Much has been said about the Node.js’s great performance so I wanted to test out how it compares to an ASP.NET Web Api backend.I created a simple server for both of the platforms which accepts a POST-request and then responds back with the request’s body.

Update 24.6.2012: Updated tests with some tweaks.

The Node.js and ASP.NET Web Api implementations

Here’s the Node.js code:

var express = require('express')
    , app = express.createServer();


app.post('/', function(req, res){


And here’s the ASP.NET Web Api controller:

    public class ValuesController : ApiController
        // POST /api/values
        public Task<string> Post()
            return this.ControllerContext.Request.Content.ReadAsStringAsync();


I used Apache’s ab tool to test the performance of the platforms. The benchmark was run with the following settings:

  • Total number of requests: 100 000
  • Concurrency: 100

The benchmark (test.dat) contained a simple JSON, taken from Wikipedia.

     "firstName": "John",
     "lastName" : "Smith",
     "age"      : 25,
     "address"  :
         "streetAddress": "21 2nd Street",
         "city"         : "New York",
         "state"        : "NY",
         "postalCode"   : "10021"
           "type"  : "home",
           "number": "212 555-1234"
           "type"  : "fax",
           "number": "646 555-4567"

Here’s the whole command which was used to run the performance test:

ab -n 100000 -c 100 -p .test.dat -T 'application/json; charset=utf-8' http://localhost/

The performance test was run 3 times and the best result for each platform was selected. The performance difference between the test runs was minimal.

Test Environment

The benchmark was run on a Windows Server 2008 R2, hosted on an c1.medium Amazon EC2 –instance:


Specs of the instance

  • 1.7GB memory
  • 5 EC2 Compute Units (2 virtual cores)


  • Node.js: 0.6.17
  • ASP.NET Web Api: The official beta release.
  • IIS: 7

Both the Node and IIS –servers were run with their out-of-the-box settings.

Benchmark Results


 Web ApiNode.js
Time taken (in s)89.9541.65
Requests per second1111.692400.89
Time per request (in ms)89.9541.65
Failed requests00


The out-of-the-box performance of the Node.js seems to be better than the performance of the ASP.NET Web Api + IIS7. Tweaking the IIS7’s settings could make the ASP.NET Web Api perform better but for this test the default settings of IIS7 were used.