src/App.tsx

@@ -90,6 +90,15 @@ function App() {
     });
   }
 
+  function handleTemplateSaved(newContent: string) {
+    setConfig(prevConfig => {
+      const newConfig = new Config();
+      newConfig.envs = prevConfig.envs;
+      newConfig.addTemplate(newContent);
+      return newConfig;
+    });
+  }
+
   return (
     <>
       <main className="container-fluid m-2">
@@ -111,7 +120,7 @@ function App() {
                 onRemove={handleEnvRemoved} />
             </section>
             <section id="content" className="col-8 col-xl-7 border-start ms-1">
-              <Content env={currentEnv} config={config} />
+              <Content env={currentEnv} config={config} onTemplateSaved={handleTemplateSaved} />
             </section>
           </div>)
           :

src/componets/content/ConfigTemplate.tsx

@@ -0,0 +1,118 @@
+import { useState } from "react";
+import Highlight from 'react-highlight';
+import 'highlight.js/styles/far.css';
+import { Config } from "../../models/Config";
+
+interface ConfigTemplateProps {
+  config: Config;
+  onSaved: (newContent: string) => void;
+}
+
+export function ConfigTemplate(props: ConfigTemplateProps) {
+  const [mode, setMode] = useState<'view' | 'edit'>('view');
+  const [draftContent, setDraftContent] = useState(props.config.template.content);
+  const [originalContent, setOriginalContent] = useState(props.config.template.content);
+  const [jsonError, setJsonError] = useState<string | null>(null);
+
+  // Sync draft when config changes (in view mode)
+  if (mode === 'view') {
+    setDraftContent(props.config.template.content);
+  }
+
+  function handleEdit() {
+    setOriginalContent(props.config.template.content);
+    setDraftContent(props.config.template.content);
+    setJsonError(null);
+    setMode('edit');
+  }
+
+  function handleRevert() {
+    setDraftContent(originalContent);
+    setJsonError(null);
+    setMode('view');
+  }
+
+  function handleSave() {
+    // Validate JSON before saving
+    try {
+      JSON.parse(draftContent);
+      setJsonError(null);
+      props.onSaved(draftContent);
+      setMode('view');
+    } catch (e) {
+      setJsonError((e as Error).message);
+    }
+  }
+
+  function handleDraftChange(value: string) {
+    setDraftContent(value);
+    // Validate JSON on every change
+    try {
+      if (value.trim()) {
+        JSON.parse(value);
+        setJsonError(null);
+      } else {
+        setJsonError(null);
+      }
+    } catch (e) {
+      setJsonError((e as Error).message);
+    }
+  }
+
+  const isValidJson = jsonError === null;
+
+  return (
+    <div className="config-template-editor">
+      {mode === 'view' ? (
+        <>
+          <div className="mb-2">
+            <button className="btn btn-primary btn-sm" onClick={handleEdit}>
+              ✎ Edit
+            </button>
+          </div>
+          <Highlight className="language-json">
+            {props.config.template.content || "{}"}
+          </Highlight>
+        </>
+      ) : (
+        <>
+          <div className="mb-2 d-flex gap-2 align-items-center">
+            <button 
+              className="btn btn-success btn-sm" 
+              onClick={handleSave}
+              disabled={!isValidJson}
+            >
+              ✓ Save
+            </button>
+            <button 
+              className="btn btn-secondary btn-sm" 
+              onClick={handleRevert}
+            >
+              × Revert
+            </button>
+            <span className={`ms-2 ${isValidJson ? 'text-success' : 'text-danger'}`}>
+              {isValidJson ? 'Valid JSON' : 'Invalid JSON'}
+            </span>
+          </div>
+          {jsonError && (
+            <div className="alert alert-danger py-1 px-2 mb-2" style={{ fontSize: '0.875rem' }}>
+              {jsonError}
+            </div>
+          )}
+          <textarea
+            className={`form-control font-monospace ${isValidJson ? 'border-success' : 'border-danger'}`}
+            value={draftContent}
+            onChange={(e) => handleDraftChange(e.target.value)}
+            rows={20}
+            style={{ 
+              fontFamily: 'monospace',
+              whiteSpace: 'pre',
+              overflowX: 'auto'
+            }}
+            spellCheck={false}
+          />
+        </>
+      )}
+    </div>
+  );
+}

src/componets/content/Content.tsx

@@ -4,9 +4,10 @@ import Highlight from 'react-highlight'
 import 'highlight.js/styles/far.css'
 import { Builder } from "../../builders";
 import { Config } from "../../models/Config";
+import { ConfigTemplate } from "./ConfigTemplate";
 
 
-export function Content(props: { config: Config, env: Env }) {
+export function Content(props: { config: Config, env: Env, onTemplateSaved: (newContent: string) => void }) {
     const [selectTab, setTab] = useState(ContentType.Env);
 
     return (
@@ -14,7 +15,7 @@ export function Content(props: { config: Config, env: Env }) {
             <ContentTabs onSelected={(id) => setTab(id)} />
             <div className="">
                 {selectTab == ContentType.Env ? (<ContentParams env={props.env} />) : ""}
-                {selectTab == ContentType.Json ? (<ContentTemplate env={props.env} config={props.config} />) : ""}
+                {selectTab == ContentType.Json ? (<ConfigTemplate config={props.config} onSaved={props.onTemplateSaved} />) : ""}
                 {selectTab == ContentType.Raw ? (<ContentRaw config={props.config} env={props.env} />) : ""}
                 {selectTab == ContentType.Test ? (<ContentTest config={props.config} env={props.env} />) : ""}
             </div>
@@ -139,18 +140,6 @@ function fillTemplate(config: Config, env: Env): string {
     return filledTemplate;
 }
 
-function ContentTemplate(props: { config: Config, env: Env }) {
-    
-    let text = props.config.getTemplateAsJson() ?? "{//no content. at all. tottaly empty!!!\n}";
-    return (
-        <>
-            <Highlight className="language-json" >
-                {text ?? ""}
-            </Highlight>
-        </>
-    )
-}
-
 function ContentParams(props: { env: Env }) {
     const bldr = Builder.getEnv(props.env);