diff --git a/src/cmd/coller/main.go b/src/cmd/coller/main.go
index bb820d2..e213740 100644
--- a/src/cmd/coller/main.go
+++ b/src/cmd/coller/main.go
@@ -61,6 +61,7 @@ func handleMain() int {
 	quiet := flag.Bool("quiet", false, "Log errors only")
 	verbose := flag.Bool("verbose", false, "Print more logs")
 	debug := flag.Bool("debug", false, "Print even more logs")
+	jsonFormat := flag.Bool("json", false, "Print logs in JSON format")
 	configFile := flag.String("config", filepath.Join(homeDir, ".config", AppName+".json"), "Configuration file")
 	reconfigure := flag.Bool("reconfigure", false, "Re-create configuration file")
 	url := flag.String("url", "", "URL of the coller API")
@@ -102,7 +103,13 @@ func handleMain() int {
 	if *quiet {
 		level = slog.LevelError
 	}
-	logger := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: level}))
+
+	var logger *slog.Logger
+	if *jsonFormat {
+		logger = slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: level}))
+	} else {
+		logger = slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: level}))
+	}
 
 	if *url == "" {
 		if _, err = os.Stat(*configFile); errors.Is(err, os.ErrNotExist) || *reconfigure {
diff --git a/src/cmd/collerd/main.go b/src/cmd/collerd/main.go
index 265fe73..2837dd4 100644
--- a/src/cmd/collerd/main.go
+++ b/src/cmd/collerd/main.go
@@ -27,6 +27,7 @@ func handleMain() int {
 	quiet := flag.Bool("quiet", false, "Log errors only")
 	verbose := flag.Bool("verbose", false, "Print more logs")
 	debug := flag.Bool("debug", false, "Print even more logs")
+	jsonFormat := flag.Bool("json", false, "Print logs in JSON format")
 	configFileName := flag.String("config", "", "Configuration file name")
 
 	flag.Parse()
@@ -46,7 +47,13 @@ func handleMain() int {
 	if *quiet {
 		level = slog.LevelError
 	}
-	logger := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: level}))
+
+	var logger *slog.Logger
+	if *jsonFormat {
+		logger = slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: level}))
+	} else {
+		logger = slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: level}))
+	}
 
 	if *configFileName != "" {
 		err = internal.ReadConfig(*configFileName, config)
diff --git a/src/cmd/copier/main.go b/src/cmd/copier/main.go
index 17dd9e5..8223d33 100644
--- a/src/cmd/copier/main.go
+++ b/src/cmd/copier/main.go
@@ -41,6 +41,7 @@ func handleMain() int {
 	quiet := flag.Bool("quiet", false, "Log errors only")
 	verbose := flag.Bool("verbose", false, "Print more logs")
 	debug := flag.Bool("debug", false, "Print even more logs")
+	jsonFormat := flag.Bool("json", false, "Print logs in JSON format")
 	encryptionKey := flag.String("encryption-key", os.Getenv("COLLER_ENCRYPTION_KEY"), "Key to decrypt the note")
 	askEncryptionKey := flag.Bool("ask-encryption-key", false, "Read encryption key from input")
 	fileName := flag.String("file", "", "Write content of the note to a file")
@@ -72,7 +73,13 @@ func handleMain() int {
 	if *quiet {
 		level = slog.LevelError
 	}
-	logger := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: level}))
+
+	var logger *slog.Logger
+	if *jsonFormat {
+		logger = slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{Level: level}))
+	} else {
+		logger = slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: level}))
+	}
 
 	if *askEncryptionKey {
 		fmt.Print("Encryption key: ")