diff --git a/metropolis/node/common/jsonpatch/BUILD.bazel b/metropolis/node/common/jsonpatch/BUILD.bazel
new file mode 100644
index 0000000..bd77e0a
--- /dev/null
+++ b/metropolis/node/common/jsonpatch/BUILD.bazel
@@ -0,0 +1,14 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["jsonpatch.go.go"],
+    importpath = "git.monogon.dev/source/nexantic.git/metropolis/node/common/jsonpatch",
+    visibility = ["//visibility:public"],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = ["jsonpatch_test.go"],
+    embed = [":go_default_library"],
+)
diff --git a/metropolis/node/common/jsonpatch/jsonpatch.go.go b/metropolis/node/common/jsonpatch/jsonpatch.go.go
new file mode 100644
index 0000000..9682980
--- /dev/null
+++ b/metropolis/node/common/jsonpatch/jsonpatch.go.go
@@ -0,0 +1,44 @@
+// Copyright 2020 The Monogon Project Authors.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package jsonpatch contains data structures and encoders for JSON Patch (RFC 6902) and JSON Pointers (RFC 6901)
+package jsonpatch
+
+import "strings"
+
+// JSON Patch operation (RFC 6902 Section 4)
+type JsonPatchOp struct {
+	Operation string      `json:"op"`
+	Path      string      `json:"path"` // Technically a JSON Pointer, but called Path in the RFC
+	From      string      `json:"from,omitempty"`
+	Value     interface{} `json:"value,omitempty"`
+}
+
+// EncodeJSONRefToken encodes a JSON reference token as part of a JSON Pointer (RFC 6901 Section 2)
+func EncodeJSONRefToken(token string) string {
+	x := strings.ReplaceAll(token, "~", "~0")
+	return strings.ReplaceAll(x, "/", "~1")
+}
+
+// PointerFromParts returns an encoded JSON Pointer from parts
+func PointerFromParts(pathParts []string) string {
+	var encodedParts []string
+	encodedParts = append(encodedParts, "")
+	for _, part := range pathParts {
+		encodedParts = append(encodedParts, EncodeJSONRefToken(part))
+	}
+	return strings.Join(encodedParts, "/")
+}
diff --git a/metropolis/node/common/jsonpatch/jsonpatch_test.go b/metropolis/node/common/jsonpatch/jsonpatch_test.go
new file mode 100644
index 0000000..33a56ba
--- /dev/null
+++ b/metropolis/node/common/jsonpatch/jsonpatch_test.go
@@ -0,0 +1,66 @@
+// Copyright 2020 The Monogon Project Authors.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jsonpatch
+
+import (
+	"testing"
+)
+
+func TestEncodeJSONRefToken(t *testing.T) {
+	tests := []struct {
+		name  string
+		token string
+		want  string
+	}{
+		{"Passes through normal characters", "asdf123", "asdf123"},
+		{"Encodes simple slashes", "a/b", "a~1b"},
+		{"Encodes tildes", "m~n", "m~0n"},
+		{"Encodes bot tildes and slashes", "a/m~n", "a~1m~0n"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := EncodeJSONRefToken(tt.token); got != tt.want {
+				t.Errorf("EncodeJSONRefToken() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestPointerFromParts(t *testing.T) {
+	type args struct {
+		pathParts []string
+	}
+	tests := []struct {
+		name string
+		args args
+		want string
+	}{
+		{"Empty path", args{[]string{}}, ""},
+		{"Single level path", args{[]string{"foo"}}, "/foo"},
+		{"Multi-level path", args{[]string{"foo", "0"}}, "/foo/0"},
+		{"Path starting with empty key", args{[]string{""}}, "/"},
+		{"Path with part containing /", args{[]string{"a/b"}}, "/a~1b"},
+		{"Path with part containing spaces", args{[]string{" "}}, "/ "},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := PointerFromParts(tt.args.pathParts); got != tt.want {
+				t.Errorf("PointerFromParts() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}