diff --git a/cope2n-fe/src/pages/inference/index.tsx b/cope2n-fe/src/pages/inference/index.tsx
index 0cd53cb..2433be2 100644
--- a/cope2n-fe/src/pages/inference/index.tsx
+++ b/cope2n-fe/src/pages/inference/index.tsx
@@ -23,6 +23,7 @@ const ENABLE_REVIEW = true;
 
 // Import the styles
 import '@react-pdf-viewer/core/lib/styles/index.css';
+import { normalizeData } from 'utils/field-value-process';
 
 
 const siderStyle: React.CSSProperties = {
@@ -355,6 +356,7 @@ const InferencePage = () => {
     setDataSource(newData);
     const newRevisedData = {};
     for (let i = 0; i < newData.length; i++) {
+      newData[i].revised = normalizeData(newData[i].key, newData[i].revised);
       newRevisedData[newData[i].key] = newData[i].revised;
     }
     updateRevisedData(newRevisedData).then(() => {
@@ -370,30 +372,7 @@ const InferencePage = () => {
     const newData = [...dataSource];
     const newRevisedData = {};
     for (let i = 0; i < newData.length; i++) {
-      if (newData[i].revised === "<empty>") {
-        newData[i].revised = null;
-      }
-      if (typeof(newData[i].revised) === "string") {
-        newData[i].revised = newData[i].revised.trim();
-      }
-      if (newData[i].revised === "" || newData[i].revised === null || newData[i].revised === undefined) {
-        newData[i].revised = null;
-      }
-      if ((newData[i].key === "imei_number" || newData[i].key === "purchase_date") && typeof(newData[i].revised) === "string") {
-        // Convert to list
-        newData[i].revised = new Array(newData[i].revised.split(","));
-      }
-      if (Array.isArray(newData[i].revised)) {
-        // Trim all empty strings
-        for (let j = 0; j < newData[i].revised.length; j++) {
-          if (typeof(newData[i].revised[j]) === "string") {
-            newData[i].revised[j] = newData[i].revised[j].trim();
-          }
-          if (newData[i].revised[j] === "<empty>") {
-            newData[i].revised[j] = null;
-          }
-        }
-      }
+      newData[i].revised = normalizeData(newData[i].key, newData[i].revised);
       newRevisedData[newData[i].key] = newData[i].revised;
     }
     updateRevisedData(newRevisedData).then(() => {
diff --git a/cope2n-fe/src/pages/reviews/index.tsx b/cope2n-fe/src/pages/reviews/index.tsx
index 6f71652..6302b5c 100644
--- a/cope2n-fe/src/pages/reviews/index.tsx
+++ b/cope2n-fe/src/pages/reviews/index.tsx
@@ -21,6 +21,8 @@ import { Viewer } from '@react-pdf-viewer/core';
 // Import the styles
 import '@react-pdf-viewer/core/lib/styles/index.css';
 
+import { normalizeData } from 'utils/field-value-process';
+
 
 const siderStyle: React.CSSProperties = {
   backgroundColor: '#fafafa',
@@ -415,6 +417,7 @@ const ReviewPage = () => {
     setDataSource(newData);
     const newRevisedData = {};
     for (let i = 0; i < newData.length; i++) {
+      newData[i].revised = normalizeData(newData[i].key, newData[i].revised);
       newRevisedData[newData[i].key] = newData[i].revised;
     }
     updateRevisedData(newRevisedData).then(() => {
@@ -430,30 +433,7 @@ const ReviewPage = () => {
     const newData = [...dataSource];
     const newRevisedData = {};
     for (let i = 0; i < newData.length; i++) {
-      if (newData[i].revised === "<empty>") {
-        newData[i].revised = null;
-      }
-      if (typeof(newData[i].revised) === "string") {
-        newData[i].revised = newData[i].revised.trim();
-      }
-      if (newData[i].revised === "" || newData[i].revised === null || newData[i].revised === undefined) {
-        newData[i].revised = null;
-      }
-      if ((newData[i].key === "imei_number" || newData[i].key === "purchase_date") && typeof(newData[i].revised) === "string") {
-        // Convert to list
-        newData[i].revised = new Array(newData[i].revised.split(","));
-      }
-      if (Array.isArray(newData[i].revised)) {
-        // Trim all empty strings
-        for (let j = 0; j < newData[i].revised.length; j++) {
-          if (typeof(newData[i].revised[j]) === "string") {
-            newData[i].revised[j] = newData[i].revised[j].trim();
-          }
-          if (newData[i].revised[j] === "<empty>") {
-            newData[i].revised[j] = null;
-          }
-        }
-      }
+      newData[i].revised = normalizeData(newData[i].key, newData[i].revised);
       newRevisedData[newData[i].key] = newData[i].revised;
     }
     updateRevisedData(newRevisedData).then(() => {
diff --git a/cope2n-fe/src/utils/field-value-process.ts b/cope2n-fe/src/utils/field-value-process.ts
new file mode 100644
index 0000000..ee24573
--- /dev/null
+++ b/cope2n-fe/src/utils/field-value-process.ts
@@ -0,0 +1,32 @@
+const isAllSpaces = (text) => {
+    if (typeof (text) != "string") {
+        return false;
+    }
+    return text.trim().length === 0 || text === "<empty>";
+};
+
+const normalizeData = (key, value) => {
+    if (value === "<empty>") {
+        value = null;
+    }
+    if (typeof (value) === "string") {
+        value = value.trim();
+    }
+    if (value === "" || value === null || value === undefined) {
+        value = null;
+    }
+    if (isAllSpaces(value)) {
+        value = null;
+    }
+    if (["imei_number", "purchase_date"].includes(key) && typeof (value) === "string") {
+        value = value.split(",")
+    }
+    if (typeof (value) === "object" && value?.length > 0) {
+        for (let i = 0; i < value.length; i++) {
+            value[i] = normalizeData("text", value[i]);
+        }
+    }
+    return value;
+}
+
+export { normalizeData };
\ No newline at end of file