Use MySQL and express to be as a backend.

Steps: (of course you have downloaded the Node.js and MySQL)

1. mkdir weather-server
2. add package.json
3. npm init -y
4. yarn add express mysql cors
5. open project with your editor
6. create index.js file to code backedn content

Dependencies: "cors": "^2.8.5", "express": "^4.17.1", "mysql": "^2.18.1"