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.

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