diff --git a/mastodon.go b/mastodon.go
index c704e10..fadf7c7 100644
--- a/mastodon.go
+++ b/mastodon.go
@@ -24,11 +24,17 @@ type Config struct {
 	AccessToken  string
 }
 
+type WriterResetter interface {
+	io.Writer
+	Reset()
+}
+
 // Client is a API client for mastodon.
 type Client struct {
 	http.Client
-	Config    *Config
-	UserAgent string
+	Config     *Config
+	UserAgent  string
+	JSONWriter io.Writer
 }
 
 func (c *Client) doAPI(ctx context.Context, method string, uri string, params interface{}, res interface{}, pg *Pagination) error {
@@ -125,7 +131,15 @@ func (c *Client) doAPI(ctx context.Context, method string, uri string, params in
 			*pg = *pg2
 		}
 	}
-	return json.NewDecoder(resp.Body).Decode(&res)
+
+	if c.JSONWriter != nil {
+		if resetter, ok := c.JSONWriter.(WriterResetter); ok {
+			resetter.Reset()
+		}
+		return json.NewDecoder(io.TeeReader(resp.Body, c.JSONWriter)).Decode(&res)
+	} else {
+		return json.NewDecoder(resp.Body).Decode(&res)
+	}
 }
 
 // NewClient returns a new mastodon API client.
diff --git a/status_test.go b/status_test.go
index 2cac4b8..c520b82 100644
--- a/status_test.go
+++ b/status_test.go
@@ -1,12 +1,14 @@
 package mastodon
 
 import (
+	"bytes"
 	"context"
 	"fmt"
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"os"
+	"strings"
 	"testing"
 )
 
@@ -37,6 +39,110 @@ func TestGetFavourites(t *testing.T) {
 	}
 }
 
+func TestGetFavouritesSavedJSONTwice(t *testing.T) {
+	ourJSON := `[{"content": "foo"}, {"content": "bar"}]`
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintln(w, ourJSON)
+	}))
+	defer ts.Close()
+
+	client := NewClient(&Config{
+		Server:       ts.URL,
+		ClientID:     "foo",
+		ClientSecret: "bar",
+		AccessToken:  "zoo",
+	})
+
+	var buf bytes.Buffer
+	client.JSONWriter = &buf
+
+	favs, err := client.GetFavourites(context.Background(), nil)
+	if err != nil {
+		t.Fatalf("should not be fail: %v", err)
+	}
+	if len(favs) != 2 {
+		t.Fatalf("result should be two: %d", len(favs))
+	}
+	if favs[0].Content != "foo" {
+		t.Fatalf("want %q but %q", "foo", favs[0].Content)
+	}
+	if favs[1].Content != "bar" {
+		t.Fatalf("want %q but %q", "bar", favs[1].Content)
+	}
+
+	// We get a trailing `\n` from the API which we need to trim
+	// off before we compare it with our literal above.
+	theirJSON := strings.TrimSpace(string(buf.Bytes()))
+
+	if theirJSON != ourJSON {
+		t.Fatalf("want %q but %q", ourJSON, theirJSON)
+	}
+
+	// Now we call the API again to see if we get the same or doubled JSON.
+
+	favs, err = client.GetFavourites(context.Background(), nil)
+	if err != nil {
+		t.Fatalf("should not be fail: %v", err)
+	}
+	if len(favs) != 2 {
+		t.Fatalf("result should be two: %d", len(favs))
+	}
+	if favs[0].Content != "foo" {
+		t.Fatalf("want %q but %q", "foo", favs[0].Content)
+	}
+	if favs[1].Content != "bar" {
+		t.Fatalf("want %q but %q", "bar", favs[1].Content)
+	}
+
+	// We get a trailing `\n` from the API which we need to trim
+	// off before we compare it with our literal above.
+	theirJSON = strings.TrimSpace(string(buf.Bytes()))
+
+	if theirJSON != ourJSON {
+		t.Fatalf("want %q but %q", ourJSON, theirJSON)
+	}
+}
+
+func TestGetFavouritesSavedJSON(t *testing.T) {
+	ourJSON := `[{"content": "foo"}, {"content": "bar"}]`
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintln(w, ourJSON)
+	}))
+	defer ts.Close()
+
+	client := NewClient(&Config{
+		Server:       ts.URL,
+		ClientID:     "foo",
+		ClientSecret: "bar",
+		AccessToken:  "zoo",
+	})
+
+	var buf bytes.Buffer
+	client.JSONWriter = &buf
+
+	favs, err := client.GetFavourites(context.Background(), nil)
+	if err != nil {
+		t.Fatalf("should not be fail: %v", err)
+	}
+	if len(favs) != 2 {
+		t.Fatalf("result should be two: %d", len(favs))
+	}
+	if favs[0].Content != "foo" {
+		t.Fatalf("want %q but %q", "foo", favs[0].Content)
+	}
+	if favs[1].Content != "bar" {
+		t.Fatalf("want %q but %q", "bar", favs[1].Content)
+	}
+
+	// We get a trailing `\n` from the API which we need to trim
+	// off before we compare it with our literal above.
+	theirJSON := strings.TrimSpace(string(buf.Bytes()))
+
+	if theirJSON != ourJSON {
+		t.Fatalf("want %q but %q", ourJSON, theirJSON)
+	}
+}
+
 func TestGetBookmarks(t *testing.T) {
 	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		fmt.Fprintln(w, `[{"content": "foo"}, {"content": "bar"}]`)