diff --git a/editor.go b/editor.go
index 3d70aa4..5d1552a 100644
--- a/editor.go
+++ b/editor.go
@@ -11,6 +11,7 @@ import (
 	"net/url"
 	"strings"
 
+	"github.com/gorilla/websocket"
 	"github.com/microcosm-cc/bluemonday"
 	"go.goblog.app/app/pkgs/contenttype"
 	"gopkg.in/yaml.v3"
@@ -39,13 +40,16 @@ func (a *goBlog) serveEditorPreview(w http.ResponseWriter, r *http.Request) {
 		if err != nil {
 			break
 		}
+		if mt != websocket.TextMessage {
+			continue
+		}
 		// Create preview
 		preview, err := a.createMarkdownPreview(blog, message)
 		if err != nil {
 			preview = []byte(err.Error())
 		}
 		// Write preview to socket
-		err = c.WriteMessage(mt, preview)
+		err = c.WriteMessage(websocket.TextMessage, preview)
 		if err != nil {
 			break
 		}
diff --git a/editor_test.go b/editor_test.go
new file mode 100644
index 0000000..43c19b9
--- /dev/null
+++ b/editor_test.go
@@ -0,0 +1,62 @@
+package main
+
+import (
+	"context"
+	"net/http"
+	"path/filepath"
+	"testing"
+
+	"github.com/gorilla/websocket"
+	"github.com/posener/wstest"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_editorPreview(t *testing.T) {
+
+	app := &goBlog{
+		cfg: &config{
+			Server: &configServer{},
+			Db: &configDb{
+				File: filepath.Join(t.TempDir(), "test.db"),
+			},
+			Blogs: map[string]*configBlog{
+				"en": {
+					Lang: "en",
+					Sections: map[string]*configSection{
+						"test": {
+							Title: "Test",
+						},
+					},
+					DefaultSection: "test",
+				},
+			},
+			DefaultBlog: "en",
+			Micropub:    &configMicropub{},
+		},
+	}
+	_ = app.initDatabase(false)
+	app.initComponents(false)
+
+	h := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+		app.serveEditorPreview(rw, r.WithContext(context.WithValue(r.Context(), blogKey, "en")))
+	})
+
+	d := wstest.NewDialer(h)
+
+	c, _, err := d.Dial("ws://whatever/editor/preview", nil)
+	require.NoError(t, err)
+	require.NotNil(t, c)
+
+	err = c.WriteMessage(websocket.TextMessage, []byte("---\ntitle: Title\nsection: test\n---\nContent."))
+	require.NoError(t, err)
+
+	mt, msg, err := c.ReadMessage()
+	require.NoError(t, err)
+	require.Equal(t, websocket.TextMessage, mt)
+
+	msgStr := string(msg)
+	require.Contains(t, msgStr, "<h1>Title")
+	require.Contains(t, msgStr, "<p>Content")
+	require.Contains(t, msgStr, "Test")
+
+}
diff --git a/go.mod b/go.mod
index f6dd188..3915c2a 100644
--- a/go.mod
+++ b/go.mod
@@ -33,6 +33,7 @@ require (
 	github.com/mattn/go-sqlite3 v1.14.9
 	github.com/microcosm-cc/bluemonday v1.0.16
 	github.com/paulmach/go.geojson v1.4.0
+	github.com/posener/wstest v1.2.0
 	github.com/pquerna/otp v1.3.0
 	github.com/schollz/sqlite3dump v1.3.1
 	github.com/snabb/sitemap v1.0.0
diff --git a/go.sum b/go.sum
index 17e6ea2..87d172f 100644
--- a/go.sum
+++ b/go.sum
@@ -244,6 +244,7 @@ github.com/gorilla/securecookie v1.1.1 h1:miw7JPhV+b/lAHSXz4qd/nN9jRiAFV5FwjeKyC
 github.com/gorilla/securecookie v1.1.1/go.mod h1:ra0sb63/xPlUeL+yeDciTfxMRAA+MP+HVt/4epWDjd4=
 github.com/gorilla/sessions v1.2.1 h1:DHd3rPN5lE3Ts3D8rKkQ8x/0kqfeNmBAaiSi+o7FsgI=
 github.com/gorilla/sessions v1.2.1/go.mod h1:dk2InVEVJ0sfLlnXv9EAgkf6ecYs/i80K/zI+bUmuGM=
+github.com/gorilla/websocket v1.4.1/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
 github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/grpc-ecosystem/grpc-gateway v1.16.0/go.mod h1:BDjrQk3hbvj6Nolgz8mAMFbcEtjT1g+wF4CSlocrBnw=
@@ -398,6 +399,8 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/posener/complete v1.1.1/go.mod h1:em0nMJCgc9GFtwrmVmEMR/ZL6WyhyjMBndrE9hABlRI=
 github.com/posener/complete v1.2.3/go.mod h1:WZIdtGGp+qx0sLrYKtIRAruyNpv6hFCicSgv7Sy7s/s=
+github.com/posener/wstest v1.2.0 h1:PAY0cRybxOjh0yqSDCrlAGUwtx+GNKpuUfid/08pv48=
+github.com/posener/wstest v1.2.0/go.mod h1:GkplCx9zskpudjrMp23LyZHrSonab0aZzh2x0ACGRbU=
 github.com/pquerna/otp v1.3.0 h1:oJV/SkzR33anKXwQU3Of42rL4wbrffP4uvUf1SvS5Xs=
 github.com/pquerna/otp v1.3.0/go.mod h1:dkJfzwRKNiegxyNb54X/3fLwhCynbMspSyWKnvi1AEg=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=