seo: add crawlable content

Author: danivek

src/index.html

@@ -13,6 +13,7 @@
         content="JSON editor, JSON formatter, JSON viewer, JSON validator, JSON repair, JSON compare, JSON schema, JSONPath, JMESPath, JSON diff, online JSON tool, JSON beautifier, JSON minifier" />
     <meta name="robots" content="index, follow" />
     <meta name="author" content="danivek" />
+    <meta name="application-name" content="JSONLab" />
     <meta name="theme-color" content="#4f46e5" />
     <link rel="canonical" href="https://danivek.github.io/JSONLab/" />
 
@@ -425,6 +426,27 @@ <h2>CSV Options</h2>
 
     <!-- App Scripts -->
     <script type="module" src="js/main.js"></script>
+
+    <!-- Crawlable content for search engines (hidden visually, visible to bots) -->
+    <noscript>
+        <div style="max-width:800px;margin:2rem auto;font-family:sans-serif;padding:0 1rem;">
+            <h1>JSONLab — Free Online JSON Editor</h1>
+            <p>JSONLab is a free, browser-based JSON editor that requires no installation. It provides powerful tools for working with JSON data directly in your browser.</p>
+            <h2>Features</h2>
+            <ul>
+                <li><strong>JSON Editor</strong> — Edit JSON with syntax highlighting and real-time error detection powered by Monaco Editor (VS Code engine).</li>
+                <li><strong>JSON Formatter</strong> — Beautify or minify JSON with a single click.</li>
+                <li><strong>JSON Validator</strong> — Validate JSON syntax and get precise error locations.</li>
+                <li><strong>JSON Repair</strong> — Automatically fix common issues like trailing commas, single quotes, and unquoted keys.</li>
+                <li><strong>JSON Compare / Diff</strong> — Compare two JSON documents side by side and see a detailed change summary.</li>
+                <li><strong>JSON Query</strong> — Query JSON using JSONPath Plus, JMESPath, or JSON Query language.</li>
+                <li><strong>JSON Schema Validation</strong> — Validate a JSON payload against a JSON Schema and generate schemas automatically.</li>
+                <li><strong>Tree &amp; Table View</strong> — Explore JSON in a collapsible tree or a spreadsheet-like table.</li>
+                <li><strong>Import &amp; Export</strong> — Load JSON from files, URLs, or CSV. Export results as .json files.</li>
+            </ul>
+            <p>JSONLab works entirely in your browser — your data never leaves your machine.</p>
+        </div>
+    </noscript>
 </body>
 
 </html>