Node.js: how to limit the HTTP request size and upload file size?

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Just an update (07-2014), as I’m not able to add comments:

As correctly noted above, newer Express versions have deprecated the use of the limit middleware and now provide it as a built-in option for the BodyParser middleware:

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

   var app = express()
   app.use(bodyParser.json({ limit: '5mb' }))

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