stream-utils
raw-body
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 module available through the
npm registry. Installation is done using the
npm install command:
$ npm install raw-bodyTypeScript
This module includes a TypeScript
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:
$ npm install @types/nodeAPI
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, an400error code is returned.limit- The byte limit of the body. This is the number of bytes or any string format supported by bytes, for example1000,'500kb'or'3mb'. If the body ends up being larger than this limit, a413error code is returned.encoding- The encoding to use to decode the body into a string. By default, aBufferinstance will be returned when no encoding is specified. Most likely, you wantutf-8, so settingencodingtotruewill decode asutf-8. You can use any type of encoding supported by iconv-lite.
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 byteslengthandexpected- the expected length of the streamreceived- the received bytesencoding- the invalid encodingstatusandstatusCode- the corresponding status code for the errortype- 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
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
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.textSimple Koa example
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.textUsing 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.
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
import * as getRawBody from 'raw-body';
import * as http from 'http';
const server = http.createServer((req, res) => {
getRawBody(req)
.then((buf) => {
res.statusCode = 200;
res.end(buf.length + ' bytes submitted');
})
.catch((err) => {
res.statusCode = err.statusCode;
res.end(err.message);
});
});
server.listen(3000);