What does middleware and app.use actually mean in Expressjs?

Question

Almost every Express app I see has an app.use statement for middleware but I haven\'t found a clear, concise explanation of what middleware actually is and what

Answer 1

In very basic term if i want to explain it like this i learn this from traversymedia youtube channel express crash course.
ok so middle ware is a function who execute after you make a call to your route like this.

var logger = function(req, res, next){
   console.log('logging...');
   next();
}

app.use(logger);

This logger function execute every time you refresh your page that means you can write anything in it that you required to do after your page get rendered any operation api call, reset things basically anything. and put this middleware before your route function order of middleware is really important or it dons't work