express routing

1//to run : node filename.js
2const express = require('express')
3const app = express()
4const port = 3000
5
6app.get('/', (req, res) => res.send('Hello World!'))
7
8app.listen(port, () => console.log(`Example app listening at http://localhost:${port}`))
9
10//visit localhost:3000
11// assuming you have done 1) npm init 2) npm install express

1var express = require('express')
2var router = express.Router()
3
4// middleware that is specific to this router
5router.use(function timeLog (req, res, next) {
6  console.log('Time: ', Date.now())
7  next()
8})
9// define the home page route
10router.get('/', function (req, res) {
11  res.send('Birds home page')
12})
13// define the about route
14router.get('/about', function (req, res) {
15  res.send('About birds')
16})
17
18module.exports = router
19

1var express = require('express');
2var router = express.Router();
3
4// middleware that is specific to this router
5router.use(function timeLog (req, res, next) {
6  console.log('Time: ', Date.now());
7  next();
8});
9// define the home page route
10router.get('/', function (req, res) {
11  res.send('Birds home page');
12});
13// define the about route
14router.get('/about', function (req, res) {
15  res.send('About birds');
16});
17
18module.exports = router;

1app.get('/users/:userId/books/:bookId', function (req, res) {
2  res.send(req.params)
3})
4

1const express = require('express');
2const app = express();
3
4const { getElementById, getIndexById, updateElement,
5  seedElements, createElement } = require('./utils');
6
7const PORT = process.env.PORT || 4001;
8// Use static server to serve the Express Yourself Website
9app.use(express.static('public'));
10
11const expressions = [];
12seedElements(expressions, 'expressions');
13const animals = [];
14seedElements(animals, 'animals');
15
16// Get all expressions
17app.get('/expressions', (req, res, next) => {
18  res.send(expressions);
19});
20
21// Get a single expression
22app.get('/expressions/:id', (req, res, next) => {
23  const foundExpression = getElementById(req.params.id, expressions);
24  if (foundExpression) {
25    res.send(foundExpression);
26  } else {
27    res.status(404).send();
28  }
29});
30
31// Update an expression
32app.put('/expressions/:id', (req, res, next) => {
33  const expressionIndex = getIndexById(req.params.id, expressions);
34  if (expressionIndex !== -1) {
35    updateElement(req.params.id, req.query, expressions);
36    res.send(expressions[expressionIndex]);
37  } else {
38    res.status(404).send();
39  }
40});
41
42// Create an expression
43app.post('/expressions', (req, res, next) => {
44  const receivedExpression = createElement('expressions', req.query);
45  if (receivedExpression) {
46    expressions.push(receivedExpression);
47    res.status(201).send(receivedExpression);
48  } else {
49    res.status(400).send();
50  }
51});
52
53// Delete an expression
54app.delete('/expressions/:id', (req, res, next) => {
55  const expressionIndex = getIndexById(req.params.id, expressions);
56  if (expressionIndex !== -1) {
57    expressions.splice(expressionIndex, 1);
58    res.status(204).send();
59  } else {
60    res.status(404).send();
61  }
62});
63
64// Get all animals
65app.get('/animals', (req, res, next) => {
66  res.send(animals);
67});
68
69// Get a single animal
70app.get('/animals/:id', (req, res, next) => {
71  const animal = getElementById(req.params.id, animals);
72  if (animal) {
73    res.send(animal);
74  } else {
75    res.status(404).send();
76  }
77});
78
79// Create an animal
80app.post('/animals', (req, res, next) => {
81  const receivedAnimal = createElement('animals', req.query);
82  if (receivedAnimal) {
83    animals.push(receivedAnimal);
84    res.status(201).send(receivedAnimal);
85  } else {
86    res.status(400).send();
87  }
88});
89
90// Update an animal
91app.put('/animals/:id', (req, res, next) => {
92  const animalIndex = getIndexById(req.params.id, animals);
93  if (animalIndex !== -1) {
94    updateElement(req.params.id, req.query, animals);
95    res.send(animals[animalIndex]);
96  } else {
97    res.status(404).send();
98  }
99});
100
101// Delete a single animal
102app.delete('/animals/:id', (req, res, next) => {
103  const animalIndex = getIndexById(req.params.id, animals);
104  if (animalIndex !== -1) {
105    animals.splice(animalIndex, 1);
106    res.status(204).send();
107  } else {
108    res.status(404).send();
109  }
110});
111
112app.listen(PORT, () => {
113  console.log(`Server is listening on ${PORT}`);
114});

1app.get('/', function (req, res) {
2  res.send('Hello World!')
3})
4