228 lines
3.5 KiB
Markdown
228 lines
3.5 KiB
Markdown
---
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marp: true
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theme: gaia
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paginate: true
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backgroundColor: #fff
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header: "Web Engineering – DHBW Stuttgart"
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footer: "Michael Czechowski – SoSe 2025"
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---
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<style>
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:root {
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--color-foreground: #1a1a2e;
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--color-highlight: #005f8a;
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--color-dimmed: #4a6a7a;
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}
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section.invert {
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--color-foreground: #fff;
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}
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section {
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font-size: 1.7rem;
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}
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h1 {
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color: #005f8a;
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}
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section.invert h1 {
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color: #fff;
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}
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pre {
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background: #0f1e2e;
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color: #00b4d8;
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border-radius: 8px;
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border-left: 3px solid #005f8a;
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}
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pre code {
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background: transparent;
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color: inherit;
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}
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code {
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background: #1a3a4a;
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color: #00b4d8;
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padding: 0.15em 0.4em;
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border-radius: 4px;
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}
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a {
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color: var(--color-highlight);
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}
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</style>
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<!-- _class: invert -->
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<!-- _header: '' -->
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<!-- _backgroundColor: #001520 -->
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# Node.js – Scripting, Running and Building
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---
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# Node.js – Was ist das?
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- JavaScript Runtime (V8 Engine)
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- Server-side JavaScript
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- npm Package Manager
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- Ideal für: APIs, CLI Tools, Automation
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---
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<!-- _header: '' -->
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<!-- _footer: '' -->
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---
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# node --check und node -e
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```bash
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# Syntax check only
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node --check script.js
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# One-liner
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node -e "console.log('Hallo Welt')"
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```
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---
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# node -e Beispiele
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```bash
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# String
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node -e "console.log('Hello ' + process.argv[2])" Welt
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# File reading
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node -e "console.log(require('fs').readFileSync('data.json'))"
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# JSON parsen
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node -e "console.log(JSON.parse(process.argv[1]))" '{"a":1}'
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```
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---
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# require() – Module laden
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```javascript
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// Eigene Datei
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const utils = require('./utils');
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// npm Modul
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const express = require('express');
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// Built-in
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const fs = require('fs');
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const path = require('path');
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```
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---
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# __dirname und __filename
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```javascript
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// Aktuelles Verzeichnis (Node.js)
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console.log(__dirname); // /home/user/project/src
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console.log(__filename); // /home/user/project/src/app.js
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// Pfad joinen
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const configPath = path.join(__dirname, '..', 'config.json');
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```
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---
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# HTTP Server mit Node.js (Built-in)
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```javascript
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const http = require('http');
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const server = http.createServer((req, res) => {
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res.writeHead(200, { 'Content-Type': 'text/html' });
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res.end('<h1>Hallo Welt!</h1>');
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});
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server.listen(3000, () => {
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console.log('Server läuft auf Port 3000');
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});
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```
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---
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# fs – Dateien lesen/schreiben
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```javascript
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const fs = require('fs');
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// Async
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fs.readFile('data.json', 'utf8', (err, data) => {
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if (err) throw err;
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console.log(JSON.parse(data));
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});
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// Sync
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const content = fs.readFileSync('data.json', 'utf8');
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// Write
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fs.writeFile('output.txt', 'Hallo Welt', (err) => {
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if (err) throw err;
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});
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```
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---
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# package.json – Das Herzstück
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```json
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{
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"name": "mein-projekt",
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"version": "1.0.0",
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"main": "index.js",
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"scripts": {
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"start": "node index.js",
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"dev": "node --watch index.js",
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"test": "node --test"
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},
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"dependencies": {
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"express": "^4.18.0"
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},
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"devDependencies": {
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"nodemon": "^3.0.0"
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}
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}
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```
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---
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# npm Scripts
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```bash
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# npm run <script>
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npm run start
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npm run dev
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# Mit Argumenten
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npm run build -- --production
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# Lifecycle scripts
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npm install → postinstall
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npm start → start (direkt)
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```
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---
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# Node.js Module – exports
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```javascript
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// utils.js
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module.exports = {
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add: (a, b) => a + b,
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greet: (name) => `Hallo ${name}!`
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};
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// Oder einzelne Exporte
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module.exports.add = (a, b) => a + b;
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```
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---
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# Fragen?
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1. Wie startest du einen Node.js Server auf Port 8080?
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2. Was macht `node --check`?
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3. Wozu dient `package.json`? |