new examples

node/expressjs/index.js

@@ -0,0 +1,28 @@
+const express = require('express');
+
+const app = express();
+const PORT = process.env.PORT || 3000;
+
+// Runtime env vars (read at server startup)
+const RUNTIME_PRIVATE_VAR = process.env.RUNTIME_PRIVATE_VAR || 'default-value';
+const RUNTIME_PUBLIC_VAR = process.env.RUNTIME_PUBLIC_VAR || 'default-value';
+
+console.log('=== Runtime Variables ===');
+console.log('RUNTIME_PRIVATE_VAR:', RUNTIME_PRIVATE_VAR);
+console.log('RUNTIME_PUBLIC_VAR:', RUNTIME_PUBLIC_VAR);
+
+app.get('/', (req, res) => {
+  res.json({
+    message: 'Hello from Express.js!',
+    runtimePrivateVar: RUNTIME_PRIVATE_VAR,
+    runtimePublicVar: RUNTIME_PUBLIC_VAR,
+  });
+});
+
+app.get('/health', (req, res) => {
+  res.json({ status: 'ok' });
+});
+
+app.listen(PORT, () => {
+  console.log(`Server running on port ${PORT}`);
+});