Creating Middleware in Express (Important Steps)

example.js

// Will create a middleware called logger 
// middleware is a called function requiring inputs of (req,res,next) that runs with every http request (if global app middleware)
// next MUST be called to continue on with the http request

const logger = (req,res,next) => {
  req.hello = 'Hello World';
  console.log('Middleware ran');
  next();
};

// because we applied this middleware to the entire express app, it will run with every http request
app.use(logger)
 

// You can set custom middleware on specific routes (eg auth protection middleware)