[Backend] NodeJS - week 1

courses/backend/node/README.md

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-# Node
+# Node.js
 
-Coming soon
+This module is part of the Backend specialism and focuses on using Node.js to build backend services, APIs, and databases. It builds on the Introduction to Backend module from Foundation with more advanced tooling, patterns, and responsibilities.
+
+## Contents
+
+| Week | Topic                    | Preparation                         | Lesson Plan                         | Assignment                            |
+| ---- | ------------------------ | ----------------------------------- | ----------------------------------- | ------------------------------------- |
+| 1.   | Express                  | [Preparation](week1/preparation.md) | [Assignment](./week1/assignment.md) | [Session plan](week1/session-plan.md) |
+| 2.   | Database connection; API | [Preparation](week2/preparation.md) | [Assignment](./week1/assignment.md) | [Session plan](week2/session-plan.md) |
+
+## Module Learning Goals
+
+By the end of this module, you will be able to:
+
+- [ ] Build web servers with Express.js
+- [ ] Design and implement APIs using HTTP methods following REST principles
+- [ ] Use middlewares for authentication, logging, and validation
+- [ ] Test APIs using Postman
+- [ ] Use logging and debugging tools to monitor and troubleshoot applications
+- [ ] Connect to databases and implement CRUD operations

courses/backend/node/module-materials/examples/middleware.js

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+import express from "express";
+const app = express();
+
+app.use((req, _res, next) => {
+  console.log(req.headers["accept-language"]);
+  const isFromDenmark = req.headers["accept-language"].includes("da");
+  console.log(isFromDenmark);
+  req.isFromDenmark = isFromDenmark;
+
+  next();
+});
+
+app.listen(3000, function () {
+  console.log(`> Ready on http://localhost:3000`);
+});

courses/backend/node/module-materials/examples/parameters.js

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+import express from "express";
+const app = express();
+
+// query parameters
+// http://localhost:3000/query-parameters?hej=23,%20sd-p
+app.get("/query-parameters", (req, res) => {
+  console.log(req.query);
+  res.send({ data: req.query });
+});
+
+// URL parameters
+// http://localhost:3000/parameters/apple-eater
+app.get("/parameters/:username", (req, res) => {
+  console.log(req.params);
+  res.send({ data: req.params });
+});
+
+app.listen(3000, function () {
+  console.log(`> Ready on http://localhost:3000`);
+});

courses/backend/node/module-materials/examples/route-order.js

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+import express from "express";
+const app = express();
+
+app.get("/data", (_req, res) => {
+  res.send({ data: 1 });
+});
+
+app.get("/data", (_req, res) => {
+  res.send({ data: 2 });
+});
+
+// Which one is being called when?
+
+app.get("/data/:id", (req, res) => {
+  console.log("Parametrized URL");
+  res.send({ data: req.params });
+});
+
+app.get("/data/overview", (req, res) => {
+  console.log("Overview");
+  res.send({ data: req.params });
+});
+
+app.listen(3000, function () {
+  console.log(`> Ready on http://localhost:3000`);
+});

courses/backend/node/module-materials/examples/router.js

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+import express from "express";
+const router = express.Router();
+
+router.get("/", async (_request, response) => {
+  response.send({ data: "from app.use" });
+});
+
+export default router;

courses/backend/node/module-materials/index.js

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+import express from "express";
+import router from "./examples/router.js";
+
+const app = express();
+
+app.get("/", (_req, res) => {
+  res.send({ data: "from app.get" });
+});
+
+app.use("/use", router);
+
+app.listen(3000, function () {
+  console.log(`> Ready on http://localhost:3000`);
+});