In general, one or more programs that are designed to carry out operations for a specific purpose. In the context of Express, a program that uses the Express API running on the Node.js platform. Might also refer to an app object.
Application programming interface. Spell out the abbreviation when it is first used.
A fast, un-opinionated, minimalist web framework for Node.js applications. In general, “Express” is preferred to “Express.js,” though the latter is acceptable.
A multi-platform support library which focuses on asynchronous I/O, primarily developed for use by Node.js.
A function that is invoked by the Express routing layer before the final request handler, and thus sits in the middle between a raw request and the final intended route. A few fine points of terminology around middleware:
var foo = require('middleware') is called requiring or using a Node.js module. Then the statement var mw = foo() typically returns the middleware.app.use(mw) is called adding the middleware to the global processing stack.app.get('/foo', mw, function (req, res) { ... }) is called adding the middleware to the “GET /foo” processing stack.A software platform that is used to build scalable network applications. Node.js uses JavaScript as its scripting language, and achieves high throughput via non-blocking I/O and a single-threaded event loop. See nodejs.org. Usage note: Initially, “Node.js,” thereafter “Node”.
When used as an adjective, hyphenate; for example: “This is open-source software.” See Open-source software on Wikipedia. Note: Although it is common not to hyphenate this term, we are using the standard English rules for hyphenating a compound adjective.
An HTTP request. A client submits an HTTP request message to a server, which returns a response. The request must use one of several request methods such as GET, POST, and so on.
An HTTP response. A server returns an HTTP response message to the client. The response contains completion status information about the request and might also contain requested content in its message body.
Part of a URL that identifies a resource. For example, in http://foo.com/products/id, “/products/id” is the route.
See router in the API reference.