diff --git a/example/mock/mocks/trees.json b/example/mock/mocks/trees.json
new file mode 100644
index 0000000..5d27582
--- /dev/null
+++ b/example/mock/mocks/trees.json
@@ -0,0 +1,7 @@
+[
+  { "id": 1, "name": "Conifer", "maxHeight": 115 },
+  { "id": 2, "name": "Eucalyptus", "maxHeight": 210 },
+  { "id": 3, "name": "Ash", "maxHeight": 40 },
+  { "id": 4, "name": "Elder", "maxHeight": 5 },
+  { "id": 5, "name": "Holly", "maxHeight": 10 }
+]
diff --git a/example/mock/mocks/trees.mock.js b/example/mock/mocks/trees.mock.js
index 588259f..70a1f98 100644
--- a/example/mock/mocks/trees.mock.js
+++ b/example/mock/mocks/trees.mock.js
@@ -1,28 +1,21 @@
-const data = [
-  { id: 1, name: 'Conifer', maxHeight: 115 },
-  { id: 2, name: 'Eucalyptus', maxHeight: 210 },
-  { id: 3, name: 'Ash', maxHeight: 40 },
-  { id: 4, name: 'Elder', maxHeight: 5 },
-  { id: 5, name: 'Holly', maxHeight: 10 }
-]
+const data = require('./trees')
 
 module.exports = [
   /* CREATE */
   {
     request: { method: 'POST' },
-    response: {
-      status: 201,
-      location: '/tree/1'
+    response: function (ctx) {
+      data.push(ctx.request.body)
+      this.status = 201
+      this.location = '/tree/1'
     }
   },
   /* READ */
   {
     request: { method: 'GET' },
-    response: {
-      status: 200,
-      body: function (ctx) {
-        return data.filter(tree => tree.maxHeight > Number(ctx.query.tallerThan))
-      }
+    response: function (ctx) {
+      this.status = 200
+      this.body = data.filter(tree => tree.maxHeight > Number(ctx.query.tallerThan || 0))
     }
   },
   /* UPDATE (forbidden on collection)*/
@@ -36,3 +29,6 @@ module.exports = [
     response: { status: 404 }
   }
 ]
+
+// curl -i http://localhost:8000/trees -H 'content-type: application/json'  -d '{"id":6, "name":"Oak", "maxHeight": 100 }'
+// curl -i http://localhost:8000/trees
diff --git a/lib/middleware.js b/lib/middleware.js
index 8a4de5a..68336d5 100644
--- a/lib/middleware.js
+++ b/lib/middleware.js
@@ -86,20 +86,12 @@ function mockResponses (options) {
         mock = mocks.find(mock => !mock.request)
       }
 
-      const mockedReponse = {}
-      /* resolve any functions on the mock */
-      Object.keys(mock.response).forEach(key => {
-        if (t.isFunction(mock.response[key])) {
-          mockedReponse[key] = mock.response[key](ctx)
-        } else {
-          mockedReponse[key] = mock.response[key]
-        }
-      })
-
       if (mock) {
-        Object.assign(ctx.response, mockedReponse)
-        // debug('mocked response', JSON.stringify(mockedReponse))
-        // debug('actual response', JSON.stringify(ctx.response))
+        let mockedResponse = mock.response
+        if (t.isFunction(mock.response)) {
+          mockedResponse = new mock.response(ctx)
+        }
+        Object.assign(ctx.response, mockedResponse)
       }
     } else {
       return next()