no more string as a return output only json

app.py

@@ -1,6 +1,7 @@
 import gradio as gr
 import os
 import sys
+import json
 
 sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 from api.predict import predict_review, models_loaded
@@ -9,32 +10,22 @@ def analyze_review(reviewText):
     from api.predict import models_loaded
     
     if not reviewText or len(reviewText.strip()) == 0:
-        return "error: please enter some text"
+        return json.dumps({"error": "please enter some text"}, indent=2)
     
     if not models_loaded:
-        return "models are loading for the first time, this will take 20-30 minutes. please wait..."
+        return json.dumps({"error": "models are loading for the first time, this will take 20-30 minutes. please wait..."}, indent=2)
     
     try:
         result = predict_review(reviewText)
         print(f"raw result: {result}", flush=True)
         
         if "error" in result and result["prediction"] == "error":
-            return f"error: {result['error']}"
+            return json.dumps({"error": result['error']}, indent=2)
         
-        output = f"""prediction: {result['prediction']}
-        
-confidence: {result['confidence']:.4f}
-fake probability: {result['fake_probability']:.4f}
-genuine probability: {result['genuine_probability']:.4f}
-model agreement: {result['model_agreement']:.2f}
-is fake: {result['is_fake']}
-length category: {result['length_category']}
-token count: {result['token_count']}"""
-        
-        return output
+        return json.dumps(result, indent=2)
         
     except Exception as e:
-        return f"error: {str(e)}"
+        return json.dumps({"error": str(e)}, indent=2)
 
 demo = gr.Interface(
     fn=analyze_review,