How to send a JSON object from NODE JS to JQUERY

I am develoing a weather application using NodeJS server which sends a city from html to NodeJS using /POST but I want to send JSON object back to HTML/JQUERY. I've tried working with cookies but it Did'nt worked out. Errors like "module not found" or "cannot import" are common, even a shows "GET http://localhost:9000/ 404 (Not Found)".

Thanks for your Kind Help.