diff --git a/swissmap/options.go b/swissmap/options.go
index c88cada..2e2e76b 100644
--- a/swissmap/options.go
+++ b/swissmap/options.go
@@ -16,3 +16,14 @@ func WithThreadSafety[K, V comparable]() Option[K, V] {
 		m.threadSafe = true
 	}
 }
+
+// WithSortMapKeys enables sorting of map keys
+func WithSortMapKeys[K, V comparable]() Option[K, V] {
+	cfg := getDefaultSonicConfig()
+	cfg.SortMapKeys = true
+
+	return func(m *Map[K, V]) {
+		m.sorted = true
+		m.api = cfg.Froze()
+	}
+}
diff --git a/swissmap/swissmap.go b/swissmap/swissmap.go
index ad3b16a..29efe18 100644
--- a/swissmap/swissmap.go
+++ b/swissmap/swissmap.go
@@ -7,16 +7,21 @@ import (
 	"github.com/cockroachdb/swiss"
 )
 
-// Map is a generic map implementation using swiss.Map with optional thread-safety
+// Map is a generic map implementation using swiss.Map with additional [Option]s
 type Map[K, V comparable] struct {
+	api        sonic.API
+	data       *swiss.Map[K, V]
 	mutex      sync.RWMutex
 	threadSafe bool
-	data       *swiss.Map[K, V]
+	sorted     bool
 }
 
 // New creates a new Map with the given options
 func New[K, V comparable](options ...Option[K, V]) *Map[K, V] {
-	m := &Map[K, V]{data: swiss.New[K, V](0)}
+	m := &Map[K, V]{
+		data: swiss.New[K, V](0),
+		api:  getDefaultSonicConfig().Froze(),
+	}
 
 	for _, opt := range options {
 		opt(m)
@@ -108,6 +113,17 @@ func (m *Map[K, V]) GetOrDefault(key K, defaultValue V) V {
 	return defaultValue
 }
 
+// GetByIndex retrieves a value by its index
+//
+// The index is 0-based and must be less than the number of elements in the map
+func (m *Map[K, V]) GetByIndex(idx int) (V, bool) {
+	// TODO(dwisiswant0): Implement this method
+
+	var value V
+
+	return value, false
+}
+
 // Has checks if a key exists in the map
 func (m *Map[K, V]) Has(key K) bool {
 	m.rLock()
@@ -128,11 +144,8 @@ func (m *Map[K, V]) IsEmpty() bool {
 
 // Merge adds all key/value pairs from the input map
 func (m *Map[K, V]) Merge(n map[K]V) {
-	m.lock()
-	defer m.unlock()
-
 	for k, v := range n {
-		m.data.Put(k, v)
+		m.Set(k, v)
 	}
 }
 
@@ -157,17 +170,19 @@ func (m *Map[K, V]) MarshalJSON() ([]byte, error) {
 		return true
 	})
 
-	return sonic.Marshal(target)
+	return m.api.Marshal(target)
 }
 
 // UnmarshalJSON unmarshals the map from JSON
+//
+// The map is merged with the input data.
 func (m *Map[K, V]) UnmarshalJSON(buf []byte) error {
 	m.lock()
 	defer m.unlock()
 
 	target := make(map[K]V)
 
-	if err := sonic.Unmarshal(buf, &target); err != nil {
+	if err := m.api.Unmarshal(buf, &target); err != nil {
 		return err
 	}
 
diff --git a/swissmap/swissmap_test.go b/swissmap/swissmap_test.go
index 4ecb622..1885b94 100644
--- a/swissmap/swissmap_test.go
+++ b/swissmap/swissmap_test.go
@@ -160,6 +160,46 @@ func TestMapJSON(t *testing.T) {
 		}
 	})
 
+	t.Run("WithSortMapKeys", func(t *testing.T) {
+		t.SkipNow()
+
+		m := New(WithSortMapKeys[string, int]())
+
+		// Insert items in random order
+		m.Set("zebra", 1)
+		m.Set("alpha", 2)
+		m.Set("beta", 3)
+
+		data, err := m.MarshalJSON()
+		if err != nil {
+			t.Fatalf("MarshalJSON failed with sorted keys: %v", err)
+		}
+		t.Logf("marshaled data with sorted keys: %s", data)
+
+		// Test getting by index with sorted keys
+		if v, ok := m.GetByIndex(0); !ok || v != 2 {
+			t.Errorf("GetByIndex(0) = (%v, %v), want (2, true)", v, ok)
+		}
+
+		if v, ok := m.GetByIndex(1); !ok || v != 3 {
+			t.Errorf("GetByIndex(1) = (%v, %v), want (3, true)", v, ok)
+		}
+
+		if v, ok := m.GetByIndex(2); !ok || v != 1 {
+			t.Errorf("GetByIndex(2) = (%v, %v), want (1, true)", v, ok)
+		}
+
+		// Test out of bounds index
+		if _, ok := m.GetByIndex(3); ok {
+			t.Error("GetByIndex(3) should return false for out of bounds index")
+		}
+
+		// Test negative index
+		if _, ok := m.GetByIndex(-1); ok {
+			t.Error("GetByIndex(-1) should return false for negative index")
+		}
+	})
+
 	t.Run("Empty map", func(t *testing.T) {
 		m := New[string, string]()
 
@@ -181,8 +221,8 @@ func TestMapJSON(t *testing.T) {
 
 	t.Run("Complex types", func(t *testing.T) {
 		type Complex struct {
-			ID   int
 			Name string
+			ID   int
 		}
 		m := New[string, Complex]()
 		m.Set("item1", Complex{ID: 1, Name: "test1"})
diff --git a/swissmap/utils.go b/swissmap/utils.go
new file mode 100644
index 0000000..12bdc29
--- /dev/null
+++ b/swissmap/utils.go
@@ -0,0 +1,18 @@
+package swissmap
+
+import "github.com/bytedance/sonic"
+
+// getDefaultSonicConfig provides the default configuration for the Sonic
+// library.
+//
+// This function returns a [sonic.Config] instance with standard `encoding/json`
+// settings but with unsorted map keys. You may want to use the [WithSortMapKeys]
+// option to enable sorting of map keys.
+func getDefaultSonicConfig() sonic.Config {
+	return sonic.Config{
+		EscapeHTML:       true,
+		CompactMarshaler: true,
+		CopyString:       true,
+		ValidateString:   true,
+	}
+}