index.js

var request = require('request');
var restify = require('restify');

const API_URL = 'http://api.laifudao.com/open/xiaohua.json';

var app = restify.createServer({
  name: 'jokes'
});

app.get('/joke', (req, res) => {
  request(API_URL, (err, response, body) => {
    if (err) {
      console.error(err);
      return res.send({
        type: 'Error',
        data: [{
          code: 102,
          message: err.toString()
        }]
      });
    }

    if (response.statusCode === 200) {
      body = body.trim().replace(/\s/g, '');
      var jokes = JSON.parse(body);
      var joke = jokes[Math.floor(Math.random() * jokes.length)];
      
      return res.send({
        type: 'Text',
        data: [joke.content.trim().replace(/"/g, '\"').replace(/<br\/>/g, '')]
      });
    } else {
      return res.send({
        type: 'Error',
        data: [{
          code: 601,
          message: body
        }]
      });
    }
  });
});

app.listen(3000, () => {
  console.log('listening at 3000');
});