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| "readme": "# type-is\n\n[![NPM Version][npm-image]][npm-url]\n[![NPM Downloads][downloads-image]][downloads-url]\n[![Node.js Version][node-version-image]][node-version-url]\n[![Build Status][travis-image]][travis-url]\n[![Test Coverage][coveralls-image]][coveralls-url]\n\nInfer the content-type of a request.\n\n### Install\n\nThis is a [Node.js](https://nodejs.org/en/) module available through the\n[npm registry](https://www.npmjs.com/). Installation is done using the\n[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):\n\n```sh\n$ npm install type-is\n```\n\n## API\n\n```js\nvar http = require('http')\nvar typeis = require('type-is')\n\nhttp.createServer(function (req, res) {\n var istext = typeis(req, ['text/*'])\n res.end('you ' + (istext ? 'sent' : 'did not send') + ' me text')\n})\n```\n\n### type = typeis(request, types)\n\n`request` is the node HTTP request. `types` is an array of types.\n\n<!-- eslint-disable no-undef -->\n\n```js\n// req.headers.content-type = 'application/json'\n\ntypeis(req, ['json']) // 'json'\ntypeis(req, ['html', 'json']) // 'json'\ntypeis(req, ['application/*']) // 'application/json'\ntypeis(req, ['application/json']) // 'application/json'\n\ntypeis(req, ['html']) // false\n```\n\n### typeis.hasBody(request)\n\nReturns a Boolean if the given `request` has a body, regardless of the\n`Content-Type` header.\n\nHaving a body has no relation to how large the body is (it may be 0 bytes).\nThis is similar to how file existence works. If a body does exist, then this\nindicates that there is data to read from the Node.js request stream.\n\n<!-- eslint-disable no-undef -->\n\n```js\nif (typeis.hasBody(req)) {\n // read the body, since there is one\n\n req.on('data', function (chunk) {\n // ...\n })\n}\n```\n\n### type = typeis.is(mediaType, types)\n\n`mediaType` is the [media type](https://tools.ietf.org/html/rfc6838) string. `types` is an array of types.\n\n<!-- eslint-disable no-undef -->\n\n```js\nvar mediaType = 'application/json'\n\ntypeis.is(mediaType, ['json']) // 'json'\ntypeis.is(mediaType, ['html', 'json']) // 'json'\ntypeis.is(mediaType, ['application/*']) // 'application/json'\ntypeis.is(mediaType, ['application/json']) // 'application/json'\n\ntypeis.is(mediaType, ['html']) // false\n```\n\n### Each type can be:\n\n- An extension name such as `json`. This name will be returned if matched.\n- A mime type such as `application/json`.\n- A mime type with a wildcard such as `*/*` or `*/json` or `application/*`. The full mime type will be returned if matched.\n- 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.\n\n`false` will be returned if no type matches or the content type is invalid.\n\n`null` will be returned if the request does not have a body.\n\n## Examples\n\n### Example body parser\n\n```js\nvar express = require('express')\nvar typeis = require('type-is')\n\nvar app = express()\n\napp.use(function bodyParser (req, res, next) {\n if (!typeis.hasBody(req)) {\n return next()\n }\n\n switch (typeis(req, ['urlencoded', 'json', 'multipart'])) {\n case 'urlencoded':\n // parse urlencoded body\n throw new Error('implement urlencoded body parsing')\n case 'json':\n // parse json body\n throw new Error('implement json body parsing')\n case 'multipart':\n // parse multipart body\n throw new Error('implement multipart body parsing')\n default:\n // 415 error code\n res.statusCode = 415\n res.end()\n break\n }\n})\n```\n\n## License\n\n[MIT](LICENSE)\n\n[npm-image]: https://img.shields.io/npm/v/type-is.svg\n[npm-url]: https://npmjs.org/package/type-is\n[node-version-image]: https://img.shields.io/node/v/type-is.svg\n[node-version-url]: https://nodejs.org/en/download/\n[travis-image]: https://img.shields.io/travis/jshttp/type-is/master.svg\n[travis-url]: https://travis-ci.org/jshttp/type-is\n[coveralls-image]: https://img.shields.io/coveralls/jshttp/type-is/master.svg\n[coveralls-url]: https://coveralls.io/r/jshttp/type-is?branch=master\n[downloads-image]: https://img.shields.io/npm/dm/type-is.svg\n[downloads-url]: https://npmjs.org/package/type-is\n", |
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