tmp/logs",
    }

    rawJSON := []byte(`{
      "level": "debug",
      "encoding": "json",
      "outputPaths": ["stdout", "/tmp/logs"],
      "errorOutputPaths": ["stderr"],
      "initialFields": {"foo": "bar"},
      "encoderConfig": {
        "messageKey": "message",
        "levelKey": "level",
        "levelEncoder": "lowercase"
      }
    }`)

    if err := json.Unmarshal(rawJSON, &cfg); err != nil {
        panic(err)
    }

    logger, err := cfg.Build()
    if err != nil {
        panic(err)
    }

    defer logger.Sync()

    logger.Info("logger construction succeeded")
}