Where to put 'Access-Control-Allow-Origin', '*' in node js?

Question

Node.js

Making a request from localhost:3000 to localhost:4200 gives an error with the CORS policy. Googled that it is necessary to insert 'Access-Control-Allow-Origin', '*' into the response response, but where exactly?

Answer 1

If you are using express.js, judging by the tags, it is best to do this through the middleware: https://expressjs.com/en/resources/middleware/cors.html