A middleware can access and modify the request and response objects. Requests are processed by middleware functions before sent to the handlers.Ī request-response cycle can invoke a series of middleware functions. Express is basically a routing layer composed of many modular processing units called middleware. Thus, each request has a well-defined handler, to which it must be properly routed. For example, submitting a form is handled differently from clicking a like button. When client requests are received, the server doesn't handle all of them alike. Could you explain the concept of middleware in Express.js?Įxpress enables a series of middleware calls.HTTP requests/responses are relayed by Node to Express, whose middleware then do the processing. Express comes with a number of "middleware" software that implement out-of-the-box solutions for typical web app requirements. Express is seen as a lightweight web framework. Thus, Node can be used as the app server for your web application. Node is a JavaScript runtime for server-side execution. In Node, the route handler is a large monolith but Express enables more modular design and maintainable code. provides a thin layer of fundamental Web application features, without obscuring Node.js features that you know and love.įor example, sending an image is complex in Node but easily done in Express.
While it's possible to build a web app or an API service with only Node.js, Express.js simplifies the development process. A typical HTTP request/response call flow with Node and Express.
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