axiosとは？

– axiosは、HTTP通信を簡単に行うことができるJavascriptライブラリ
https://github.com/axios/axios
– 主にJsonの取得に利用される

### Features
– Make XMLHttpRequests from the browser
– Make http requests from node.js
– Supports the Promise API
– Intercept request and response
– Transform request and response data
– Cancel requests
– Automatic transforms for JSON data
– Client side support for protecting against XSRF

## サンプル
### npm install
$ npm install axios –save

### index.js
– axios.get(‘${url}’), axios.post(‘${url}’)と実装する
– get, post以外にも、request, delete, head, options, put, patch, getUriなどがある

var express = require('express');
var router = express.Router();

// axiosのインスタンス生成
const axiosBase = require('axios');
const axios = axiosBase.create({
	baseURL = '192.168.33.10:8000',
	headers: {
		'Content-Type' : 'application/json',
		'X-Requested-With': 'XMLHttpRequest'
	},
	responseType: 'json'
});

router.get('/', function(req, res, next){
	axios.get('/title')
	.then(function(response){
		res.render('index', response.data);
	})

	.catch(function(error){
		console.log('Error!! occurred in Backend.')
	});
});

module.exports = router;

### res, err, finally

<script>
		axios.get(${url})
		.then(res => console.log(res.data))
		.catch(err => console.error(err))
		.finally(res => console.log('finally'))
	</script>

XMLHttpRequestを生成せずに処理できるので、確かに使い勝手良さそうです。