from github to this gitea

express JS hello world.md

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+up::[[express JS]]
+#informatique/javascript 
+
+```js
+// server-express.js
+const express = require('express')
+const app = express() // initialize app
+const port = 3000
+
+// GET callback function returns a response message
+app.get('/', (req, res) => {
+    res.send('Hello World! Welcome to Node.js')
+})
+
+app.listen(port, () => {
+    console.log(`Server listening at http://localhost:${port}`)
+})
+
+```