diff --git a/src/error.rs b/src/error.rs
index e13d389e..ba17ba7b 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -2,13 +2,13 @@ use std::collections::BTreeMap;
 use std::fmt::{self, Debug, Display, Formatter};
 use std::marker::PhantomData;
 
-use serde::Serialize;
+use serde::{Deserialize, Serialize};
 use thiserror::Error;
 
 use crate::{parser, InputValueType, Pos, Value};
 
 /// Extensions to the error.
-#[derive(Debug, Clone, PartialEq, Eq, Serialize, Default)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, Default)]
 #[serde(transparent)]
 pub struct ErrorExtensionValues(BTreeMap<String, Value>);
 
@@ -20,18 +20,18 @@ impl ErrorExtensionValues {
 }
 
 /// An error in a GraphQL server.
-#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct ServerError {
     /// An explanatory message of the error.
     pub message: String,
     /// Where the error occurred.
-    #[serde(skip_serializing_if = "Vec::is_empty")]
+    #[serde(skip_serializing_if = "Vec::is_empty", default)]
     pub locations: Vec<Pos>,
     /// If the error occurred in a resolver, the path to the error.
-    #[serde(skip_serializing_if = "Vec::is_empty")]
+    #[serde(skip_serializing_if = "Vec::is_empty", default)]
     pub path: Vec<PathSegment>,
     /// Extensions to the error.
-    #[serde(skip_serializing_if = "error_extensions_is_empty")]
+    #[serde(skip_serializing_if = "error_extensions_is_empty", default)]
     pub extensions: Option<ErrorExtensionValues>,
 }
 
@@ -96,7 +96,7 @@ impl From<parser::Error> for ServerError {
 ///
 /// This is like [`QueryPathSegment`](enum.QueryPathSegment.html), but owned and used as a part of
 /// errors instead of during execution.
-#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(untagged)]
 pub enum PathSegment {
     /// A field in an object.
diff --git a/src/request.rs b/src/request.rs
index 7390b0f7..d510c189 100644
--- a/src/request.rs
+++ b/src/request.rs
@@ -2,7 +2,7 @@ use std::any::Any;
 use std::collections::HashMap;
 use std::fmt::{self, Debug, Formatter};
 
-use serde::{Deserialize, Deserializer};
+use serde::{Deserialize, Deserializer, Serialize};
 
 use crate::{Data, ParseRequestError, UploadValue, Value, Variables};
 
@@ -10,7 +10,7 @@ use crate::{Data, ParseRequestError, UploadValue, Value, Variables};
 ///
 /// This can be deserialized from a structure of the query string, the operation name and the
 /// variables. The names are all in `camelCase` (e.g. `operationName`).
-#[derive(Deserialize)]
+#[derive(Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct Request {
     /// The query source of the request.
diff --git a/src/response.rs b/src/response.rs
index e98f915e..1ad0f363 100644
--- a/src/response.rs
+++ b/src/response.rs
@@ -1,15 +1,16 @@
-use serde::Serialize;
+use serde::{Deserialize, Serialize};
 
 use crate::{CacheControl, Result, ServerError, Value};
 
 /// Query response
-#[derive(Debug, Default, Serialize)]
+#[derive(Debug, Default, Serialize, Deserialize)]
 pub struct Response {
     /// Data of query result
+    #[serde(default)]
     pub data: Value,
 
     /// Extensions result
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[serde(skip_serializing_if = "Option::is_none", default)]
     pub extensions: Option<Value>,
 
     /// Cache control value
@@ -17,7 +18,7 @@ pub struct Response {
     pub cache_control: CacheControl,
 
     /// Errors
-    #[serde(skip_serializing_if = "Vec::is_empty")]
+    #[serde(skip_serializing_if = "Vec::is_empty", default)]
     pub errors: Vec<ServerError>,
 }