Node.js Web Apps With Express
Introduction
Express is a minimal and flexible Node.js web application framework, providing a robust set of features for building web applications.
The official website of Express is expressjs.com. The source can be found on GitHub.
Syntax
- app.get(path [, middleware], callback[, callback...])
- app.put(path [, middleware], callback[, callback...])
- app.post(path [, middleware], callback[, callback...])
- app['delete'](path [, middleware], callback[, callback...])
- app.use(path [, middleware], callback[, callback...])
- app.use(callback)
Parameters
| Parameter | Details |
|---|---|
path | Specifies the path portion or the URL that the given callback will handle. |
middleware | One or more functions which will be called before the callback. Essentially a chaining of multiple callback functions. Useful for more specific handling for example authorization or error handling. |
callback | A function that will be used to handle requests to the specified path. It will be called like callback(request, response, next), where request, response, and next are described below. |
callback request | An object encapsulating details about the HTTP request that the callback is being called to handle. |
response | An object that is used to specify how the server should respond to the request. |
next | A callback that passes control on to the next matching route. It accepts an optional error object. |
