api.js

let express = require('express');
let bodyParser = require('body-parser');
let app = express();
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(function (req, res, next) {
    res.set({
        'Access-Control-Allow-Origin': 'http://localhost:3000',
        'Access-Control-Allow-Credentials': true,
        'Access-Control-Allow-Methods': 'GET,POST, PUT, DELETE, OPTIONS',
        'Access-Control-Allow-Headers': 'Content-Type,name'
    });
    if (req.method === 'OPTIONS') {
        return res.sendStatus(200);
    }
    next();
});
app.get('/get', function (req, res) {
    res.json(req.query);
});
app.post('/post', function (req, res) {
    res.json(req.body);
});
app.post('/post_timeout', function (req, res) {
    let { timeout } = req.query;
    console.log(req.query);

    if (timeout) {
        timeout = parseInt(timeout);
    } else {
        timeout = 0;
    }
    setTimeout(function () {
        res.json(req.body);
    }, timeout);
});
app.post('/post_status', function (req, res) {
    let { code } = req.query;
    if (code) {
        code = parseInt(code);
    } else {
        code = 200;
    }
    res.statusCode = code;
    res.json(req.body);
});
app.listen(8080);