server.js

/**
 * This file provided by Facebook is for non-commercial testing and evaluation
 * purposes only. Facebook reserves all rights not expressly granted.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

var fs = require('fs');
var path = require('path');
var express = require('express');
var bodyParser = require('body-parser');
var app = express();

var COMMENTS_FILE = path.join(__dirname, 'comments.json');

app.set('port', (process.env.PORT || 3000));

app.use('/', express.static(path.join(__dirname, 'public')));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: true}));

// Additional middleware which will set headers that we need on each request.
app.use(function(req, res, next) {
 // Set permissive CORS header - this allows this server to be used only as
 // an API server in conjunction with something like webpack-dev-server.
 res.setHeader('Access-Control-Allow-Origin', '*');

 // Disable caching so we'll always get the latest comments.
 res.setHeader('Cache-Control', 'no-cache');
 next();
});

app.get('/api/comments', function(req, res) {
 fs.readFile(COMMENTS_FILE, function(err, data) {
 if (err) {
 console.error(err);
 process.exit(1);
 }
 res.json(JSON.parse(data));
 });
});

app.post('/api/comments', function(req, res) {
 fs.readFile(COMMENTS_FILE, function(err, data) {
 if (err) {
 console.error(err);
 process.exit(1);
 }
 var comments = JSON.parse(data);
 // NOTE: In a real implementation, we would likely rely on a database or
 // some other approach (e.g. UUIDs) to ensure a globally unique id. We'll
 // treat Date.now() as unique-enough for our purposes.
 var newComment = {
 id: Date.now(),
 author: req.body.author,
 text: req.body.text,
 };
 comments.push(newComment);
 fs.writeFile(COMMENTS_FILE, JSON.stringify(comments, null, 4), function(err) {
 if (err) {
 console.error(err);
 process.exit(1);
 }
 res.json(comments);
 });
 });
});


app.listen(app.get('port'), function() {
 console.log('Server started: http://localhost:' + app.get('port') + '/');
});