Express.js Request

Express.js Request and Response objects are the parameters of the callback function which is used in Express applications.

The express.js request object represents the HTTP request and has properties for the request query string, parameters, body, HTTP headers, and so on.

Syntax:

app.get('/', function (req, res) {
   // --
})

Express.js Request Object Properties

The following table specifies some of the properties associated with request object.

Request Object Methods

Following is a list of some generally used request object methods:

req.accepts (types)

This method is used to check whether the specified content types are acceptable, based on the request's Accept HTTP header field.

Examples:

req.accepts('html');
//=>?html?
req.accepts('text/html');
// => ?text/html?

req.get(field)

This method returns the specified HTTP request header field.

Examples:

req.get('Content-Type');
// => "text/plain"
req.get('content-type');
// => "text/plain"
req.get('Something');
// => undefined

req.is(type)

This method returns true if the incoming request's "Content-Type" HTTP header field matches the MIME type specified by the type parameter.

Examples:

// With Content-Type: text/html; charset=utf-8 req.is('html'); req.is('text/html'); req.is('text/*'); // => true

req.param(name [, defaultValue])

This method is used to fetch the value of param name when present.

Examples:

// ?name=sasha req.param('name') // => "sasha" // POST name=sasha req.param('name') // => "sasha" // /user/sasha for /user/:name req.param('name') // => "sasha"

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