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+# type-is
+
+[![NPM Version][npm-image]][npm-url]
+[![NPM Downloads][downloads-image]][downloads-url]
+[![Node.js Version][node-version-image]][node-version-url]
+[![Build Status][travis-image]][travis-url]
+[![Test Coverage][coveralls-image]][coveralls-url]
+
+Infer the content-type of a request.
+
+### Install
+
+This is a [Node.js](https://nodejs.org/en/) module available through the
+[npm registry](https://www.npmjs.com/). Installation is done using the
+[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
+
+```sh
+$ npm install type-is
+```
+
+## API
+
+```js
+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')
+})
+```
+
+### type = typeis(request, types)
+
+`request` is the node HTTP request. `types` is an array of types.
+
+<!-- eslint-disable no-undef -->
+
+```js
+// 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
+```
+
+### typeis.hasBody(request)
+
+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.
+
+<!-- eslint-disable no-undef -->
+
+```js
+if (typeis.hasBody(req)) {
+ // read the body, since there is one
+
+ req.on('data', function (chunk) {
+ // ...
+ })
+}
+```
+
+### type = typeis.is(mediaType, types)
+
+`mediaType` is the [media type](https://tools.ietf.org/html/rfc6838) string. `types` is an array of types.
+
+<!-- eslint-disable no-undef -->
+
+```js
+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
+```
+
+### Each type can be:
+
+- An extension name such as `json`. This name will be returned if matched.
+- A mime type such as `application/json`.
+- A mime type with a wildcard such as `*/*` or `*/json` or `application/*`. The full mime type will be returned if matched.
+- A suffix such as `+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.
+
+## Examples
+
+### Example body parser
+
+```js
+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
+ }
+})
+```
+
+## License
+
+[MIT](LICENSE)
+
+[npm-image]: https://img.shields.io/npm/v/type-is.svg
+[npm-url]: https://npmjs.org/package/type-is
+[node-version-image]: https://img.shields.io/node/v/type-is.svg
+[node-version-url]: https://nodejs.org/en/download/
+[travis-image]: https://img.shields.io/travis/jshttp/type-is/master.svg
+[travis-url]: https://travis-ci.org/jshttp/type-is
+[coveralls-image]: https://img.shields.io/coveralls/jshttp/type-is/master.svg
+[coveralls-url]: https://coveralls.io/r/jshttp/type-is?branch=master
+[downloads-image]: https://img.shields.io/npm/dm/type-is.svg
+[downloads-url]: https://npmjs.org/package/type-is