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Stubbr: Quick stubs for ASP.NET Core

Building back-end services sometimes require stubbing of stuff. Stubbr is middleware for ASP.NET Core that provide stubs from given pre-defined request endpoints configuration. Stubs can be sourced from local disk or a remote location. The stub configuration system is built ontop of ASP.NET Core's configuration model, having support for JSON, XML and INI files out of the box.


Stubbr can be installed from Nuget using the following command:

Install-Package Stubbr

Or you can also manually add Stubbr to the project.json file

  "dependencies": {
     "Stubbr": "0.0.1"


Using Stubbr should be easy and simple. All it requires is some configuration about the request and details on the response that must be provided. Given the following configuration within mystubs-config.json:

  "Stubs": {
    "GET /foo/bar": {
      "Headers": {
        "X-Header-1": "X-Header-1-Value",
        "Content-Type": "application/json"
      "Body": "./stubs/response1.json",
      "Status": 200
    "POST /api/foo/bar/baz": {
      "Headers": {
        "X-Header-3": "X-Header-3-Value",
        "Content-Type": "application/xml"
      "Body": "./stubs/response2.xml",
      "Status": 201

Note that the Body can be a remote URI as well.

Simply load the configuration into the configuration system of ASP.NET Core:

public Startup(IHostingEnvironment env)
  var builder = new ConfigurationBuilder()
  Configuration = builder.Build();

public IConfigurationRoot Configuration { get; }

Following the Add/Use convention pattern in ASP.NET Core, we add Stubbr to the IServiceCollection, passing in the configuration section and then registering it within the pipeline:

public void ConfigureServices(IServiceCollection services)

public void Configure(IApplicationBuilder app)

Thats it - now when you request these configured endpoints, the stub responses will be returned.