diff --git a/cmd/api/handlers/v1/config.go b/cmd/api/handlers/v1/config.go
index bb9da03..7efe623 100644
--- a/cmd/api/handlers/v1/config.go
+++ b/cmd/api/handlers/v1/config.go
@@ -73,7 +73,7 @@ func LoadConfig(rulesFile, docsFile string) error {
 // @Param format query string false "Output format" Enums(json,alter_system,conf) default(json)
 // @Param show_doc query string false "Show Documentation args" Enums(true,false) default(false)
 // @Param include_pgbadger query string false "Add pgbadger configuration" Enums(true,false) default(false)
-// @Param log_format query string false "Defines the log_format to be used" Enums(stderr,csvlog,syslog) default(stderr)
+// @Param log_format query string false "Defines the log_format to be used (default: jsonlog for PG>=15, stderr otherwise)" Enums(stderr,csvlog,syslog,jsonlog)
 // @Success 200 {object} ResponseHTTP{}
 // @Router /v1/tuning/get-config [get]
 func GetConfig(c *fiber.Ctx) error {
@@ -172,6 +172,12 @@ func parseConfigArgs(c *fiber.Ctx) (*configArgs, error) {
 		return nil, fmt.Errorf("could not parse total ram: %w", err)
 	}
 
+	// Set default log format based on PostgreSQL version
+	defaultLogFormat := "stderr"
+	if float32(pgVersion) >= 15.0 {
+		defaultLogFormat = "jsonlog"
+	}
+
 	return &configArgs{
 		pgVersion:       float32(pgVersion),
 		totalRAM:        parsedRAM,
@@ -184,7 +190,7 @@ func parseConfigArgs(c *fiber.Ctx) (*configArgs, error) {
 		outFormat:       format.ExportFormat(c.Query("format", "json")),
 		showDoc:         c.Query("show_doc", "false") == "true",
 		includePgbadger: c.Query("include_pgbadger", "false") == "true",
-		logFormat:       c.Query("log_format", "stderr"),
+		logFormat:       c.Query("log_format", defaultLogFormat),
 	}, nil
 }
 
diff --git a/cmd/pgconfigctl/cmd/tune.go b/cmd/pgconfigctl/cmd/tune.go
index 36c7ae2..b3a2548 100644
--- a/cmd/pgconfigctl/cmd/tune.go
+++ b/cmd/pgconfigctl/cmd/tune.go
@@ -59,6 +59,11 @@ var tuneCmd = &cobra.Command{
 	Long:  `Uses your server info to compute the PostgreSQL tuning aiming to give you a get-start to tune your server.`,
 	Run: func(cmd *cobra.Command, args []string) {
 
+		// Auto-select jsonlog for PostgreSQL 15+ if user didn't explicitly set log format
+		if !cmd.Flags().Changed("log-format") && pgVersion >= 15.0 {
+			logFormat = "jsonlog"
+		}
+
 		out, err := rules.Compute(
 			*input.NewInput(
 				osName,
@@ -101,7 +106,7 @@ func init() {
 	tuneCmd.PersistentFlags().MarkDeprecated("env-name", "please use --profile instead")
 	tuneCmd.PersistentFlags().IntVarP(&maxConnections, "max-connections", "M", 100, "Max expected connections")
 	tuneCmd.PersistentFlags().BoolVarP(&includePgbadger, "include-pgbadger", "B", false, "Include pgbadger params?")
-	tuneCmd.PersistentFlags().StringVarP(&logFormat, "log-format", "L", "csvlog", "Default log format")
+	tuneCmd.PersistentFlags().StringVarP(&logFormat, "log-format", "L", "csvlog", "Default log format (stderr, csvlog, syslog, jsonlog)")
 
 	tuneCmd.PersistentFlags().VarP(&totalRAM, "ram", "", "Total Memory in bytes")
 	tuneCmd.PersistentFlags().Lookup("ram").DefValue = totalRAM.String()
diff --git a/pkg/category/log_config.go b/pkg/category/log_config.go
index 4c2a124..f46c5c0 100644
--- a/pkg/category/log_config.go
+++ b/pkg/category/log_config.go
@@ -45,5 +45,12 @@ var (
 				{Format: "string", Name: "log_destination", Value: "csvlog"},
 			},
 		},
+		"jsonlog": {
+			Name:        "jsonlog_config",
+			Description: "JSON Log Configuration",
+			Parameters: []ParamSliceOutput{
+				{Format: "string", Name: "log_destination", Value: "jsonlog"},
+			},
+		},
 	}
 )