How to connect json file to express server?

Question

JavaScript

Hello!
Help, please, to understand.
There is a vue application, a local Express server and a json file with data.
json data must be loaded into the vue components from the server, then the data is edited in the application and you need to configure the ability to generate a new json file with its entry on the server.
How to host a json file locally and set up its connection with Express? How can I generate a new json file and send it to the server?