Express is the default HTTPHyperText Transfer Protocol — the protocol browsers use to request and receive web pages. layer for NodeNode.js — JavaScript on the server via an event-driven runtime built on V8. APIs — routing, middlewareSoftware between applications and lower-level systems — handles integration, messaging, or shared services., and request/response helpers in a few lines. It sits under NestJS, early Meteor, and countless RESTRepresentational State Transfer — a style for web APIs using HTTP methods and resource URLs. services. Typical use: `app.get('/users', ...)` with JSONJavaScript Object Notation — a lightweight text format for structured data exchange on the web. middlewareSoftware between applications and lower-level systems — handles integration, messaging, or shared services., session cookies, and static file serving.

Express became the de facto NodeNode.js — JavaScript on the server via an event-driven runtime built on V8. web framework and defined the middlewareSoftware between applications and lower-level systems — handles integration, messaging, or shared services. pattern for JS servers.

It made NodeNode.js — JavaScript on the server via an event-driven runtime built on V8. practical for HTTPHyperText Transfer Protocol — the protocol browsers use to request and receive web pages. APIs when the runtime was still new and unproven for production.