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Я получаю ошибку cors

 const api = getAPI(); // HERE's ERROR  function getAPI() {  return (fetch('http://localhost:3000')); // returns a promise }  

 register.html:1 Access to fetch at 'http://localhost:3000/' from origin 'null' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled. register.js:103 GET http://localhost:3000/ net::ERR_FAILED 200 getAPI @ register.js:103 register @ register.js:97 register.js:103 Uncaught (in promise) TypeError: Failed to fetch  at getAPI (register.js:103)  at HTMLButtonElement.register (register.js:97)  

Вот мое главное приложение, app.js (api)

 const express = require('express') const app = express() const port = 3000 const mysqlConObj = require('./config/mysql.js') const db = mysqlConObj.init() const cors = require('cors'); mysqlConObj.open(db) app.get('/', (req, res) =gt; res.send('MyAPIName')) app.listen(port, () =gt; console.log('Server Running. . .')) app.use(cors({origin: "http://localhost:3000", credentials: true})); // CORS SETUP  

Кроме того, это не работает. (Оба из

 app.use(cors({origin: "http://localhost:3000", credentials: true}));  

и

 app.use(function(req, res, next) {  res.header("Access-Control-Allow-Credentials", true);  res.header("Access-Control-Allow-Origin", "http://localhost:3000");  res.header("Access-Control-Allow-Headers",  "Origin, X-Requested-With, Content-Type, Accept, Authorization, X-HTTP-Method-Override, Set-Cookie, Cookie"); // select only the ones you need  res.header("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");   next(); });  

не работает.)

Я уже занимаюсь настройкой cors.

Кто-нибудь может сказать мне, что случилось?

Я хорошо импортировал КОРС.

Спасибо за совет