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Express.js is a minimalist web framework for Node.js that helps developers quickly create powerful web applications and APIs. It offers a variety of features that simplify routing and handling HTTP requests, thereby accelerating development.
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Express.js is a minimalist web framework for Node.js providing routing, middleware, and HTTP helpers for APIs and web applications.
TJ Holowaychuk released Express in 2010; it became a common foundation for many Node.js web frameworks and now belongs to the OpenJS Foundation.
An application registers middleware in order and maps HTTP methods and paths to handlers. Request and response wrap Node HTTP objects; middleware handles parsing, authentication, logging, or errors. Template engines and external packages extend the small core.
Functions process request and response sequentially or pass control onward.
Methods and paths connect HTTP requests with application logic.
A small core is extended through specialized packages and custom components.
Express fits lean APIs, prototypes, and custom Node.js servers. Its flexibility transfers responsibility for architecture, validation, async errors, security, observability, dependency selection, and performance to the team.
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