diff --git a/webroot/css/style.css b/webroot/css/style.css
index c4cb7427..3fb69b29 100644
--- a/webroot/css/style.css
+++ b/webroot/css/style.css
@@ -522,27 +522,6 @@ h3 {
   color: #495057;
 }
 
-.json-key {
-  color: #0066cc;
-  font-weight: bold;
-}
-
-.json-string {
-  color: #d14;
-}
-
-.json-number {
-  color: #905;
-}
-
-.json-boolean {
-  color: #1e90ff;
-}
-
-.json-null {
-  color: #999;
-}
-
 .required-asterisk {
   color: #f44336;
   margin-left: 2px;
diff --git a/webroot/js/component/output.js b/webroot/js/component/output.js
index c7aef5e2..25f5993c 100644
--- a/webroot/js/component/output.js
+++ b/webroot/js/component/output.js
@@ -10,18 +10,6 @@ function createOutputSection() {
   `;
 }
 
-function highlightJSON(json) {
-  if (typeof json !== 'string') {
-    json = JSON.stringify(json, null, 2);
-  }
-  
-  return json
-    .replace(/("[\w\s_-]+")(\s*:)/g, '<span class="json-key">$1</span>$2')
-    .replace(/:\s*(".*?")/g, ': <span class="json-string">$1</span>')
-    .replace(/:\s*(\d+\.?\d*)/g, ': <span class="json-number">$1</span>')
-    .replace(/:\s*(true|false)/g, ': <span class="json-boolean">$1</span>')
-    .replace(/:\s*(null)/g, ': <span class="json-null">$1</span>');
-}
 
 function formatOutput(data) {
   if (typeof data === 'string') {
@@ -40,7 +28,7 @@ function formatOutput(data) {
 function displayOutput(output) {
   const target = document.querySelector('#standardOutput');
   if (!target) return;
-  target.innerHTML = highlightJSON(formatOutput(output));
+  target.textContent = formatOutput(output);
 }
 
 function clearOutput() {
@@ -74,14 +62,13 @@ function initializeOutput() {
   if (standardOutput) {
     const initialJSON = standardOutput.textContent;
     if (initialJSON.trim()) {
-      standardOutput.innerHTML = highlightJSON(initialJSON);
+      standardOutput.textContent = initialJSON;
     }
   }
 }
 
 export { 
   createOutputSection, 
-  highlightJSON, 
   displayOutput, 
   displayError, 
   clearError,