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Infer the content-type of a request.
This is a Node.js module available through the
npm registry. Installation is done using the
npm install
command:
$ npm install type-is
var http = require('http')
var typeis = require('type-is')
http.createServer(function (req, res) {
var istext = typeis(req, ['text/*'])
res.end('you ' + (istext ? 'sent' : 'did not send') + ' me text')
})
request
is the node HTTP request. types
is an array of types.
// req.headers.content-type = 'application/json'
typeis(req, ['json']) // 'json'
typeis(req, ['html', 'json']) // 'json'
typeis(req, ['application/*']) // 'application/json'
typeis(req, ['application/json']) // 'application/json'
typeis(req, ['html']) // false
Returns a Boolean if the given request
has a body, regardless of the
Content-Type
header.
Having a body has no relation to how large the body is (it may be 0 bytes). This is similar to how file existence works. If a body does exist, then this indicates that there is data to read from the Node.js request stream.
if (typeis.hasBody(req)) {
// read the body, since there is one
req.on('data', function (chunk) {
// ...
})
}
mediaType
is the media type string. types
is an array of types.
var mediaType = 'application/json'
typeis.is(mediaType, ['json']) // 'json'
typeis.is(mediaType, ['html', 'json']) // 'json'
typeis.is(mediaType, ['application/*']) // 'application/json'
typeis.is(mediaType, ['application/json']) // 'application/json'
typeis.is(mediaType, ['html']) // false
json
. This name will be returned if matched.application/json
.*/*
or */json
or application/*
. The full mime type will be returned if matched.+json
. This can be combined with a wildcard such as */vnd+json
or application/*+json
. The full mime type will be returned if matched.false
will be returned if no type matches or the content type is invalid.
null
will be returned if the request does not have a body.
var express = require('express')
var typeis = require('type-is')
var app = express()
app.use(function bodyParser (req, res, next) {
if (!typeis.hasBody(req)) {
return next()
}
switch (typeis(req, ['urlencoded', 'json', 'multipart'])) {
case 'urlencoded':
// parse urlencoded body
throw new Error('implement urlencoded body parsing')
case 'json':
// parse json body
throw new Error('implement json body parsing')
case 'multipart':
// parse multipart body
throw new Error('implement multipart body parsing')
default:
// 415 error code
res.statusCode = 415
res.end()
break
}
})