diff --git a/src/math/Vector2.js b/src/math/Vector2.js
index 8000533a7c1f3..f415209e83547 100644
--- a/src/math/Vector2.js
+++ b/src/math/Vector2.js
@@ -434,6 +434,12 @@ class Vector2 {
 
 	}
 
+	toJSON() {
+
+		return { x: this.x, y: this.y };
+
+	}
+
 	fromBufferAttribute( attribute, index, offset ) {
 
 		if ( offset !== undefined ) {
diff --git a/src/math/Vector3.js b/src/math/Vector3.js
index 8ab45747d6d8d..1ff08f472a2bb 100644
--- a/src/math/Vector3.js
+++ b/src/math/Vector3.js
@@ -696,6 +696,12 @@ class Vector3 {
 
 	}
 
+	toJSON() {
+
+		return { x: this.x, y: this.y, z: this.z };
+
+	}
+
 	fromBufferAttribute( attribute, index, offset ) {
 
 		if ( offset !== undefined ) {
diff --git a/src/math/Vector4.js b/src/math/Vector4.js
index d2edcf22df7db..c893b3cc1a73a 100644
--- a/src/math/Vector4.js
+++ b/src/math/Vector4.js
@@ -622,6 +622,12 @@ class Vector4 {
 
 	}
 
+	toJSON() {
+
+		return { x: this.x, y: this.y, z: this.z, w: this.w };
+
+	}
+
 	fromBufferAttribute( attribute, index, offset ) {
 
 		if ( offset !== undefined ) {