diff --git a/src/clients/openai.rs b/src/clients/openai.rs
index 3bea007e..4a51543b 100644
--- a/src/clients/openai.rs
+++ b/src/clients/openai.rs
@@ -172,6 +172,7 @@ impl From<ChatCompletion> for ChatCompletionsResponse {
 }
 
 #[derive(Debug, Default, Clone, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
 pub struct ChatCompletionsRequest {
     /// A list of messages comprising the conversation so far.
     pub messages: Vec<Message>,
@@ -290,6 +291,7 @@ pub struct ChatCompletionsRequest {
 
 /// Structure to contain parameters for detectors.
 #[derive(Default, Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
 pub struct DetectorConfig {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub input: Option<HashMap<String, DetectorParams>>,
@@ -398,6 +400,7 @@ pub enum Role {
 }
 
 #[derive(Debug, Default, Clone, Serialize, Deserialize)]
+#[serde(deny_unknown_fields)]
 pub struct Message {
     /// The role of the author of this message.
     pub role: Role,
diff --git a/src/orchestrator/chat_completions_detection.rs b/src/orchestrator/chat_completions_detection.rs
index 13519326..083ef977 100644
--- a/src/orchestrator/chat_completions_detection.rs
+++ b/src/orchestrator/chat_completions_detection.rs
@@ -396,8 +396,8 @@ mod tests {
 
     // Test to verify preprocess_chat_messages works correctly for multiple content type detectors
     // with single message in chat request
-    #[tokio::test]
-    async fn pretest_process_chat_messages_multiple_content_detector() {
+    #[test]
+    fn pretest_process_chat_messages_multiple_content_detector() {
         // Test setup
         let clients = ClientMap::new();
         let detector_1_id = "detector1";
@@ -436,8 +436,8 @@ mod tests {
 
     // Test preprocess_chat_messages returns error correctly for multiple content type detectors
     // with incorrect message requirements
-    #[tokio::test]
-    async fn pretest_process_chat_messages_error_handling() {
+    #[test]
+    fn pretest_process_chat_messages_error_handling() {
         // Test setup
         let clients = ClientMap::new();
         let detector_1_id = "detector1";
@@ -473,4 +473,87 @@ mod tests {
             "validation error: Last message role must be user, assistant, or system"
         );
     }
+    // validate chat completions request with invalid fields
+    // (nonexistant fields or typos)
+    #[test]
+    fn test_validate() {
+        // Additional unknown field (additional_field)
+        let json_data = r#"
+        {
+           "messages": [
+            {
+                "content": "this is a nice sentence",
+                "role": "user",
+                "name": "string"
+            }
+            ],
+            "model": "my_model",
+            "additional_field": "test",
+            "n": 1,
+            "temperature": 1,
+            "top_p": 1,
+            "user": "user-1234",
+            "detectors": {
+                "input": {}
+            }
+        }
+        "#;
+        let result: Result<ChatCompletionsRequest, _> = serde_json::from_str(json_data);
+        assert!(result.is_err());
+        let error = result.unwrap_err().to_string();
+        assert!(error
+            .to_string()
+            .contains("unknown field `additional_field"));
+
+        // Additional unknown field (additional_message")
+        let json_data = r#"
+        {
+           "messages": [
+            {
+                "content": "this is a nice sentence",
+                "role": "user",
+                "name": "string",
+                "additional_msg: "test"
+            }
+            ],
+            "model": "my_model",
+            "n": 1,
+            "temperature": 1,
+            "top_p": 1,
+            "user": "user-1234",
+            "detectors": {
+                "input": {}
+            }
+        }
+        "#;
+        let result: Result<ChatCompletionsRequest, _> = serde_json::from_str(json_data);
+        assert!(result.is_err());
+        let error = result.unwrap_err().to_string();
+        assert!(error.to_string().contains("unknown field `additional_msg"));
+
+        // Additional unknown field (typo for input field in detectors)
+        let json_data = r#"
+         {
+            "messages": [
+             {
+                 "content": "this is a nice sentence",
+                 "role": "user",
+                 "name": "string"
+             }
+             ],
+             "model": "my_model",
+             "n": 1,
+             "temperature": 1,
+             "top_p": 1,
+             "user": "user-1234",
+             "detectors": {
+                 "inputs": {}
+             }
+         }
+         "#;
+        let result: Result<ChatCompletionsRequest, _> = serde_json::from_str(json_data);
+        assert!(result.is_err());
+        let error = result.unwrap_err().to_string();
+        assert!(error.to_string().contains("unknown field `inputs"));
+    }
 }