node package manager


Mock out your API server for testing.


A flexible and powerful stand-in API server.

This server is meant to be booted quickly (for example, inside a test suite) in a Node.js process.


From the command-line:

./node_modules/.bin/mock-api-server --port PORT

To boot once for a test:

var MockApi = require('mock-api-server');
var api = new MockApi({"port": 7000});
api.start(function(err) {
  // ... do stuff ... 

To connect to an existing server:

var MockApi = require('mock-api-server');
var api = new MockApi({"port": 7000});
api.reset(); // Or whatever you want to do. 

See test/ for more detailed examples.

If you are using Mocha, you can also boot the server in a before clause. It's also possible to boot the server once at the beginning of the test suite.


The MockApi supports the following options:

Option Description
`port` The IP port on which the mock server listens. Must be specified.
`logToConsole` If `true`, requests will be logged to the console. Default: `false`.
`logToFile` If set to a filename, requests will be logged to the specified file. If `null` or omitted, no file logging is done.

Canned Responses

Canned responses live in your project's test/mock-api directory. This directory and its subdirectories has the same structure as your API. For example, to serve an endpoint /v2/foobizzle, populate the file test/mock-api/GET/v2/foobizzle.json.

Responding to HTTP Methods

Files in the test/mock-api/GET subdirectory are used for GET requests. Files in test/mock-api/PUT subdirectory are used for PUT requests, and so forth.

Responding to Query Parameters

If you have these three files:


then mock-api-server will serve the third one when type=search and s=foo are provided as query parameters. If only type=search is provided, the second one will be served--mock-api-server will take the most specific matching file.

* can be used to match zero or more characters. For example, the following file:


Will match requests with a query parameter type containing a value "search" or "index,search" or "search,index".

Note that most shells will interpret ?, *, and &, so to create these files, you will have to backslash them. For example:

$ touch test/mock-api/GET/v2/foobizzle.json\?type=\*search\*\&s=foo

Live Responses

You can tell the API server to respond to a particular request like so:

api.respondTo('/foo/bar').with({status: 'OK'});

This will be active until the next time api.reset() is called.

You can modify an existing response with:

api.respondTo('/foo/bar').byReplacing('[1].baz').with([ 76 ]);