diff --git a/cmd/decoder/main.go b/cmd/decoder/main.go
index d9d80c0..81c4d89 100644
--- a/cmd/decoder/main.go
+++ b/cmd/decoder/main.go
@@ -5,6 +5,10 @@ import (
 	"context"
 	"encoding/hex"
 	"fmt"
+	"io"
+	"log"
+	"log/slog"
+	"os"
 	"os/signal"
 	"strings"
 	"sync"
@@ -25,6 +29,16 @@ func main() {
 	appState := appcontext.NewAppState()
 	cfg := config.Load()
 
+	// Create log file
+	logFile, err := os.OpenFile("server.log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
+	if err != nil {
+		log.Fatalf("Failed to open log file: %v\n", err)
+	}
+	// shell and log file multiwriter
+	w := io.MultiWriter(os.Stderr, logFile)
+	logger := slog.New(slog.NewJSONHandler(w, nil))
+	slog.SetDefault(logger)
+
 	// define context
 	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGTERM, syscall.SIGINT)
 	defer stop()
@@ -34,7 +48,7 @@ func main() {
 
 	alertWriter := appState.AddKafkaWriter(cfg.KafkaURL, "alertbeacons")
 
-	fmt.Println("Decoder initialized, subscribed to Kafka topics")
+	slog.Info("Decoder initialized, subscribed to Kafka topics")
 
 	chRaw := make(chan model.BeaconAdvertisement, 2000)
 	chApi := make(chan model.ApiUpdate, 200)
@@ -55,18 +69,21 @@ eventloop:
 			case "POST":
 				id := msg.Beacon.ID
 				appState.AddBeaconToLookup(id)
+				lMsg := fmt.Sprintf("Beacon added to lookup: %s", id)
+				slog.Info(lMsg)
 			case "DELETE":
 				id := msg.Beacon.ID
 				appState.RemoveBeaconFromLookup(id)
-				fmt.Println("Beacon removed from lookup: ", id)
+				lMsg := fmt.Sprintf("Beacon removed from lookup: %s", id)
+				slog.Info(lMsg)
 			}
 		}
 	}
 
-	fmt.Println("broken out of the main event loop")
+	slog.Info("broken out of the main event loop")
 	wg.Wait()
 
-	fmt.Println("All go routines have stopped, Beggining to close Kafka connections")
+	slog.Info("All go routines have stopped, Beggining to close Kafka connections")
 	appState.CleanKafkaReaders()
 	appState.CleanKafkaWriters()
 }
@@ -80,7 +97,8 @@ func processIncoming(adv model.BeaconAdvertisement, appState *appcontext.AppStat
 
 	err := decodeBeacon(adv, appState, writer)
 	if err != nil {
-		fmt.Println("error in decoding")
+		eMsg := fmt.Sprintf("Error in decoding: %v", err)
+		fmt.Println(eMsg)
 		return
 	}
 }
diff --git a/cmd/location/main.go b/cmd/location/main.go
index 47cebf3..53842da 100644
--- a/cmd/location/main.go
+++ b/cmd/location/main.go
@@ -4,6 +4,10 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"io"
+	"log"
+	"log/slog"
+	"os"
 	"os/signal"
 	"sync"
 	"syscall"
@@ -24,6 +28,16 @@ func main() {
 	appState := appcontext.NewAppState()
 	cfg := config.Load()
 
+	// Create log file
+	logFile, err := os.OpenFile("server.log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
+	if err != nil {
+		log.Fatalf("Failed to open log file: %v\n", err)
+	}
+	// shell and log file multiwriter
+	w := io.MultiWriter(os.Stderr, logFile)
+	logger := slog.New(slog.NewJSONHandler(w, nil))
+	slog.SetDefault(logger)
+
 	// Define context
 	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGTERM, syscall.SIGINT)
 	defer stop()
@@ -34,7 +48,7 @@ func main() {
 
 	writer := appState.AddKafkaWriter(cfg.KafkaURL, "locevents")
 
-	fmt.Println("Locations algorithm initialized, subscribed to Kafka topics")
+	slog.Info("Locations algorithm initialized, subscribed to Kafka topics")
 
 	locTicker := time.NewTicker(1 * time.Second)
 	defer locTicker.Stop()
@@ -61,22 +75,24 @@ eventLoop:
 			switch msg.Method {
 			case "POST":
 				id := msg.Beacon.ID
-				fmt.Println("Beacon added to lookup: ", id)
+				lMsg := fmt.Sprintf("Beacon added to lookup: %s", id)
+				slog.Info(lMsg)
 				appState.AddBeaconToLookup(id)
 			case "DELETE":
 				id := msg.Beacon.ID
 				appState.RemoveBeaconFromLookup(id)
-				fmt.Println("Beacon removed from lookup: ", id)
+				lMsg := fmt.Sprintf("Beacon removed from lookup: %s", id)
+				slog.Info(lMsg)
 			}
 		case msg := <-chSettings:
 			appState.UpdateSettings(msg)
 		}
 	}
 
-	fmt.Println("broken out of the main event loop")
+	slog.Info("broken out of the main event loop")
 	wg.Wait()
 
-	fmt.Println("All go routines have stopped, Beggining to close Kafka connections")
+	slog.Info("All go routines have stopped, Beggining to close Kafka connections")
 	appState.CleanKafkaReaders()
 	appState.CleanKafkaWriters()
 }
@@ -98,7 +114,7 @@ func getLikelyLocations(appState *appcontext.AppState, writer *kafka.Writer) {
 		mSize := len(beacon.BeaconMetrics)
 
 		if (int64(time.Now().Unix()) - (beacon.BeaconMetrics[mSize-1].Timestamp)) > settings.LastSeenThreshold {
-			fmt.Println("Beacon is too old")
+			slog.Warn("beacon is too old")
 			continue
 		}
 
@@ -133,7 +149,6 @@ func getLikelyLocations(appState *appcontext.AppState, writer *kafka.Writer) {
 			beacon.LocationConfidence = 0
 
 			// Why do I need this if I am sending entire structure anyways? who knows
-			fmt.Println("this is called")
 			js, err := json.Marshal(model.LocationChange{
 				Method:           "LocationChange",
 				BeaconRef:        beacon,
@@ -144,7 +159,8 @@ func getLikelyLocations(appState *appcontext.AppState, writer *kafka.Writer) {
 			})
 
 			if err != nil {
-				fmt.Println("This error happens: ", err)
+				eMsg := fmt.Sprintf("Error in marshaling: %v", err)
+				slog.Error(eMsg)
 				beacon.PreviousConfidentLocation = bestLocName
 				beacon.PreviousLocation = bestLocName
 				appState.UpdateBeacon(beacon.ID, beacon)
@@ -166,7 +182,8 @@ func getLikelyLocations(appState *appcontext.AppState, writer *kafka.Writer) {
 
 		js, err := json.Marshal(r)
 		if err != nil {
-			fmt.Println("Error in marshaling location: ", err)
+			eMsg := fmt.Sprintf("Error in marshaling location: %v", err)
+			slog.Error(eMsg)
 			continue
 		}
 
@@ -176,7 +193,8 @@ func getLikelyLocations(appState *appcontext.AppState, writer *kafka.Writer) {
 
 		err = writer.WriteMessages(context.Background(), msg)
 		if err != nil {
-			fmt.Println("Error in sending Kafka message: ", err)
+			eMsg := fmt.Sprintf("Error in sending Kafka message: %v", err)
+			slog.Error(eMsg)
 		}
 	}
 }
@@ -194,7 +212,7 @@ func assignBeaconToList(adv model.BeaconAdvertisement, appState *appcontext.AppS
 	settings := appState.GetSettingsValue()
 
 	if settings.RSSIEnforceThreshold && (int64(adv.RSSI) < settings.RSSIMinThreshold) {
-		fmt.Println("Settings returns")
+		slog.Info("Settings returns")
 		return
 	}
 
diff --git a/cmd/server/main.go b/cmd/server/main.go
index 58199b2..c845b84 100644
--- a/cmd/server/main.go
+++ b/cmd/server/main.go
@@ -4,8 +4,11 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"io"
 	"log"
+	"log/slog"
 	"net/http"
+	"os"
 	"os/signal"
 	"strings"
 	"sync"
@@ -28,12 +31,24 @@ var upgrader = websocket.Upgrader{
 	WriteBufferSize: 1024,
 }
 
+var _ io.Writer = (*os.File)(nil)
+
 var wg sync.WaitGroup
 
 func main() {
 	cfg := config.Load()
 	appState := appcontext.NewAppState()
 
+	// Create log file
+	logFile, err := os.OpenFile("server.log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
+	if err != nil {
+		log.Fatalf("Failed to open log file: %v\n", err)
+	}
+	// shell and log file multiwriter
+	w := io.MultiWriter(os.Stderr, logFile)
+	logger := slog.New(slog.NewJSONHandler(w, nil))
+	slog.SetDefault(logger)
+
 	// define context
 	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGTERM, syscall.SIGINT)
 	defer stop()
@@ -44,12 +59,14 @@ func main() {
 
 	writer := appState.AddKafkaWriter(cfg.KafkaURL, "apibeacons")
 	settingsWriter := appState.AddKafkaWriter(cfg.KafkaURL, "settings")
+	slog.Info("Kafka writers topics: apibeacons, settings initialized")
 
 	locationReader := appState.AddKafkaReader(cfg.KafkaURL, "locevents", "gid-loc-server")
 	alertsReader := appState.AddKafkaReader(cfg.KafkaURL, "alertbeacons", "gid-alert-serv")
+	slog.Info("Kafka readers topics: locevents, alertbeacons initialized")
 
 	client := appState.AddValkeyClient(cfg.ValkeyURL)
-	fmt.Println("Init of kafka writers and readers done")
+	slog.Info("Valkey DB client created")
 
 	chLoc := make(chan model.HTTPLocation, 200)
 	chEvents := make(chan model.BeaconEvent, 500)
@@ -60,9 +77,6 @@ func main() {
 
 	r := mux.NewRouter()
 
-	fmt.Println("new print")
-	fmt.Println("new print")
-	// For now just add beacon DELETE / GET / POST / PUT methods
 	r.HandleFunc("/api/beacons/{beacon_id}", controller.BeaconsDeleteController(writer, ctx, appState)).Methods("DELETE")
 	r.HandleFunc("/api/beacons", controller.BeaconsListController(appState)).Methods("GET")
 	r.HandleFunc("/api/beacons/{beacon_id}", controller.BeaconsListSingleController(appState)).Methods("GET")
@@ -97,27 +111,35 @@ eventLoop:
 			break eventLoop
 		case msg := <-chLoc:
 			if err := service.LocationToBeaconService(msg, appState, client, ctx); err != nil {
-				fmt.Printf("Error in writing location change to beacon: %v\n", err)
+				eMsg := fmt.Sprintf("Error in writing location change to beacon: %v\n", err)
+				slog.Error(eMsg)
 			}
 		case msg := <-chEvents:
 			if err := service.EventToBeaconService(msg, appState, client, ctx); err != nil {
-				fmt.Printf("Error in writing event change to beacon: %v\n", err)
+				eMsg := fmt.Sprintf("Error in writing event change to beacon: %v\n", err)
+				slog.Error(eMsg)
 			}
 		}
 	}
 
 	if err := server.Shutdown(context.Background()); err != nil {
-		fmt.Printf("could not shutdown: %v\n", err)
+		eMsg := fmt.Sprintf("could not shutdown: %v\n", err)
+		slog.Error(eMsg)
 	}
 
-	fmt.Println("broken out of the main event loop and HTTP server shutdown")
+	slog.Info("API SERVER: \n")
+	slog.Warn("broken out of the main event loop and HTTP server shutdown\n")
 	wg.Wait()
 
-	fmt.Println("All go routines have stopped, Beggining to close Kafka connections")
+	slog.Info("All go routines have stopped, Beggining to close Kafka connections\n")
 	appState.CleanKafkaReaders()
 	appState.CleanKafkaWriters()
-	fmt.Println("All kafka clients shutdown, starting shutdown of valkey client")
+
+	slog.Info("All kafka clients shutdown, starting shutdown of valkey client")
 	appState.CleanValkeyClient()
+
+	slog.Info("API server shutting down")
+	logFile.Close()
 }
 
 func serveWs(appstate *appcontext.AppState, ctx context.Context) http.HandlerFunc {
@@ -125,7 +147,8 @@ func serveWs(appstate *appcontext.AppState, ctx context.Context) http.HandlerFun
 		ws, err := upgrader.Upgrade(w, r, nil)
 		if err != nil {
 			if _, ok := err.(websocket.HandshakeError); !ok {
-				log.Println(err)
+				eMsg := fmt.Sprintf("could not upgrade ws connection: %v\n", err)
+				slog.Error(eMsg)
 			}
 			return
 		}
@@ -147,7 +170,7 @@ func writer(ws *websocket.Conn, appstate *appcontext.AppState, ctx context.Conte
 	for {
 		select {
 		case <-ctx.Done():
-			log.Println("WebSocket writer received shutdown signal.")
+			slog.Info("WebSocket writer received shutdown signal.")
 			ws.SetWriteDeadline(time.Now().Add(10 * time.Second))
 			ws.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""))
 			return
@@ -180,10 +203,9 @@ func reader(ws *websocket.Conn, ctx context.Context) {
 	ws.SetReadDeadline(time.Now().Add((60 * 9) / 10 * time.Second))
 	ws.SetPongHandler(func(string) error { ws.SetReadDeadline(time.Now().Add((60 * 9) / 10 * time.Second)); return nil })
 	for {
-		fmt.Println("this is called")
 		select {
 		case <-ctx.Done():
-			fmt.Println("closing websocket reader")
+			slog.Info("closing ws reader")
 			return
 		default:
 			_, _, err := ws.ReadMessage()
diff --git a/internal/pkg/model/typeMethods.go b/internal/pkg/model/type_methods.go
similarity index 100%
rename from internal/pkg/model/typeMethods.go
rename to internal/pkg/model/type_methods.go