new examples

node/expressjs/.dockerignore

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+node_modules/

node/expressjs/.gitignore

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+node_modules/

node/expressjs/README.md

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+# Express.js
+
+A simple HTTP server using Express.js.
+
+## Getting Started
+
+```bash
+npm install
+npm start
+```
+
+## Endpoints
+
+- `GET /` - Returns `{"message": "Hello from Express.js!"}`
+- `GET /health` - Returns `{"status": "ok"}`

node/expressjs/index.js

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+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}`);
+});

node/expressjs/package.json

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+{
+  "name": "expressjs-webserver",
+  "version": "1.0.0",
+  "description": "A simple backend webserver written in Express.js",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js"
+  },
+  "keywords": [],
+  "license": "MIT",
+  "dependencies": {
+    "express": "^4.21.0"
+  }
+}