diff --git a/crates/ruma-client-api/src/r0/session/get_login_types.rs b/crates/ruma-client-api/src/r0/session/get_login_types.rs
index 6c411f23..8a9baaff 100644
--- a/crates/ruma-client-api/src/r0/session/get_login_types.rs
+++ b/crates/ruma-client-api/src/r0/session/get_login_types.rs
@@ -5,13 +5,12 @@ use std::borrow::Cow;
 use ruma_api::ruma_api;
 #[cfg(feature = "unstable-pre-spec")]
 use ruma_identifiers::MxcUri;
+use ruma_serde::JsonObject;
 #[cfg(feature = "unstable-pre-spec")]
 use ruma_serde::StringEnum;
 use serde::{de::DeserializeOwned, Deserialize, Serialize};
 use serde_json::Value as JsonValue;
 
-type JsonObject = serde_json::Map<String, JsonValue>;
-
 ruma_api! {
     metadata: {
         description: "Gets the homeserver's supported login types to authenticate users. Clients should pick one of these and supply it as the type when logging in.",
diff --git a/crates/ruma-events/src/room/message.rs b/crates/ruma-events/src/room/message.rs
index 8197835b..2b8f509f 100644
--- a/crates/ruma-events/src/room/message.rs
+++ b/crates/ruma-events/src/room/message.rs
@@ -8,7 +8,7 @@ use ruma_events_macros::EventContent;
 #[cfg(feature = "unstable-pre-spec")]
 use ruma_identifiers::{DeviceIdBox, UserId};
 use ruma_identifiers::{EventId, MxcUri};
-use ruma_serde::StringEnum;
+use ruma_serde::{JsonObject, StringEnum};
 use serde::{de::DeserializeOwned, Deserialize, Serialize};
 use serde_json::Value as JsonValue;
 
@@ -20,8 +20,6 @@ mod content_serde;
 pub mod feedback;
 mod relation_serde;
 
-type JsonObject = serde_json::Map<String, JsonValue>;
-
 /// This event is used when sending messages in a room.
 ///
 /// Messages are not limited to be text.
diff --git a/crates/ruma-serde/src/lib.rs b/crates/ruma-serde/src/lib.rs
index 7b9fc68c..dd20bee4 100644
--- a/crates/ruma-serde/src/lib.rs
+++ b/crates/ruma-serde/src/lib.rs
@@ -4,6 +4,8 @@
 
 #![warn(missing_docs)]
 
+use serde_json::Value as JsonValue;
+
 mod buf;
 pub mod can_be_empty;
 mod canonical_json;
@@ -32,6 +34,9 @@ pub use strings::{
     none_as_empty_string,
 };
 
+/// The inner type of [`serde_json::Value:::Object`].
+pub type JsonObject = serde_json::Map<String, JsonValue>;
+
 /// Check whether a value is equal to its default value.
 pub fn is_default<T: Default + PartialEq>(val: &T) -> bool {
     *val == T::default()