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# body-parser [![NPM Version][npm-image]][npm-url] [![NPM Downloads][downloads-image]][downloads-url] [![Build Status][travis-image]][travis-url] [![Test Coverage][coveralls-image]][coveralls-url] [![Gratipay][gratipay-image]][gratipay-url] Node.js body parsing middleware. _This does not handle multipart bodies_, due to their complex and typically large nature. For multipart bodies, you may be interested in the following modules: * [busboy](https://www.npmjs.org/package/busboy#readme) and [connect-busboy](https://www.npmjs.org/package/connect-busboy#readme) * [multiparty](https://www.npmjs.org/package/multiparty#readme) and [connect-multiparty](https://www.npmjs.org/package/connect-multiparty#readme) * [formidable](https://www.npmjs.org/package/formidable#readme) * [multer](https://www.npmjs.org/package/multer#readme) This module provides the following parsers: * [JSON body parser](#bodyparserjsonoptions) * [Raw body parser](#bodyparserrawoptions) * [Text body parser](#bodyparsertextoptions) * [URL-encoded form body parser](#bodyparserurlencodedoptions) Other body parsers you might be interested in: - [body](https://www.npmjs.org/package/body#readme) - [co-body](https://www.npmjs.org/package/co-body#readme) ## Installation ```sh $ npm install body-parser ``` ## API ```js var bodyParser = require('body-parser') ``` The `bodyParser` object exposes various factories to create middlewares. All middlewares will populate the `req.body` property with the parsed body, or an empty object (`{}`) if there was no body to parse (or an error was returned). The various errors returned by this module are described in the [errors section](#errors). ### bodyParser.json(options) Returns middleware that only parses `json`. This parser accepts any Unicode encoding of the body and supports automatic inflation of `gzip` and `deflate` encodings. A new `body` object containing the parsed data is populated on the `request` object after the middleware (i.e. `req.body`). #### Options The `json` function takes an option `options` object that may contain any of the following keys: ##### inflate When set to `true`, then deflated (compressed) bodies will be inflated; when `false`, deflated bodies are rejected. Defaults to `true`. ##### limit Controls the maximum request body size. If this is a number, then the value specifies the number of bytes; if it is a string, the value is passed to the [bytes](https://www.npmjs.com/package/bytes) library for parsing. Defaults to `'100kb'`. ##### reviver The `reviver` option is passed directly to `JSON.parse` as the second argument. You can find more information on this argument [in the MDN documentation about JSON.parse](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse#Example.3A_Using_the_reviver_parameter). ##### strict When set to `true`, will only accept arrays and objects; when `false` will accept anything `JSON.parse` accepts. Defaults to `true`. ##### type The `type` option is used to determine what media type the middleware will parse. This option can be a function or a string. If a string, `type` option is passed directly to the [type-is](https://www.npmjs.org/package/type-is#readme) library and this can be an extension name (like `json`), a mime type (like `application/json`), or a mime type with a wildcard (like `*/*` or `*/json`). If a function, the `type` option is called as `fn(req)` and the request is parsed if it returns a truthy value. Defaults to `application/json`. ##### verify The `verify` option, if supplied, is called as `verify(req, res, buf, encoding)`, where `buf` is a `Buffer` of the raw request body and `encoding` is the encoding of the request. The parsing can be aborted by throwing an error. ### bodyParser.raw(options) Returns middleware that parses all bodies as a `Buffer`. This parser supports automatic inflation of `gzip` and `deflate` encodings. A new `body` object containing the parsed data is populated on the `request` object after the middleware (i.e. `req.body`). This will be a `Buffer` object of the body. #### Options The `raw` function takes an option `options` object that may contain any of the following keys: ##### inflate When set to `true`, then deflated (compressed) bodies will be inflated; when `false`, deflated bodies are rejected. Defaults to `true`. ##### limit Controls the maximum request body size. If this is a number, then the value specifies the number of bytes; if it is a string, the value is passed to the [bytes](https://www.npmjs.com/package/bytes) library for parsing. Defaults to `'100kb'`. ##### type The `type` option is used to determine what media type the middleware will parse. This option can be a function or a string. If a string, `type` option is passed directly to the [type-is](https://www.npmjs.org/package/type-is#readme) library and this can be an extension name (like `bin`), a mime type (like `application/octet-stream`), or a mime type with a wildcard (like `*/*` or `application/*`). If a function, the `type` option is called as `fn(req)` and the request is parsed if it returns a truthy value. Defaults to `application/octet-stream`. ##### verify The `verify` option, if supplied, is called as `verify(req, res, buf, encoding)`, where `buf` is a `Buffer` of the raw request body and `encoding` is the encoding of the request. The parsing can be aborted by throwing an error. ### bodyParser.text(options) Returns middleware that parses all bodies as a string. This parser supports automatic inflation of `gzip` and `deflate` encodings. A new `body` string containing the parsed data is populated on the `request` object after the middleware (i.e. `req.body`). This will be a string of the body. #### Options The `text` function takes an option `options` object that may contain any of the following keys: ##### defaultCharset Specify the default character set for the text content if the charset is not specified in the `Content-Type` header of the request. Defaults to `utf-8`. ##### inflate When set to `true`, then deflated (compressed) bodies will be inflated; when `false`, deflated bodies are rejected. Defaults to `true`. ##### limit Controls the maximum request body size. If this is a number, then the value specifies the number of bytes; if it is a string, the value is passed to the [bytes](https://www.npmjs.com/package/bytes) library for parsing. Defaults to `'100kb'`. ##### type The `type` option is used to determine what media type the middleware will parse. This option can be a function or a string. If a string, `type` option is passed directly to the [type-is](https://www.npmjs.org/package/type-is#readme) library and this can be an extension name (like `txt`), a mime type (like `text/plain`), or a mime type with a wildcard (like `*/*` or `text/*`). If a function, the `type` option is called as `fn(req)` and the request is parsed if it returns a truthy value. Defaults to `text/plain`. ##### verify The `verify` option, if supplied, is called as `verify(req, res, buf, encoding)`, where `buf` is a `Buffer` of the raw request body and `encoding` is the encoding of the request. The parsing can be aborted by throwing an error. ### bodyParser.urlencoded(options) Returns middleware that only parses `urlencoded` bodies. This parser accepts only UTF-8 encoding of the body and supports automatic inflation of `gzip` and `deflate` encodings. A new `body` object containing the parsed data is populated on the `request` object after the middleware (i.e. `req.body`). This object will contain key-value pairs, where the value can be a string or array (when `extended` is `false`), or any type (when `extended` is `true`). #### Options The `urlencoded` function takes an option `options` object that may contain any of the following keys: ##### extended The `extended` option allows to choose between parsing the URL-encoded data with the `querystring` library (when `false`) or th