jsan-body-parser

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Node.js body parsing middleware for jsan.

Parse incoming request bodies in a middleware before your handlers, available under the req.body property.

Installation

$ npm install jsan-body-parser

API

var jsanBodyParser = require('jsan-body-parser')

jsanBodyParser(options)

Returns middleware that parses jsan. 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 jsan 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 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.

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 library and this can be an extension name (like jsan), a mime type (like application/jsan), or a mime type with a wildcard (like */* or */jsan). 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/jsan.

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.

Errors

The middleware provided by this module create errors depending on the error condition during parsing. The errors will typically have a status property that contains the suggested HTTP response code and a body property containing the read body, if available.

The following are the common errors emitted, though any error can come through for various reasons.

content encoding unsupported

This error will occur when the request had a Content-Encoding header that contained an encoding but the "inflation" option was set to false. The status property is set to 415.

request aborted

This error will occur when the request is aborted by the client before reading the body has finished. The received property will be set to the number of bytes received before the request was aborted and the expected property is set to the number of expected bytes. The status property is set to 400.

request entity too large

This error will occur when the request body's size is larger than the "limit" option. The limit property will be set to the byte limit and the length property will be set to the request body's length. The status property is set to 413.

request size did not match content length

This error will occur when the request's length did not match the length from the Content-Length header. This typically occurs when the request is malformed, typically when the Content-Length header was calculated based on characters instead of bytes. The status property is set to 400.

stream encoding should not be set

This error will occur when something called the req.setEncoding method prior to this middleware. This module operates directly on bytes only and you cannot call req.setEncoding when using this module. The status property is set to 500.

unsupported charset "BOGUS"

This error will occur when the request had a charset parameter in the Content-Type header, but the iconv-lite module does not support it OR the parser does not support it. The charset is contained in the message as well as in the charset property. The status property is set to 415.

unsupported content encoding "bogus"

This error will occur when the request had a Content-Encoding header that contained an unsupported encoding. The encoding is contained in the message as well as in the encoding property. The status property is set to 415.

Examples

Express/Connect top-level generic

This example demonstrates adding a generic JSON and URL-encoded parser as a top-level middleware, which will parse the bodies of all incoming requests. This is the simplest setup.

var express = require('express')
var bodyParser = require('body-parser')
var jsanBodyParser = require('jsan-body-parser')

var app = express()

// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }))

// parse application/json
app.use(bodyParser.json())

// parse application/jsan
app.use(jsanBodyParser())

app.use(function (req, res) {
  res.setHeader('Content-Type', 'text/plain')
  res.write('you posted:\n')
  res.end(JSON.stringify(req.body, null, 2))
})

Express route-specific

This example demonstrates adding body parsers specifically to the routes that need them. In general, this is the most recommended way to use body-parser with Express.

var express = require('express')
var bodyParser = require('body-parser')
var jsanBodyParser = require('jsan-body-parser')

var app = express()

// create application/jsan parser
var jsanParser = jsanBodyParser()

// create application/x-www-form-urlencoded parser
var urlencodedParser = bodyParser.urlencoded({ extended: false })

// POST /login gets urlencoded bodies
app.post('/login', urlencodedParser, function (req, res) {
  if (!req.body) return res.sendStatus(400)
  res.send('welcome, ' + req.body.username)
})

// POST /api/users gets jsan bodies
app.post('/api/users', jsanParser, function (req, res) {
  if (!req.body) return res.sendStatus(400)
  // create user in req.body
})

Change accepted type for parsers

All the parsers accept a type option which allows you to change the Content-Type that the middleware will parse.

// drop-in replacement of app.use(bodyParser.json())
app.use(jsanBodyParser({ type: 'application/json' }))

License

MIT