Version: v4.0.x

Request

The first parameter of the handler function is Request.

Request is a core Fastify object containing the following fields:

query - the parsed querystring, its format is specified by querystringParser
body - the request payload, see Content-Type Parser for details on what request payloads Fastify natively parses and how to support other content types
params - the params matching the URL
headers - the headers getter and setter
raw - the incoming HTTP request from Node core
server - The Fastify server instance, scoped to the current encapsulation context
id - the request ID
log - the logger instance of the incoming request
ip - the IP address of the incoming request
ips - an array of the IP addresses, ordered from closest to furthest, in the X-Forwarded-For header of the incoming request (only when the trustProxy option is enabled)
hostname - the host of the incoming request (derived from X-Forwarded-Host header when the trustProxy option is enabled). For HTTP/2 compatibility it returns :authority if no host header exists.
protocol - the protocol of the incoming request (https or http)
method - the method of the incoming request
url - the URL of the incoming request
routerMethod - the method defined for the router that is handling the request
routerPath - the path pattern defined for the router that is handling the request
is404 - true if request is being handled by 404 handler, false if it is not
connection - Deprecated, use socket instead. The underlying connection of the incoming request.
socket - the underlying connection of the incoming request
context - A Fastify internal object. You should not use it directly or modify it. It is useful to access one special key:
- context.config - The route config object.

Headers

The request.headers is a getter that returns an Object with the headers of the incoming request. You can set custom headers like this:

request.headers = {
  'foo': 'bar',
  'baz': 'qux'
}

This operation will add to the request headers the new values that can be read calling request.headers.bar. Moreover, you can still access the standard request's headers with the request.raw.headers property.

Note: For performance reason on not found route, you may see that we will add an extra property Symbol('fastify.RequestAcceptVersion') on the headers.

fastify.post('/:params', options, function (request, reply) {
  console.log(request.body)
  console.log(request.query)
  console.log(request.params)
  console.log(request.headers)
  console.log(request.raw)
  console.log(request.server)
  console.log(request.id)
  console.log(request.ip)
  console.log(request.ips)
  console.log(request.hostname)
  console.log(request.protocol)
  console.log(request.url)
  console.log(request.routerMethod)
  console.log(request.routerPath)
  request.log.info('some info')
})

Request​

Headers​

Request

Headers