CORS express not working predictably

Question

I am trying to allow access from everywhere.

I have tried using app middleware:

app.use(function (req, res, next) {
  res.setHeader(\"Access-Control-Allo         


        

Answer 1

First install, the "cors" package from npm: npm i -S cors

Then enable it in your express server.

var express = require('express'),
  cors = require('cors');

const app = express();
app.use(cors());

...