To fix the CORS policy issue in your Angular application, you can either configure your server to allow CORS requests or use a proxy server.

For the server-side solution, if you’re using Node.js with Express, you can enable CORS by installing the cors package and adding the middleware to your Express app:

const express = require('express');
const cors = require('cors');

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

Alternatively, you can use a proxy server to bypass CORS restrictions during development. Update your Angular proxy.conf.json file to redirect requests to your server:

{
  "/api": {
    "target": "http://localhost:3000",
    "secure": false
  }
}

Then, start your Angular app with the proxy configuration:

ng serve --proxy-config proxy.conf.json