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In an Express.js application, what is the purpose of middleware and how it can be used?Middleware is a special type of function that can be used to modify the request and response objects. It can be used through the "app.use()" function.Middleware is a Regular Expression and/or function that can be used to validate user input and then allow or reject a HTTP request. It can be used through the "app.engine()" function.Middleware is a special type of function that handles errors in an Express.js application. It can be added to the application using the "app.error()" function.Middleware is a function to log or modify information about incoming HTTP requests in an Express.js application. It can be added to the application using the "app.log()" or "app.use()" functions.

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In an Express.js application, what is the purpose of middleware and how it can be used?Middleware is a special type of function that can be used to modify the request and response objects. It can be used through the "app.use()" function.Middleware is a Regular Expression and/or function that can be used to validate user input and then allow or reject a HTTP request. It can be used through the "app.engine()" function.Middleware is a special type of function that handles errors in an Express.js application. It can be added to the application using the "app.error()" function.Middleware is a function to log or modify information about incoming HTTP requests in an Express.js application. It can be added to the application using the "app.log()" or "app.use()" functions.

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