diff --git a/cmd/slash/main.go b/cmd/slash/main.go
index 6a117c7..69af11e 100644
--- a/cmd/slash/main.go
+++ b/cmd/slash/main.go
@@ -8,14 +8,15 @@ import (
 	"os/signal"
 	"syscall"
 
-	"github.com/spf13/cobra"
-	"github.com/spf13/viper"
-	_ "modernc.org/sqlite"
-
+	"github.com/boojack/slash/internal/log"
 	"github.com/boojack/slash/server"
 	_profile "github.com/boojack/slash/server/profile"
 	"github.com/boojack/slash/store"
 	"github.com/boojack/slash/store/db"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+	"go.uber.org/zap"
+	_ "modernc.org/sqlite"
 )
 
 const (
@@ -36,7 +37,7 @@ var (
 			db := db.NewDB(profile)
 			if err := db.Open(ctx); err != nil {
 				cancel()
-				fmt.Printf("failed to open db, error: %+v\n", err)
+				log.Error("failed to open database", zap.Error(err))
 				return
 			}
 
@@ -44,7 +45,7 @@ var (
 			s, err := server.NewServer(ctx, profile, storeInstance)
 			if err != nil {
 				cancel()
-				fmt.Printf("failed to create server, error: %+v\n", err)
+				log.Error("failed to create server", zap.Error(err))
 				return
 			}
 
@@ -55,16 +56,16 @@ var (
 			signal.Notify(c, os.Interrupt, syscall.SIGTERM)
 			go func() {
 				sig := <-c
-				fmt.Printf("%s received.\n", sig.String())
+				log.Info(fmt.Sprintf("%s received.\n", sig.String()))
 				s.Shutdown(ctx)
 				cancel()
 			}()
 
-			println(greetingBanner)
-			fmt.Printf("Version %s has started at :%d\n", profile.Version, profile.Port)
+			printGreetings()
+
 			if err := s.Start(ctx); err != nil {
 				if err != http.ErrServerClosed {
-					fmt.Printf("failed to start server, error: %+v\n", err)
+					log.Error("failed to start server", zap.Error(err))
 					cancel()
 				}
 			}
@@ -76,6 +77,7 @@ var (
 )
 
 func Execute() error {
+	defer log.Sync()
 	return rootCmd.Execute()
 }
 
@@ -109,7 +111,7 @@ func initConfig() {
 	var err error
 	profile, err = _profile.GetProfile()
 	if err != nil {
-		fmt.Printf("failed to get profile, error: %+v\n", err)
+		log.Error("failed to get profile", zap.Error(err))
 		return
 	}
 
@@ -122,6 +124,15 @@ func initConfig() {
 	println("---")
 }
 
+func printGreetings() {
+	fmt.Println(greetingBanner)
+	fmt.Printf("Version %s has been started on port %d\n", profile.Version, profile.Port)
+	fmt.Println("---")
+	fmt.Println("See more in:")
+	fmt.Printf("👉GitHub: %s\n", "https://github.com/boojack/slash")
+	fmt.Println("---")
+}
+
 func main() {
 	err := Execute()
 	if err != nil {
diff --git a/go.mod b/go.mod
index 8b7e582..9972139 100644
--- a/go.mod
+++ b/go.mod
@@ -50,6 +50,8 @@ require (
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/subosito/gotenv v1.4.2 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	go.uber.org/multierr v1.8.0 // indirect
 	golang.org/x/tools v0.6.0 // indirect
 	golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect
 	google.golang.org/genproto v0.0.0-20230706204954-ccb25ca9f130 // indirect
@@ -74,6 +76,7 @@ require (
 	github.com/mssola/useragent v1.0.0
 	github.com/pkg/errors v0.9.1
 	go.deanishe.net/favicon v0.1.0
+	go.uber.org/zap v1.21.0
 	golang.org/x/exp v0.0.0-20230626212559-97b1e661b5df
 	golang.org/x/mod v0.11.0
 	google.golang.org/genproto/googleapis/api v0.0.0-20230726155614-23370e0ffb3e
diff --git a/go.sum b/go.sum
index dcc43c4..bba99d8 100644
--- a/go.sum
+++ b/go.sum
@@ -44,6 +44,8 @@ github.com/andybalholm/cascadia v1.1.0 h1:BuuO6sSfQNFRu1LppgbD25Hr2vLYW25JvxHs5z
 github.com/andybalholm/cascadia v1.1.0/go.mod h1:GsXiBklL0woXo1j/WYWtSYYC4ouU9PqHO0sqidkEA4Y=
 github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
 github.com/aws/aws-sdk-go v1.34.28/go.mod h1:H7NKnBqNVzoTJpGfLrQkkD+ytBA93eiDYi/+8rV9s48=
+github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=
+github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
@@ -292,6 +294,7 @@ github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9de
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
+github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 go.deanishe.net/favicon v0.1.0 h1:Afy941gjRik+DjUUcYHUxcztFEeFse2ITBkMMOlgefM=
 go.deanishe.net/favicon v0.1.0/go.mod h1:vIKVI+lUh8k3UAzaN4gjC+cpyatLQWmx0hVX4vLE8jU=
 go.mongodb.org/mongo-driver v1.4.2/go.mod h1:WcMNYLx/IlOxLe6JRJiv2uXuCz6zBLndR4SoGjYphSc=
@@ -301,6 +304,16 @@ go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.5/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk=
+go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
+go.uber.org/atomic v1.9.0 h1:ECmE8Bn/WFTYwEW/bpKD3M8VtR/zQVbavAoalC1PYyE=
+go.uber.org/atomic v1.9.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
+go.uber.org/goleak v1.1.11 h1:wy28qYRKZgnJTxGxvye5/wgWr1EKjmUDGYox5mGlRlI=
+go.uber.org/goleak v1.1.11/go.mod h1:cwTWslyiVhfpKIDGSZEM2HlOvcqm+tG4zioyIeLoqMQ=
+go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU=
+go.uber.org/multierr v1.8.0 h1:dg6GjLku4EH+249NNmoIciG9N/jURbDG+pFlTkhzIC8=
+go.uber.org/multierr v1.8.0/go.mod h1:7EAYxJLBy9rStEaz58O2t4Uvip6FSURkq8/ppBp95ak=
+go.uber.org/zap v1.21.0 h1:WefMeulhovoZ2sYXz7st6K0sLj7bBhpiFaud4r4zST8=
+go.uber.org/zap v1.21.0/go.mod h1:wjWOCqI0f2ZZrJF/UufIOkiC8ii6tm1iqIsLo76RfJw=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190422162423-af44ce270edf/go.mod h1:WFFai1msRO1wXaEeE5yQxYXgSfI8pQAWXbQop6sCtWE=
@@ -348,6 +361,7 @@ golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.1/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.11.0 h1:bUO06HqtnRcc/7l71XBe4WcqTZ+3AH1J59zWDDwLKgU=
 golang.org/x/mod v0.11.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/net v0.0.0-20180218175443-cbe0f9307d01/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -382,6 +396,7 @@ golang.org/x/net v0.0.0-20201031054903-ff519b6c9102/go.mod h1:sp8m0HH+o8qH0wwXwY
 golang.org/x/net v0.0.0-20201209123823-ac852fbbde11/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20201224014010-6772e930b67b/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/net v0.12.0 h1:cfawfvKITfUsFCeJIHJrbSxpeu/E81khclypR0GVT50=
 golang.org/x/net v0.12.0/go.mod h1:zEVYFnQC7m/vmpQFELhcD1EWkZlX69l4oqgmer6hfKA=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
@@ -404,6 +419,7 @@ golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.1.0 h1:wsuoTGHzEhffawBOhz5CYhcrV4IdKZbEyZjBMuTp12o=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -442,7 +458,9 @@ golang.org/x/sys v0.0.0-20201201145000-ef89a241ccb3/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210104204734-6f8348627aad/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210225134936-a50acf3fe073/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423185535-09eb48e85fd7/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
@@ -517,6 +535,7 @@ golang.org/x/tools v0.0.0-20201208233053-a543418bbed2/go.mod h1:emZCQorbCU4vsT4f
 golang.org/x/tools v0.0.0-20210105154028-b0ab187a4818/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.0.0-20210108195828-e2f9c7f1fc8e/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.1.0/go.mod h1:xkSsbof2nBLbhDlRMhhhyNLN/zl3eTqcnHD5viDpcZ0=
+golang.org/x/tools v0.1.5/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.6.0 h1:BOw41kyTf3PuCW1pVQf8+Cyg8pMlkYB1oo9iJ6D/lKM=
 golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
@@ -632,6 +651,7 @@ gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/ini.v1 v1.67.0 h1:Dgnx+6+nfE+IfzjUEISNeydPJh9AXNNsWbGP9KzCsOA=
 gopkg.in/ini.v1 v1.67.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/internal/errorutil/errorutil.go b/internal/errorutil/errorutil.go
deleted file mode 100644
index 9883892..0000000
--- a/internal/errorutil/errorutil.go
+++ /dev/null
@@ -1,72 +0,0 @@
-package errorutil
-
-import (
-	"errors"
-)
-
-// Code is the error code.
-type Code int
-
-// Application error codes.
-const (
-	// 0 ~ 99 general error.
-	Ok             Code = 0
-	Internal       Code = 1
-	NotAuthorized  Code = 2
-	Invalid        Code = 3
-	NotFound       Code = 4
-	Conflict       Code = 5
-	NotImplemented Code = 6
-)
-
-// Error represents an application-specific error. Application errors can be
-// unwrapped by the caller to extract out the code & message.
-//
-// Any non-application error (such as a disk error) should be reported as an
-// Internal error and the human user should only see "Internal error" as the
-// message. These low-level internal error details should only be logged and
-// reported to the operator of the application (not the end user).
-type Error struct {
-	// Machine-readable error code.
-	Code Code
-
-	// Embedded error.
-	Err error
-}
-
-// Error implements the error interface. Not used by the application otherwise.
-func (e *Error) Error() string {
-	return e.Err.Error()
-}
-
-// ErrorCode unwraps an application error and returns its code.
-// Non-application errors always return EINTERNAL.
-func ErrorCode(err error) Code {
-	var e *Error
-	if err == nil {
-		return Ok
-	} else if errors.As(err, &e) {
-		return e.Code
-	}
-	return Internal
-}
-
-// ErrorMessage unwraps an application error and returns its message.
-// Non-application errors always return "Internal error".
-func ErrorMessage(err error) string {
-	var e *Error
-	if err == nil {
-		return ""
-	} else if errors.As(err, &e) {
-		return e.Err.Error()
-	}
-	return "Internal error."
-}
-
-// Errorf is a helper function to return an Error with a given code and error.
-func Errorf(code Code, err error) *Error {
-	return &Error{
-		Code: code,
-		Err:  err,
-	}
-}
diff --git a/internal/log/logger.go b/internal/log/logger.go
new file mode 100644
index 0000000..c839521
--- /dev/null
+++ b/internal/log/logger.go
@@ -0,0 +1,66 @@
+package log
+
+import (
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+var (
+	// `gl` is the global logger.
+	// Other packages should use public methods such as Info/Error to do the logging.
+	// For other types of logging, e.g. logging to a separate file, they should use their own loggers.
+	gl     *zap.Logger
+	gLevel zap.AtomicLevel
+)
+
+// Initializes the global console logger.
+func init() {
+	gLevel = zap.NewAtomicLevelAt(zap.InfoLevel)
+	gl, _ = zap.Config{
+		Level:       gLevel,
+		Development: true,
+		// Use "console" to print readable stacktrace.
+		Encoding:         "console",
+		EncoderConfig:    zap.NewDevelopmentEncoderConfig(),
+		OutputPaths:      []string{"stderr"},
+		ErrorOutputPaths: []string{"stderr"},
+	}.Build(
+		// Skip one caller stack to locate the correct caller.
+		zap.AddCallerSkip(1),
+	)
+}
+
+// SetLevel wraps the zap Level's SetLevel method.
+func SetLevel(level zapcore.Level) {
+	gLevel.SetLevel(level)
+}
+
+// EnabledLevel wraps the zap Level's Enabled method.
+func EnabledLevel(level zapcore.Level) bool {
+	return gLevel.Enabled(level)
+}
+
+// Debug wraps the zap Logger's Debug method.
+func Debug(msg string, fields ...zap.Field) {
+	gl.Debug(msg, fields...)
+}
+
+// Info wraps the zap Logger's Info method.
+func Info(msg string, fields ...zap.Field) {
+	gl.Info(msg, fields...)
+}
+
+// Warn wraps the zap Logger's Warn method.
+func Warn(msg string, fields ...zap.Field) {
+	gl.Warn(msg, fields...)
+}
+
+// Error wraps the zap Logger's Error method.
+func Error(msg string, fields ...zap.Field) {
+	gl.Error(msg, fields...)
+}
+
+// Sync wraps the zap Logger's Sync method.
+func Sync() {
+	_ = gl.Sync()
+}