diff --git a/cmd/api/api.go b/cmd/api/api.go
index 057493d42..072117d75 100644
--- a/cmd/api/api.go
+++ b/cmd/api/api.go
@@ -90,6 +90,7 @@ func NewCmdApiWithContext(ctx context.Context, f *cmdutil.Factory, runF func(*AP
 	cmd.Flags().IntVar(&opts.PageLimit, "page-limit", 10, "max pages to fetch with --page-all (0 = unlimited)")
 	cmd.Flags().IntVar(&opts.PageDelay, "page-delay", 200, "delay in ms between pages")
 	cmd.Flags().StringVar(&opts.Format, "format", "json", "output format: json|ndjson|table|csv")
+	cmd.Flags().Bool("json", false, "shorthand for --format json")
 	cmd.Flags().StringVarP(&opts.JqExpr, "jq", "q", "", "jq expression to filter JSON output")
 	cmd.Flags().BoolVar(&opts.DryRun, "dry-run", false, "print request without executing")
 	cmd.Flags().StringVar(&opts.File, "file", "", "file to upload as multipart/form-data ([field=]path, supports - for stdin)")
diff --git a/cmd/api/api_test.go b/cmd/api/api_test.go
index a966f1430..c3530c323 100644
--- a/cmd/api/api_test.go
+++ b/cmd/api/api_test.go
@@ -718,3 +718,23 @@ func TestApiCmd_PermissionError_DerivesFirstClassFields(t *testing.T) {
 		t.Errorf("LogID = %q, want %q", pe.LogID, "20260527-test-log")
 	}
 }
+
+func TestApiCmd_JsonFlag_Accepted(t *testing.T) {
+	f, _, _, _ := cmdutil.TestFactory(t, &core.CliConfig{
+		AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu,
+	})
+
+	var gotOpts *APIOptions
+	cmd := NewCmdApi(f, func(opts *APIOptions) error {
+		gotOpts = opts
+		return nil
+	})
+	cmd.SetArgs([]string{"GET", "/open-apis/test", "--json"})
+	err := cmd.Execute()
+	if err != nil {
+		t.Fatalf("--json should be accepted without error, got: %v", err)
+	}
+	if gotOpts.Method != "GET" {
+		t.Errorf("expected method GET, got %s", gotOpts.Method)
+	}
+}
diff --git a/cmd/service/service.go b/cmd/service/service.go
index 125cc584f..50a6e97b2 100644
--- a/cmd/service/service.go
+++ b/cmd/service/service.go
@@ -180,6 +180,7 @@ func NewCmdServiceMethodWithContext(ctx context.Context, f *cmdutil.Factory, spe
 	cmd.Flags().IntVar(&opts.PageLimit, "page-limit", 10, "max pages to fetch with --page-all (0 = unlimited)")
 	cmd.Flags().IntVar(&opts.PageDelay, "page-delay", 200, "delay in ms between pages")
 	cmd.Flags().StringVar(&opts.Format, "format", "json", "output format: json|ndjson|table|csv")
+	cmd.Flags().Bool("json", false, "shorthand for --format json")
 	cmd.Flags().StringVarP(&opts.JqExpr, "jq", "q", "", "jq expression to filter JSON output")
 	cmd.Flags().BoolVar(&opts.DryRun, "dry-run", false, "print request without executing")
 	if risk == "high-risk-write" {
diff --git a/cmd/service/service_test.go b/cmd/service/service_test.go
index 42377850e..172ed7f8a 100644
--- a/cmd/service/service_test.go
+++ b/cmd/service/service_test.go
@@ -765,3 +765,22 @@ func TestDetectFileFields(t *testing.T) {
 		})
 	}
 }
+
+func TestServiceMethod_JsonFlag_Accepted(t *testing.T) {
+	f, _, _, _ := cmdutil.TestFactory(t, testConfig)
+
+	var captured *ServiceMethodOptions
+	cmd := NewCmdServiceMethod(f, driveSpec(),
+		map[string]interface{}{"description": "desc", "httpMethod": "GET"}, "list", "files",
+		func(opts *ServiceMethodOptions) error {
+			captured = opts
+			return nil
+		})
+	cmd.SetArgs([]string{"--json"})
+	if err := cmd.Execute(); err != nil {
+		t.Fatalf("--json should be accepted without error, got: %v", err)
+	}
+	if captured == nil {
+		t.Fatal("expected runF to be called")
+	}
+}
diff --git a/shortcuts/common/runner.go b/shortcuts/common/runner.go
index 7b023e6e9..e091754b8 100644
--- a/shortcuts/common/runner.go
+++ b/shortcuts/common/runner.go
@@ -1176,6 +1176,9 @@ func registerShortcutFlagsWithContext(ctx context.Context, cmd *cobra.Command, f
 		cmdutil.RegisterFlagCompletion(cmd, "format", func(_ *cobra.Command, _ []string, _ string) ([]string, cobra.ShellCompDirective) {
 			return []string{"json", "pretty", "table", "ndjson", "csv"}, cobra.ShellCompDirectiveNoFileComp
 		})
+		if cmd.Flags().Lookup("json") == nil {
+			cmd.Flags().Bool("json", false, "shorthand for --format json")
+		}
 	}
 	if s.Risk == "high-risk-write" {
 		cmd.Flags().Bool("yes", false, "confirm high-risk operation")
diff --git a/shortcuts/common/runner_flag_completion_test.go b/shortcuts/common/runner_flag_completion_test.go
index 3c96dbd16..c0eaf2807 100644
--- a/shortcuts/common/runner_flag_completion_test.go
+++ b/shortcuts/common/runner_flag_completion_test.go
@@ -96,3 +96,76 @@ func TestShortcutMount_FlagCompletionsDisabled(t *testing.T) {
 		t.Fatal("did not expect completion func for --format when disabled")
 	}
 }
+
+func TestShortcutMount_JsonFlag_AcceptedWhenHasFormat(t *testing.T) {
+	f, _, _, _ := cmdutil.TestFactory(t, nil)
+	parent := &cobra.Command{Use: "root"}
+	shortcut := Shortcut{
+		Service:     "test",
+		Command:     "+read",
+		Description: "test read",
+		HasFormat:   true,
+		Execute:     func(context.Context, *RuntimeContext) error { return nil },
+	}
+	shortcut.Mount(parent, f)
+
+	cmd, _, err := parent.Find([]string{"+read"})
+	if err != nil {
+		t.Fatalf("Find() error = %v", err)
+	}
+	if flag := cmd.Flags().Lookup("json"); flag == nil {
+		t.Fatal("expected --json flag to be registered on HasFormat shortcut")
+	}
+}
+
+func TestShortcutMount_JsonFlag_SkippedWhenConflict(t *testing.T) {
+	f, _, _, _ := cmdutil.TestFactory(t, nil)
+	parent := &cobra.Command{Use: "root"}
+	shortcut := Shortcut{
+		Service:     "test",
+		Command:     "+update",
+		Description: "test update",
+		HasFormat:   true,
+		Flags: []Flag{
+			{Name: "json", Desc: "body JSON object", Required: true},
+		},
+		Execute: func(context.Context, *RuntimeContext) error { return nil },
+	}
+	shortcut.Mount(parent, f)
+
+	cmd, _, err := parent.Find([]string{"+update"})
+	if err != nil {
+		t.Fatalf("Find() error = %v", err)
+	}
+	// --json flag exists (from custom Flags), but should be the string type, not bool.
+	flag := cmd.Flags().Lookup("json")
+	if flag == nil {
+		t.Fatal("expected --json flag from custom Flags")
+	}
+	if flag.DefValue != "" {
+		t.Errorf("expected empty default (string flag), got %q", flag.DefValue)
+	}
+}
+
+func TestShortcutMount_JsonFlag_RegisteredWithoutHasFormat(t *testing.T) {
+	f, _, _, _ := cmdutil.TestFactory(t, nil)
+	parent := &cobra.Command{Use: "root"}
+	shortcut := Shortcut{
+		Service:     "test",
+		Command:     "+write",
+		Description: "test write",
+		HasFormat:   false,
+		Execute:     func(context.Context, *RuntimeContext) error { return nil },
+	}
+	shortcut.Mount(parent, f)
+
+	cmd, _, err := parent.Find([]string{"+write"})
+	if err != nil {
+		t.Fatalf("Find() error = %v", err)
+	}
+	// --format is now registered for all shortcuts (regardless of HasFormat),
+	// so --json should also be present.
+	if flag := cmd.Flags().Lookup("json"); flag == nil {
+		t.Fatal("expected --json flag to be registered even when HasFormat is false")
+	}
+}