diff --git a/go/svix_test.go b/go/svix_test.go
index 5e9d06ab8..09f908e7b 100644
--- a/go/svix_test.go
+++ b/go/svix_test.go
@@ -2,6 +2,7 @@ package svix_test
 
 import (
 	"context"
+	"encoding/json"
 	"errors"
 	"net/http"
 	"net/url"
@@ -114,3 +115,241 @@ func TestStaticNullableString(t *testing.T) {
 		t.Fatalf("app.Uid is set but shouldn't be")
 	}
 }
+
+func assertMarshalEq(v any, expected string, t *testing.T) {
+	bytes, err := json.Marshal(v)
+	if err != nil {
+		t.Error("JSON serialization failed", err)
+		return
+	}
+
+	s := string(bytes)
+	if s != expected {
+		t.Error("Unexpected serialization", s)
+	}
+}
+
+func TestModelSerialization(t *testing.T) {
+	ep_in := svix.EndpointIn{
+		Url: "http://example.local",
+	}
+	assertMarshalEq(ep_in, `{"url":"http://example.local"}`, t)
+
+	uid := "test"
+	ep_in.Uid = &uid
+	assertMarshalEq(ep_in, `{"uid":"test","url":"http://example.local"}`, t)
+
+	uid = ""
+	ep_in.Uid = &uid
+	assertMarshalEq(ep_in, `{"uid":"","url":"http://example.local"}`, t)
+
+	metadata := make(map[string]string)
+	ep_in.Uid = nil
+	ep_in.Metadata = &metadata
+	assertMarshalEq(ep_in, `{"metadata":{},"url":"http://example.local"}`, t)
+
+	ep_patch := svix.EndpointPatch{}
+	assertMarshalEq(ep_patch, `{}`, t)
+
+	// FIXME: setting channels to `null` not currently possible
+	ep_patch.Channels = []string{}
+	assertMarshalEq(ep_patch, `{"channels":[]}`, t)
+
+	ep_patch.Channels = []string{"foo"}
+	assertMarshalEq(ep_patch, `{"channels":["foo"]}`, t)
+
+	ep_patch.Channels = nil
+	disabled := false
+	ep_patch.Disabled = &disabled
+	assertMarshalEq(ep_patch, `{"disabled":false}`, t)
+
+	ep_patch.Disabled = nil
+	ep_patch.Uid = *svix.NullableString(nil)
+	assertMarshalEq(ep_patch, `{"uid":null}`, t)
+}
+
+func TestModelDeserialization(t *testing.T) {
+	var ep_out svix.EndpointOut
+
+	// only required properties
+	err := json.Unmarshal(
+		[]byte(`{
+			"id": "ep_foo",
+			"metadata": {"foo": "bar"},
+			"description": "x",
+			"url": "http://example.local",
+			"version": 1,
+			"createdAt": "2019-08-24T14:15:22Z",
+			"updatedAt": "2019-08-24T14:15:22Z"
+		}`),
+		&ep_out,
+	)
+	if err != nil {
+		t.Fatal("JSON deserialization failed", err)
+	}
+	if len(ep_out.Channels) != 0 {
+		t.Error("unexpected value for channels", ep_out.Channels)
+	}
+	if ep_out.Id != "ep_foo" {
+		t.Error("unexpected value for id", ep_out.Id)
+	}
+	if len(ep_out.Metadata) != 1 {
+		t.Error("unexpected value for metadata", ep_out.Metadata)
+	}
+	if ep_out.Metadata["foo"] != "bar" {
+		t.Error("unexpected value for metadata", ep_out.Metadata)
+	}
+	if ep_out.Description != "x" {
+		t.Error("unexpected value for description", ep_out.Description)
+	}
+	if ep_out.Disabled != nil {
+		t.Error("unexpected value for disabled", ep_out.Disabled)
+	}
+	if len(ep_out.FilterTypes) != 0 {
+		t.Error("unexpected value for filterTypes", ep_out.FilterTypes)
+	}
+	if ep_out.RateLimit != nil {
+		t.Error("unexpected value for rateLimit", ep_out.RateLimit)
+	}
+	if ep_out.Uid != nil {
+		t.Error("unexpected value for uid", ep_out.Uid)
+	}
+	if ep_out.Url != "http://example.local" {
+		t.Error("unexpected value for url", ep_out.Url)
+	}
+	if ep_out.Version != 1 {
+		t.Error("unexpected value for version", ep_out.Version)
+	}
+
+	// full example from API docs
+	err = json.Unmarshal(
+		[]byte(`{
+			"id": "ep_1srOrx2ZWZBpBUvZwXKQmoEYga2",
+			"metadata": {
+				"property1": "string",
+				"property2": "string"
+			},
+			"description": "string",
+			"rateLimit": 0,
+			"uid": "unique-ep-identifier",
+			"url": "https://example.com/webhook/",
+			"version": 1,
+			"disabled": false,
+			"filterTypes": [
+				"user.signup",
+				"user.deleted"
+			],
+			"channels": [
+				"project_123",
+				"group_2"
+			],
+			"createdAt": "2019-08-24T14:15:22Z",
+			"updatedAt": "2019-08-24T14:15:22Z"
+		}`),
+		&ep_out,
+	)
+	if err != nil {
+		t.Fatal("JSON deserialization failed", err)
+	}
+	if ep_out.Id != "ep_1srOrx2ZWZBpBUvZwXKQmoEYga2" {
+		t.Error("unexpected value for id", ep_out.Id)
+	}
+	if len(ep_out.Metadata) != 2 {
+		t.Error("unexpected value for metadata", ep_out.Metadata)
+	}
+	if ep_out.Metadata["property1"] != "string" {
+		t.Error("unexpected value for metadata", ep_out.Metadata)
+	}
+	if ep_out.Metadata["property2"] != "string" {
+		t.Error("unexpected value for metadata", ep_out.Metadata)
+	}
+	if ep_out.Description != "string" {
+		t.Error("unexpected value for description", ep_out.Description)
+	}
+	if *ep_out.RateLimit != 0 {
+		t.Error("unexpected value for rateLimit", ep_out.RateLimit)
+	}
+	if *ep_out.Uid != "unique-ep-identifier" {
+		t.Error("unexpected value for uid", ep_out.Uid)
+	}
+	if ep_out.Url != "https://example.com/webhook/" {
+		t.Error("unexpected value for url", ep_out.Url)
+	}
+	if ep_out.Version != 1 {
+		t.Error("unexpected value for version", ep_out.Version)
+	}
+	if *ep_out.Disabled != false {
+		t.Error("unexpected value for disabled", ep_out.Disabled)
+	}
+	if len(ep_out.FilterTypes) != 2 {
+		t.Error("unexpected value for filterTypes", ep_out.FilterTypes)
+	}
+	if ep_out.FilterTypes[0] != "user.signup" {
+		t.Error("unexpected value for filterTypes", ep_out.FilterTypes)
+	}
+	if ep_out.FilterTypes[1] != "user.deleted" {
+		t.Error("unexpected value for filterTypes", ep_out.FilterTypes)
+	}
+	if len(ep_out.Channels) != 2 {
+		t.Error("unexpected value for channels", ep_out.Channels)
+	}
+	if ep_out.Channels[0] != "project_123" {
+		t.Error("unexpected value for channels", ep_out.Channels)
+	}
+	if ep_out.Channels[1] != "group_2" {
+		t.Error("unexpected value for channels", ep_out.Channels)
+	}
+
+	// same example with optional / nullable fields set to null explicitly
+	// (and empty metadata)
+	err = json.Unmarshal(
+		[]byte(`{
+			"id": "ep_1srOrx2ZWZBpBUvZwXKQmoEYga2",
+			"metadata": {},
+			"description": "string",
+			"rateLimit": null,
+			"uid": null,
+			"url": "https://example.com/webhook/",
+			"version": 1,
+			"disabled": null,
+			"filterTypes": null,
+			"channels": null,
+			"createdAt": "2019-08-24T14:15:22Z",
+			"updatedAt": "2019-08-24T14:15:22Z"
+		}`),
+		&ep_out,
+	)
+	if err != nil {
+		t.Fatal("JSON deserialization failed", err)
+	}
+	if ep_out.Id != "ep_1srOrx2ZWZBpBUvZwXKQmoEYga2" {
+		t.Error("unexpected value for id", ep_out.Id)
+	}
+	if len(ep_out.Metadata) != 0 {
+		t.Error("unexpected value for metadata", ep_out.Metadata)
+	}
+	if ep_out.Description != "string" {
+		t.Error("unexpected value for description", ep_out.Description)
+	}
+	if ep_out.RateLimit != nil {
+		t.Error("unexpected value for rateLimit", ep_out.RateLimit)
+	}
+	if ep_out.Uid != nil {
+		t.Error("unexpected value for uid", ep_out.Uid)
+	}
+	if ep_out.Url != "https://example.com/webhook/" {
+		t.Error("unexpected value for url", ep_out.Url)
+	}
+	if ep_out.Version != 1 {
+		t.Error("unexpected value for version", ep_out.Version)
+	}
+	if ep_out.Disabled != nil {
+		t.Error("unexpected value for disabled", ep_out.Disabled)
+	}
+	if len(ep_out.FilterTypes) != 0 {
+		t.Error("unexpected value for filterTypes", ep_out.FilterTypes)
+	}
+	if len(ep_out.Channels) != 0 {
+		t.Error("unexpected value for channels", ep_out.Channels)
+	}
+}