nodejs json data serving

1// load up our shiny new route for users
2const userRoutes = require('./users');
3
4const appRouter = (app, fs) => {
5  // we've added in a default route here that handles empty routes
6  // at the base API url
7  app.get('/', (req, res) => {
8    res.send('welcome to the development api-server');
9  });
10
11  // run our user route module here to complete the wire up
12  userRoutes(app, fs);
13};
14
15// this line is unchanged
16module.exports = appRouter;
17

1const userRoutes = (app, fs) => {
2  // variables
3  const dataPath = './data/users.json';
4
5  // READ
6  app.get('/users', (req, res) => {
7    fs.readFile(dataPath, 'utf8', (err, data) => {
8      if (err) {
9        throw err;
10      }
11
12      res.send(JSON.parse(data));
13    });
14  });
15};
16
17module.exports = userRoutes;
18

1const userRoutes = (app, fs) => {
2  //...unchanged ^^^
3
4  // refactored helper methods
5  const readFile = (
6    callback,
7    returnJson = false,
8    filePath = dataPath,
9    encoding = 'utf8'
10  ) => {
11    fs.readFile(filePath, encoding, (err, data) => {
12      if (err) {
13        throw err;
14      }
15
16      callback(returnJson ? JSON.parse(data) : data);
17    });
18  };
19
20  const writeFile = (
21    fileData,
22    callback,
23    filePath = dataPath,
24    encoding = 'utf8'
25  ) => {
26    fs.writeFile(filePath, fileData, encoding, err => {
27      if (err) {
28        throw err;
29      }
30
31      callback();
32    });
33  };
34
35  // READ
36  // Notice how we can make this 'read' operation much more simple now.
37  app.get('/users', (req, res) => {
38    readFile(data => {
39      res.send(data);
40    }, true);
41  });
42};
43
44module.exports = userRoutes;
45

1{
2  "1": {
3    "name": "king arthur",
4    "password": "password1",
5    "profession": "king",
6    "id": 1
7  },
8  "2": {
9    "name": "rob kendal",
10    "password": "password3",
11    "profession": "code fiddler",
12    "id": 2
13  },
14  "3": {
15    "name": "teresa may",
16    "password": "password2",
17    "profession": "brexit destroyer",
18    "id": 6
19  }
20}
21

1// UPDATE
2app.put('/users/:id', (req, res) => {
3  readFile(data => {
4    // add the new user
5    const userId = req.params['id'];
6    data[userId] = req.body;
7
8    writeFile(JSON.stringify(data, null, 2), () => {
9      res.status(200).send(`users id:${userId} updated`);
10    });
11  }, true);
12});
13

1// load up the express framework and body-parser helper
2const express = require('express');
3const bodyParser = require('body-parser');
4
5// create an instance of express to serve our end points
6const app = express();
7
8// we'll load up node's built in file system helper library here
9// (we'll be using this later to serve our JSON files
10const fs = require('fs');
11
12// configure our express instance with some body-parser settings
13// including handling JSON data
14app.use(bodyParser.json());
15app.use(bodyParser.urlencoded({ extended: true }));
16
17// this is where we'll handle our various routes from
18const routes = require('./routes/routes.js')(app, fs);
19
20// finally, launch our server on port 3001.
21const server = app.listen(3001, () => {
22  console.log('listening on port %s...', server.address().port);
23});
24