diff --git a/README.md b/README.md
index 7005273..3136aec 100644
--- a/README.md
+++ b/README.md
@@ -51,6 +51,7 @@ To disable SSL and run Cosmium on HTTP instead, you can use the `-DisableTls` fl
 * **-InitialData**: Path to JSON containing initial state
 * **-Persist**: Saves data to the given path on application exit (When `-InitialData` argument is not supplied, it will try to load data from path supplied in `-Persist`)
 * **-Port**: Listen port (default 8081)
+* **-Debug**: Runs application in debug mode, this provides additional logging
 
 These arguments allow you to configure various aspects of Cosmium's behavior according to your requirements.
 
diff --git a/api/config/config.go b/api/config/config.go
index 86ebd92..55f6587 100644
--- a/api/config/config.go
+++ b/api/config/config.go
@@ -22,6 +22,7 @@ func ParseFlags() {
 	disableAuthentication := flag.Bool("DisableAuth", false, "Disable authentication")
 	disableTls := flag.Bool("DisableTls", false, "Disable TLS, serve over HTTP")
 	persistDataPath := flag.String("Persist", "", "Saves data to given path on application exit")
+	debug := flag.Bool("Debug", false, "Runs application in debug mode, this provides additional logging")
 
 	flag.Parse()
 
@@ -34,6 +35,7 @@ func ParseFlags() {
 	Config.PersistDataFilePath = *persistDataPath
 	Config.DisableAuth = *disableAuthentication
 	Config.DisableTls = *disableTls
+	Config.Debug = *debug
 
 	Config.DatabaseAccount = Config.Host
 	Config.DatabaseDomain = Config.Host
diff --git a/api/config/models.go b/api/config/models.go
index b8098e1..5bc1310 100644
--- a/api/config/models.go
+++ b/api/config/models.go
@@ -15,4 +15,5 @@ type ServerConfig struct {
 	PersistDataFilePath string
 	DisableAuth         bool
 	DisableTls          bool
+	Debug               bool
 }
diff --git a/api/handlers/middleware/authentication.go b/api/handlers/middleware/authentication.go
index 56aa4b5..48e66dd 100644
--- a/api/handlers/middleware/authentication.go
+++ b/api/handlers/middleware/authentication.go
@@ -1,13 +1,13 @@
 package middleware
 
 import (
-	"fmt"
 	"net/url"
 	"strings"
 
 	"github.com/gin-gonic/gin"
 	"github.com/pikami/cosmium/api/config"
 	"github.com/pikami/cosmium/internal/authentication"
+	"github.com/pikami/cosmium/internal/logger"
 )
 
 func Authentication() gin.HandlerFunc {
@@ -53,7 +53,7 @@ func Authentication() gin.HandlerFunc {
 		params, _ := url.ParseQuery(decoded)
 		clientSignature := strings.Replace(params.Get("sig"), " ", "+", -1)
 		if clientSignature != expectedSignature {
-			fmt.Printf("Got wrong signature from client.\n- Expected: %s\n- Got: %s\n", expectedSignature, clientSignature)
+			logger.Errorf("Got wrong signature from client.\n- Expected: %s\n- Got: %s\n", expectedSignature, clientSignature)
 			c.IndentedJSON(401, gin.H{
 				"code":    "Unauthorized",
 				"message": "Wrong signature.",
diff --git a/api/handlers/middleware/loggers.go b/api/handlers/middleware/loggers.go
index 323e4d4..45f099f 100644
--- a/api/handlers/middleware/loggers.go
+++ b/api/handlers/middleware/loggers.go
@@ -2,10 +2,10 @@ package middleware
 
 import (
 	"bytes"
-	"fmt"
 	"io"
 
 	"github.com/gin-gonic/gin"
+	"github.com/pikami/cosmium/internal/logger"
 )
 
 func RequestLogger() gin.HandlerFunc {
@@ -16,7 +16,7 @@ func RequestLogger() gin.HandlerFunc {
 
 		bodyStr := readBody(rdr1)
 		if bodyStr != "" {
-			fmt.Println(bodyStr)
+			logger.Debug(bodyStr)
 		}
 
 		c.Request.Body = rdr2
diff --git a/api/router.go b/api/router.go
index 64aa6bf..81e0ded 100644
--- a/api/router.go
+++ b/api/router.go
@@ -8,12 +8,17 @@ import (
 	"github.com/pikami/cosmium/api/config"
 	"github.com/pikami/cosmium/api/handlers"
 	"github.com/pikami/cosmium/api/handlers/middleware"
+	"github.com/pikami/cosmium/internal/logger"
+	tlsprovider "github.com/pikami/cosmium/internal/tls_provider"
 )
 
 func CreateRouter() *gin.Engine {
 	router := gin.Default()
 
-	router.Use(middleware.RequestLogger())
+	if config.Config.Debug {
+		router.Use(middleware.RequestLogger())
+	}
+
 	router.Use(middleware.Authentication())
 
 	router.GET("/dbs/:databaseId/colls/:collId/pkranges", handlers.GetPartitionKeyRanges)
@@ -49,6 +54,10 @@ func CreateRouter() *gin.Engine {
 }
 
 func StartAPI() {
+	if !config.Config.Debug {
+		gin.SetMode(gin.ReleaseMode)
+	}
+
 	router := CreateRouter()
 	listenAddress := fmt.Sprintf(":%d", config.Config.Port)
 
@@ -58,7 +67,7 @@ func StartAPI() {
 			config.Config.TLS_CertificatePath,
 			config.Config.TLS_CertificateKey)
 		if err != nil {
-			fmt.Println("Failed to start HTTPS server:", err)
+			logger.Error("Failed to start HTTPS server:", err)
 		}
 
 		return
@@ -68,17 +77,17 @@ func StartAPI() {
 		router.Run(listenAddress)
 	}
 
-	tlsConfig := config.GetDefaultTlsConfig()
+	tlsConfig := tlsprovider.GetDefaultTlsConfig()
 	server := &http.Server{
 		Addr:      listenAddress,
 		Handler:   router.Handler(),
 		TLSConfig: tlsConfig,
 	}
 
-	fmt.Printf("Listening and serving HTTPS on %s\n", server.Addr)
+	logger.Infof("Listening and serving HTTPS on %s\n", server.Addr)
 	err := server.ListenAndServeTLS("", "")
 	if err != nil {
-		fmt.Println("Failed to start HTTPS server:", err)
+		logger.Error("Failed to start HTTPS server:", err)
 	}
 
 	router.Run()
diff --git a/internal/logger/logger.go b/internal/logger/logger.go
new file mode 100644
index 0000000..01590a3
--- /dev/null
+++ b/internal/logger/logger.go
@@ -0,0 +1,40 @@
+package logger
+
+import (
+	"log"
+	"os"
+
+	"github.com/pikami/cosmium/api/config"
+)
+
+var DebugLogger = log.New(os.Stdout, "", log.Ldate|log.Ltime|log.Lshortfile)
+var InfoLogger = log.New(os.Stdout, "", log.Ldate|log.Ltime)
+var ErrorLogger = log.New(os.Stderr, "", log.Ldate|log.Ltime|log.Lshortfile)
+
+func Debug(v ...any) {
+	if config.Config.Debug {
+		DebugLogger.Println(v...)
+	}
+}
+
+func Debugf(format string, v ...any) {
+	if config.Config.Debug {
+		DebugLogger.Printf(format, v...)
+	}
+}
+
+func Info(v ...any) {
+	InfoLogger.Println(v...)
+}
+
+func Infof(format string, v ...any) {
+	InfoLogger.Printf(format, v...)
+}
+
+func Error(v ...any) {
+	ErrorLogger.Println(v...)
+}
+
+func Errorf(format string, v ...any) {
+	ErrorLogger.Printf(format, v...)
+}
diff --git a/internal/repositories/state.go b/internal/repositories/state.go
index 4b62503..4d13846 100644
--- a/internal/repositories/state.go
+++ b/internal/repositories/state.go
@@ -2,12 +2,12 @@ package repositories
 
 import (
 	"encoding/json"
-	"fmt"
 	"log"
 	"os"
 	"reflect"
 
 	"github.com/pikami/cosmium/api/config"
+	"github.com/pikami/cosmium/internal/logger"
 	repositorymodels "github.com/pikami/cosmium/internal/repository_models"
 )
 
@@ -33,7 +33,7 @@ func InitializeRepository() {
 		}
 
 		if stat.IsDir() {
-			fmt.Println("Argument '-Persist' must be a path to file, not a directory.")
+			logger.Error("Argument '-Persist' must be a path to file, not a directory.")
 			os.Exit(1)
 		}
 
@@ -55,10 +55,10 @@ func LoadStateFS(filePath string) {
 		return
 	}
 
-	fmt.Println("Loaded state:")
-	fmt.Printf("Databases: %d\n", getLength(state.Databases))
-	fmt.Printf("Collections: %d\n", getLength(state.Collections))
-	fmt.Printf("Documents: %d\n", getLength(state.Documents))
+	logger.Info("Loaded state:")
+	logger.Infof("Databases: %d\n", getLength(state.Databases))
+	logger.Infof("Collections: %d\n", getLength(state.Collections))
+	logger.Infof("Documents: %d\n", getLength(state.Documents))
 
 	storeState = state
 
@@ -68,16 +68,16 @@ func LoadStateFS(filePath string) {
 func SaveStateFS(filePath string) {
 	data, err := json.MarshalIndent(storeState, "", "\t")
 	if err != nil {
-		fmt.Printf("Failed to save state: %v\n", err)
+		logger.Errorf("Failed to save state: %v\n", err)
 		return
 	}
 
 	os.WriteFile(filePath, data, os.ModePerm)
 
-	fmt.Println("Saved state:")
-	fmt.Printf("Databases: %d\n", getLength(storeState.Databases))
-	fmt.Printf("Collections: %d\n", getLength(storeState.Collections))
-	fmt.Printf("Documents: %d\n", getLength(storeState.Documents))
+	logger.Info("Saved state:")
+	logger.Infof("Databases: %d\n", getLength(storeState.Databases))
+	logger.Infof("Collections: %d\n", getLength(storeState.Collections))
+	logger.Infof("Documents: %d\n", getLength(storeState.Documents))
 }
 
 func GetState() repositorymodels.State {
diff --git a/api/config/constants.go b/internal/tls_provider/constants.go
similarity index 90%
rename from api/config/constants.go
rename to internal/tls_provider/constants.go
index c436a78..3a37733 100644
--- a/api/config/constants.go
+++ b/internal/tls_provider/constants.go
@@ -1,9 +1,4 @@
-package config
-
-import (
-	"crypto/tls"
-	"fmt"
-)
+package tlsprovider
 
 const certificate = `
 -----BEGIN CERTIFICATE-----
@@ -64,15 +59,3 @@ ilcZlmaCS9pqIXAFK9GQ89V/xa8OibOuJUiBgShnfSQqAwQrfX1vYjtKErnjoRFs
 9+zaWugLCC47Hw6QlMDa
 -----END PRIVATE KEY-----
 `
-
-func GetDefaultTlsConfig() *tls.Config {
-	cert, err := tls.X509KeyPair([]byte(certificate), []byte(certificateKey))
-	if err != nil {
-		fmt.Println("Failed to parse certificate and key:", err)
-		return &tls.Config{}
-	}
-
-	return &tls.Config{
-		Certificates: []tls.Certificate{cert},
-	}
-}
diff --git a/internal/tls_provider/tls_provider.go b/internal/tls_provider/tls_provider.go
new file mode 100644
index 0000000..14ba666
--- /dev/null
+++ b/internal/tls_provider/tls_provider.go
@@ -0,0 +1,19 @@
+package tlsprovider
+
+import (
+	"crypto/tls"
+
+	"github.com/pikami/cosmium/internal/logger"
+)
+
+func GetDefaultTlsConfig() *tls.Config {
+	cert, err := tls.X509KeyPair([]byte(certificate), []byte(certificateKey))
+	if err != nil {
+		logger.Error("Failed to parse certificate and key:", err)
+		return &tls.Config{}
+	}
+
+	return &tls.Config{
+		Certificates: []tls.Certificate{cert},
+	}
+}
diff --git a/query_executors/memory_executor/array_functions.go b/query_executors/memory_executor/array_functions.go
index 66928fd..2973471 100644
--- a/query_executors/memory_executor/array_functions.go
+++ b/query_executors/memory_executor/array_functions.go
@@ -1,9 +1,9 @@
 package memoryexecutor
 
 import (
-	"fmt"
 	"reflect"
 
+	"github.com/pikami/cosmium/internal/logger"
 	"github.com/pikami/cosmium/parsers"
 )
 
@@ -36,13 +36,13 @@ func (c memoryExecutorContext) array_Slice(arguments []interface{}, row RowType)
 		lengthEx := c.getFieldValue(arguments[2].(parsers.SelectItem), row)
 
 		if length, ok = lengthEx.(int); !ok {
-			fmt.Println("array_Slice - got length parameters of wrong type")
+			logger.Error("array_Slice - got length parameters of wrong type")
 			return []interface{}{}
 		}
 	}
 
 	if start, ok = startEx.(int); !ok {
-		fmt.Println("array_Slice - got start parameters of wrong type")
+		logger.Error("array_Slice - got start parameters of wrong type")
 		return []interface{}{}
 	}
 
@@ -117,7 +117,7 @@ func (c memoryExecutorContext) parseArray(argument interface{}, row RowType) []i
 
 	arrValue := reflect.ValueOf(ex)
 	if arrValue.Kind() != reflect.Slice {
-		fmt.Println("parseArray got parameters of wrong type")
+		logger.Error("parseArray got parameters of wrong type")
 		return nil
 	}
 
diff --git a/query_executors/memory_executor/memory_executor.go b/query_executors/memory_executor/memory_executor.go
index b94c72b..3c90852 100644
--- a/query_executors/memory_executor/memory_executor.go
+++ b/query_executors/memory_executor/memory_executor.go
@@ -6,6 +6,7 @@ import (
 	"sort"
 	"strings"
 
+	"github.com/pikami/cosmium/internal/logger"
 	"github.com/pikami/cosmium/parsers"
 )
 
@@ -168,7 +169,7 @@ func (c memoryExecutorContext) getFieldValue(field parsers.SelectItem, row RowTy
 		var ok bool
 		if typedValue, ok = field.Value.(parsers.Constant); !ok {
 			// TODO: Handle error
-			fmt.Println("parsers.Constant has incorrect Value type")
+			logger.Error("parsers.Constant has incorrect Value type")
 		}
 
 		if typedValue.Type == parsers.ConstantTypeParameterConstant &&
@@ -186,7 +187,7 @@ func (c memoryExecutorContext) getFieldValue(field parsers.SelectItem, row RowTy
 		var ok bool
 		if typedValue, ok = field.Value.(parsers.FunctionCall); !ok {
 			// TODO: Handle error
-			fmt.Println("parsers.Constant has incorrect Value type")
+			logger.Error("parsers.Constant has incorrect Value type")
 		}
 
 		switch typedValue.Type {
@@ -288,7 +289,7 @@ func (c memoryExecutorContext) getExpressionParameterValue(
 		return c.getFieldValue(typedParameter, row)
 	}
 
-	fmt.Println("getExpressionParameterValue - got incorrect parameter type")
+	logger.Error("getExpressionParameterValue - got incorrect parameter type")
 
 	return nil
 }
diff --git a/query_executors/memory_executor/string_functions.go b/query_executors/memory_executor/string_functions.go
index 1d82b84..f34e995 100644
--- a/query_executors/memory_executor/string_functions.go
+++ b/query_executors/memory_executor/string_functions.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/pikami/cosmium/internal/logger"
 	"github.com/pikami/cosmium/parsers"
 )
 
@@ -118,7 +119,7 @@ func (c memoryExecutorContext) strings_Left(arguments []interface{}, row RowType
 	lengthEx := c.getFieldValue(arguments[1].(parsers.SelectItem), row)
 
 	if length, ok = lengthEx.(int); !ok {
-		fmt.Println("strings_Left - got parameters of wrong type")
+		logger.Error("strings_Left - got parameters of wrong type")
 		return ""
 	}
 
@@ -157,7 +158,7 @@ func (c memoryExecutorContext) strings_Replicate(arguments []interface{}, row Ro
 	timesEx := c.getFieldValue(arguments[1].(parsers.SelectItem), row)
 
 	if times, ok = timesEx.(int); !ok {
-		fmt.Println("strings_Replicate - got parameters of wrong type")
+		logger.Error("strings_Replicate - got parameters of wrong type")
 		return ""
 	}
 
@@ -190,7 +191,7 @@ func (c memoryExecutorContext) strings_Right(arguments []interface{}, row RowTyp
 	lengthEx := c.getFieldValue(arguments[1].(parsers.SelectItem), row)
 
 	if length, ok = lengthEx.(int); !ok {
-		fmt.Println("strings_Right - got parameters of wrong type")
+		logger.Error("strings_Right - got parameters of wrong type")
 		return ""
 	}
 
@@ -219,11 +220,11 @@ func (c memoryExecutorContext) strings_Substring(arguments []interface{}, row Ro
 	lengthEx := c.getFieldValue(arguments[2].(parsers.SelectItem), row)
 
 	if startPos, ok = startPosEx.(int); !ok {
-		fmt.Println("strings_Substring - got start parameters of wrong type")
+		logger.Error("strings_Substring - got start parameters of wrong type")
 		return ""
 	}
 	if length, ok = lengthEx.(int); !ok {
-		fmt.Println("strings_Substring - got length parameters of wrong type")
+		logger.Error("strings_Substring - got length parameters of wrong type")
 		return ""
 	}
 
@@ -263,7 +264,7 @@ func (c memoryExecutorContext) parseString(argument interface{}, row RowType) st
 		return str1
 	}
 
-	fmt.Println("StringEquals got parameters of wrong type")
+	logger.Error("StringEquals got parameters of wrong type")
 	return ""
 }