diff --git a/lambda/shared/src/main/scala/feral/lambda/events/AppSyncLambdaAuthorizerEvent.scala b/lambda/shared/src/main/scala/feral/lambda/events/AppSyncLambdaAuthorizerEvent.scala
new file mode 100644
index 00000000..17a1b677
--- /dev/null
+++ b/lambda/shared/src/main/scala/feral/lambda/events/AppSyncLambdaAuthorizerEvent.scala
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2021 Typelevel
+ *
+ * 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 feral.lambda
+package events
+
+import io.circe.Decoder
+import io.circe.Json
+
+sealed abstract class AppSyncRequestContext {
+  def apiId: String
+  def accountId: String
+  def requestId: String
+  def queryString: String
+  def operationName: String
+  def variables: Map[String, Json]
+}
+
+object AppSyncRequestContext {
+
+  def apply(
+      apiId: String,
+      accountId: String,
+      requestId: String,
+      queryString: String,
+      operationName: String,
+      variables: Map[String, Json]
+  ): AppSyncRequestContext =
+    new Impl(
+      apiId,
+      accountId,
+      requestId,
+      queryString,
+      operationName,
+      variables
+    )
+
+  implicit def decoder: Decoder[AppSyncRequestContext] = Decoder.forProduct6(
+    "apiId",
+    "accountId",
+    "requestId",
+    "queryString",
+    "operationName",
+    "variables"
+  )(AppSyncRequestContext.apply)
+
+  private final case class Impl(
+      apiId: String,
+      accountId: String,
+      requestId: String,
+      queryString: String,
+      operationName: String,
+      variables: Map[String, Json]
+  ) extends AppSyncRequestContext {
+    override def productPrefix = "AppSyncRequestContext"
+  }
+}
+
+sealed abstract class AppSyncLambdaAuthorizerEvent {
+  def authorizationToken: String
+  def requestContext: AppSyncRequestContext
+  def requestHeaders: Map[String, String]
+}
+
+object AppSyncLambdaAuthorizerEvent {
+  def apply(
+      authorizationToken: String,
+      requestContext: AppSyncRequestContext,
+      requestHeaders: Map[String, String]
+  ): AppSyncLambdaAuthorizerEvent =
+    new Impl(
+      authorizationToken: String,
+      requestContext: AppSyncRequestContext,
+      requestHeaders: Map[String, String]
+    )
+
+  implicit def decoder: Decoder[AppSyncLambdaAuthorizerEvent] = Decoder.forProduct3(
+    "authorizationToken",
+    "requestContext",
+    "requestHeaders"
+  )(AppSyncLambdaAuthorizerEvent.apply)
+
+  private final case class Impl(
+      authorizationToken: String,
+      requestContext: AppSyncRequestContext,
+      requestHeaders: Map[String, String]
+  ) extends AppSyncLambdaAuthorizerEvent {
+    override def productPrefix = "AppSyncLambdaAuthorizerEvent"
+  }
+}
diff --git a/lambda/shared/src/test/scala/feral/lambda/events/AppSyncLambdaAuthorizerEventSuite.scala b/lambda/shared/src/test/scala/feral/lambda/events/AppSyncLambdaAuthorizerEventSuite.scala
new file mode 100644
index 00000000..f9e7cc0d
--- /dev/null
+++ b/lambda/shared/src/test/scala/feral/lambda/events/AppSyncLambdaAuthorizerEventSuite.scala
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2021 Typelevel
+ *
+ * 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 feral.lambda.events
+
+import io.circe.literal._
+import munit.FunSuite
+
+class AppSyncLambdaAuthorizerEventSuite extends FunSuite {
+
+  test("decoder") {
+    import AppSyncLambdaAuthorizerEventSuite._
+
+    val parsed_event = event.as[AppSyncLambdaAuthorizerEvent].toTry.get
+
+    assertEquals(parsed_event.authorizationToken, "ExampleAUTHtoken123123123")
+    assertEquals(parsed_event.requestContext.accountId, "111122223333")
+    assertEquals(parsed_event.requestContext.apiId, "aaaaaa123123123example123")
+    assertEquals(parsed_event.requestContext.requestId, "f4081827-1111-4444-5555-5cf4695f339f")
+    assertEquals(parsed_event.requestHeaders("header"), "value")
+  }
+
+}
+
+object AppSyncLambdaAuthorizerEventSuite {
+  def event = json"""
+    {
+        "authorizationToken": "ExampleAUTHtoken123123123",
+        "requestContext": {
+          "apiId": "aaaaaa123123123example123",
+          "accountId": "111122223333",
+          "requestId": "f4081827-1111-4444-5555-5cf4695f339f",
+          "queryString": "mutation CreateEvent {...}\n\nquery MyQuery {...}\n",
+          "operationName": "MyQuery",
+          "variables": {}
+      },
+        "requestHeaders": {
+            "header": "value"
+        }
+    }
+    """
+}