Using bodyParser type option with content-type header

I need to use bodyParser.raw parser only when req.headers.content-type is ‘raw’ (because app must handle many requests with different types). But when i define this header in postman and then trying to use bodyParser like this i’m getting an empty req.body:

app.use(bodyParser.raw({
  type: 'raw',
  limit: config.proxy.bodyparserlimit
}))

app.use(bodyParser.json({
  limit: config.proxy.bodyparserlimit
}))

app.use(bodyParser.urlencoded({
  limit: config.proxy.bodyparserlimit,
  extended: true
}))

app.post('/', upload.any(), function (req, res) {
  var requestData = req.body

  requestData.contentType = req.headers['content-type']
}

Seems like bodyParser trying to find type field in req.body, but there is nothing there. So how can I use type option with Content-Type header?

[dougwilson]

Hey @getupandgo, it’s no problem 😃 As for your type: 'raw' issue, this is because body-parser will take what you gave as type and hands it to type-is module (see docs https://github.com/expressjs/body-parser#type). If you give it a simple string, it looks like what the MIME type is for that file extension. In this case, it tries to use whatever the file .raw is, which does not exist, and ends up never matching any requests at all.

If you really want to match the header Content-Type: raw, you should just use a function and do it manually. Example:

app.use(bodyParser.raw({
  type: function (req) { return req.headers['content-type'] === 'raw' },
  limit: config.proxy.bodyparserlimit
}))

[dougwilson]

Awesome, good to hear!