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# raw-body

[![NPM Version][npm-image]][npm-url]
[![NPM Downloads][downloads-image]][downloads-url]
[![Node.js Version][node-version-image]][node-version-url]
[![Build status][github-actions-ci-image]][github-actions-ci-url]
[![Test coverage][coveralls-image]][coveralls-url]

Gets the entire buffer of a stream either as a `Buffer` or a string.
Validates the stream's length against an expected length and maximum limit.
Ideal for parsing request bodies.

## 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 raw-body
```

### TypeScript

This module includes a [TypeScript](https://www.typescriptlang.org/)
declaration file to enable auto complete in compatible editors and type
information for TypeScript projects. This module depends on the Node.js
types, so install `@types/node`:

```sh
$ npm install @types/node
```

## API

```js
var getRawBody = require('raw-body')
```

### getRawBody(stream, [options], [callback])

**Returns a promise if no callback specified and global `Promise` exists.**

Options:

- `length` - The length of the stream.
  If the contents of the stream do not add up to this length,
  an `400` error code is returned.
- `limit` - The byte limit of the body.
  This is the number of bytes or any string format supported by
  [bytes](https://www.npmjs.com/package/bytes),
  for example `1000`, `'500kb'` or `'3mb'`.
  If the body ends up being larger than this limit,
  a `413` error code is returned.
- `encoding` - The encoding to use to decode the body into a string.
  By default, a `Buffer` instance will be returned when no encoding is specified.
  Most likely, you want `utf-8`, so setting `encoding` to `true` will decode as `utf-8`.
  You can use any type of encoding supported by [iconv-lite](https://www.npmjs.org/package/iconv-lite#readme).

You can also pass a string in place of options to just specify the encoding.

If an error occurs, the stream will be paused, everything unpiped,
and you are responsible for correctly disposing the stream.
For HTTP requests, you may need to finish consuming the stream if
you want to keep the socket open for future requests. For streams
that use file descriptors, you should `stream.destroy()` or
`stream.close()` to prevent leaks.

## Errors

This module creates errors depending on the error condition during reading.
The error may be an error from the underlying Node.js implementation, but is
otherwise an error created by this module, which has the following attributes:

* `limit` - the limit in bytes
  * `length` and `expected` - the expected length of the stream
  * `received` - the received bytes
  * `encoding` - the invalid encoding
  * `status` and `statusCode` - the corresponding status code for the error
  * `type` - the error type

### Types

The errors from this module have a `type` property which allows for the programmatic
determination of the type of error returned.

#### encoding.unsupported

This error will occur when the `encoding` option is specified, but the value does
not map to an encoding supported by the [iconv-lite](https://www.npmjs.org/package/iconv-lite#readme)
module.

#### entity.too.large

This error will occur when the `limit` option is specified, but the stream has
an entity that is larger.

#### request.aborted

This error will occur when the request stream is aborted by the client before
reading the body has finished.

#### request.size.invalid

This error will occur when the `length` option is specified, but the stream has
emitted more bytes.

#### stream.encoding.set

This error will occur when the given stream has an encoding set on it, making it
a decoded stream. The stream should not have an encoding set and is expected to
emit `Buffer` objects.

#### stream.not.readable

This error will occur when the given stream is not readable.

## Examples

### Simple Express example

```js
var contentType = require('content-type')
var express = require('express')
var getRawBody = require('raw-body')

var app = express()

app.use(function (req, res, next) {
  getRawBody(req, {
    length: req.headers['content-length'],
    limit: '1mb',
    encoding: contentType.parse(req).parameters.charset
  }, function (err, string) {
    if (err) return next(err)
    req.text = string
    next()
  })
})

// now access req.text
```

### Simple Koa example

```js
var contentType = require('content-type')
var getRawBody = require('raw-body')
var koa = require('koa')

var app = koa()

app.use(function * (next) {
  this.text = yield getRawBody(this.req, {
    length: this.req.headers['content-length'],
    limit: '1mb',
    encoding: contentType.parse(this.req).parameters.charset
  })
  yield next
})

// now access this.text
```

### Using as a promise

To use this library as a promise, simply omit the `callback` and a promise is
returned, provided that a global `Promise` is defined.

```js
var getRawBody = require('raw-body')
var http = require('http')

var server = http.createServer(function (req, res) {
  getRawBody(req)
    .then(function (buf) {
      res.statusCode = 200
      res.end(buf.length + ' bytes submitted')
    })
    .catch(function (err) {
      res.statusCode = 500
      res.end(err.message)
    })
})

server.listen(3000)
```

### Using with TypeScript

```ts
import * as getRawBody from 'raw-body';
import * as http from 'http';

server.listen(3000);
```

## License

[MIT](LICENSE)

[npm-image]: https://img.shields.io/npm/v/raw-body.svg
[npm-url]: https://npmjs.org/package/raw-body
[node-version-image]: https://img.shields.io/node/v/raw-body.svg
[node-version-url]: https://nodejs.org/en/download/
[coveralls-image]: https://img.shields.io/coveralls/stream-utils/raw-body/master.svg
[coveralls-url]: https://coveralls.io/r/stream-utils/raw-body?branch=master
[downloads-image]: https://img.shields.io/npm/dm/raw-body.svg
[downloads-url]: https://npmjs.org/package/raw-body
[github-actions-ci-image]: https://img.shields.io/github/workflow/status/stream-utils/raw-body/ci/master?label=ci
[github-actions-ci-url]: https://github.com/jshttp/stream-utils/raw-body?query=workflow%3Aci

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