diff --git a/api_test.go b/api_test.go
index 1e1c5d086..8848d48d4 100644
--- a/api_test.go
+++ b/api_test.go
@@ -121,6 +121,30 @@ func TestEdits(t *testing.T) {
 	}
 }
 
+// TestModeration Tests the moderations endpoint of the API using the mocked server.
+func TestModerations(t *testing.T) {
+	// create the test server
+	var err error
+	ts := OpenAITestServer()
+	ts.Start()
+	defer ts.Close()
+
+	client := NewClient(testAPIToken)
+	ctx := context.Background()
+	client.BaseURL = ts.URL + "/v1"
+
+	// create an edit request
+	model := "text-moderation-stable"
+	moderationReq := ModerationRequest{
+		Model: &model,
+		Input: "I want to kill them.",
+	}
+	_, err = client.Moderations(ctx, moderationReq)
+	if err != nil {
+		t.Fatalf("Moderation error: %v", err)
+	}
+}
+
 func TestEmbedding(t *testing.T) {
 	embeddedModels := []EmbeddingModel{
 		AdaSimilarity,
@@ -160,6 +184,25 @@ func TestEmbedding(t *testing.T) {
 	}
 }
 
+func TestImages(t *testing.T) {
+	// create the test server
+	var err error
+	ts := OpenAITestServer()
+	ts.Start()
+	defer ts.Close()
+
+	client := NewClient(testAPIToken)
+	ctx := context.Background()
+	client.BaseURL = ts.URL + "/v1"
+
+	req := ImageRequest{}
+	req.Prompt = "Lorem ipsum"
+	_, err = client.CreateImage(ctx, req)
+	if err != nil {
+		t.Fatalf("CreateImage error: %v", err)
+	}
+}
+
 // getEditBody Returns the body of the request to create an edit.
 func getEditBody(r *http.Request) (EditsRequest, error) {
 	edit := EditsRequest{}
@@ -261,6 +304,21 @@ func handleCompletionEndpoint(w http.ResponseWriter, r *http.Request) {
 	fmt.Fprintln(w, string(resBytes))
 }
 
+// getCompletionBody Returns the body of the request to create a completion.
+func getCompletionBody(r *http.Request) (CompletionRequest, error) {
+	completion := CompletionRequest{}
+	// read the request body
+	reqBody, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		return CompletionRequest{}, err
+	}
+	err = json.Unmarshal(reqBody, &completion)
+	if err != nil {
+		return CompletionRequest{}, err
+	}
+	return completion, nil
+}
+
 // handleImageEndpoint Handles the images endpoint by the test server.
 func handleImageEndpoint(w http.ResponseWriter, r *http.Request) {
 	var err error
@@ -296,34 +354,78 @@ func handleImageEndpoint(w http.ResponseWriter, r *http.Request) {
 	fmt.Fprintln(w, string(resBytes))
 }
 
-// getCompletionBody Returns the body of the request to create a completion.
-func getCompletionBody(r *http.Request) (CompletionRequest, error) {
-	completion := CompletionRequest{}
+// getImageBody Returns the body of the request to create a image.
+func getImageBody(r *http.Request) (ImageRequest, error) {
+	image := ImageRequest{}
 	// read the request body
 	reqBody, err := ioutil.ReadAll(r.Body)
 	if err != nil {
-		return CompletionRequest{}, err
+		return ImageRequest{}, err
 	}
-	err = json.Unmarshal(reqBody, &completion)
+	err = json.Unmarshal(reqBody, &image)
 	if err != nil {
-		return CompletionRequest{}, err
+		return ImageRequest{}, err
 	}
-	return completion, nil
+	return image, nil
 }
 
-// getImageBody Returns the body of the request to create a image.
-func getImageBody(r *http.Request) (ImageRequest, error) {
-	image := ImageRequest{}
+// handleModerationEndpoint Handles the moderation endpoint by the test server.
+func handleModerationEndpoint(w http.ResponseWriter, r *http.Request) {
+	var err error
+	var resBytes []byte
+
+	// completions only accepts POST requests
+	if r.Method != "POST" {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+	}
+	var moderationReq ModerationRequest
+	if moderationReq, err = getModerationBody(r); err != nil {
+		http.Error(w, "could not read request", http.StatusInternalServerError)
+		return
+	}
+
+	resCat := ResultCategories{}
+	resCatScore := ResultCategoryScores{}
+	switch {
+	case strings.Contains(moderationReq.Input, "kill"):
+		resCat = ResultCategories{Violence: true}
+		resCatScore = ResultCategoryScores{Violence: 1}
+	case strings.Contains(moderationReq.Input, "hate"):
+		resCat = ResultCategories{Hate: true}
+		resCatScore = ResultCategoryScores{Hate: 1}
+	case strings.Contains(moderationReq.Input, "suicide"):
+		resCat = ResultCategories{SelfHarm: true}
+		resCatScore = ResultCategoryScores{SelfHarm: 1}
+	case strings.Contains(moderationReq.Input, "porn"):
+		resCat = ResultCategories{Sexual: true}
+		resCatScore = ResultCategoryScores{Sexual: 1}
+	}
+
+	result := Result{Categories: resCat, CategoryScores: resCatScore, Flagged: true}
+
+	res := ModerationResponse{
+		ID:    strconv.Itoa(int(time.Now().Unix())),
+		Model: *moderationReq.Model,
+	}
+	res.Results = append(res.Results, result)
+
+	resBytes, _ = json.Marshal(res)
+	fmt.Fprintln(w, string(resBytes))
+}
+
+// getModerationBody Returns the body of the request to do a moderation.
+func getModerationBody(r *http.Request) (ModerationRequest, error) {
+	moderation := ModerationRequest{}
 	// read the request body
 	reqBody, err := ioutil.ReadAll(r.Body)
 	if err != nil {
-		return ImageRequest{}, err
+		return ModerationRequest{}, err
 	}
-	err = json.Unmarshal(reqBody, &image)
+	err = json.Unmarshal(reqBody, &moderation)
 	if err != nil {
-		return ImageRequest{}, err
+		return ModerationRequest{}, err
 	}
-	return image, nil
+	return moderation, nil
 }
 
 // numTokens Returns the number of GPT-3 encoded tokens in the given text.
@@ -335,25 +437,6 @@ func numTokens(s string) int {
 	return int(float32(len(s)) / 4)
 }
 
-func TestImages(t *testing.T) {
-	// create the test server
-	var err error
-	ts := OpenAITestServer()
-	ts.Start()
-	defer ts.Close()
-
-	client := NewClient(testAPIToken)
-	ctx := context.Background()
-	client.BaseURL = ts.URL + "/v1"
-
-	req := ImageRequest{}
-	req.Prompt = "Lorem ipsum"
-	_, err = client.CreateImage(ctx, req)
-	if err != nil {
-		t.Fatalf("CreateImage error: %v", err)
-	}
-}
-
 // OpenAITestServer Creates a mocked OpenAI server which can pretend to handle requests during testing.
 func OpenAITestServer() *httptest.Server {
 	return httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
@@ -373,6 +456,8 @@ func OpenAITestServer() *httptest.Server {
 		case "/v1/completions":
 			handleCompletionEndpoint(w, r)
 			return
+		case "/v1/moderations":
+			handleModerationEndpoint(w, r)
 		case "/v1/images/generations":
 			handleImageEndpoint(w, r)
 		// TODO: implement the other endpoints