diff --git a/ruma-api-macros/src/api.rs b/ruma-api-macros/src/api.rs
index a7a42c88..b2024c98 100644
--- a/ruma-api-macros/src/api.rs
+++ b/ruma-api-macros/src/api.rs
@@ -160,7 +160,7 @@ impl ToTokens for Api {
                             let decoded =
                                 ruma_api::exports::percent_encoding::percent_decode(segment)
                                 .decode_utf8_lossy();
-                            match ruma_api::exports::serde_json::from_str(decoded.deref()) {
+                            match std::convert::TryFrom::try_from(decoded.deref()) {
                                 Ok(val) => val,
                                 Err(err) => {
                                     return Err(
diff --git a/src/error.rs b/src/error.rs
index 364f36a0..f90f37f8 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -193,6 +193,7 @@ enum SerializationError {
 pub enum DeserializationError {
     Json(serde_json::Error),
     Query(serde_urlencoded::de::Error),
+    Ident(ruma_identifiers::Error),
 }
 
 impl Display for DeserializationError {
@@ -200,6 +201,7 @@ impl Display for DeserializationError {
         match self {
             DeserializationError::Json(err) => Display::fmt(err, f),
             DeserializationError::Query(err) => Display::fmt(err, f),
+            DeserializationError::Ident(err) => Display::fmt(err, f),
         }
     }
 }
@@ -217,3 +219,17 @@ impl From<serde_urlencoded::de::Error> for DeserializationError {
         Self::Query(err)
     }
 }
+
+#[doc(hidden)]
+impl From<ruma_identifiers::Error> for DeserializationError {
+    fn from(err: ruma_identifiers::Error) -> Self {
+        Self::Ident(err)
+    }
+}
+
+#[doc(hidden)]
+impl From<std::convert::Infallible> for DeserializationError {
+    fn from(err: std::convert::Infallible) -> Self {
+        match err {}
+    }
+}
diff --git a/tests/conversions.rs b/tests/conversions.rs
new file mode 100644
index 00000000..55bdc578
--- /dev/null
+++ b/tests/conversions.rs
@@ -0,0 +1,61 @@
+use ruma_api::ruma_api;
+use ruma_identifiers::UserId;
+
+ruma_api! {
+    metadata {
+        description: "Does something.",
+        method: POST,
+        name: "my_endpoint",
+        path: "/_matrix/foo/:bar/:baz",
+        rate_limited: false,
+        requires_authentication: false,
+    }
+
+    request {
+        pub hello: String,
+        #[ruma_api(header = CONTENT_TYPE)]
+        pub world: String,
+        #[ruma_api(query)]
+        pub q1: String,
+        #[ruma_api(query)]
+        pub q2: u32,
+        #[ruma_api(path)]
+        pub bar: String,
+        #[ruma_api(path)]
+        pub baz: UserId,
+    }
+
+    response {
+        pub hello: String,
+        #[ruma_api(header = CONTENT_TYPE)]
+        pub world: String,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        pub optional_flag: Option<bool>,
+    }
+}
+
+#[test]
+fn request_serde() -> Result<(), Box<dyn std::error::Error + 'static>> {
+    use std::convert::TryFrom;
+
+    let req = Request {
+        hello: "hi".to_owned(),
+        world: "test".to_owned(),
+        q1: "query_param_special_chars %/&@!".to_owned(),
+        q2: 55,
+        bar: "bar".to_owned(),
+        baz: UserId::try_from("@bazme:ruma.io")?,
+    };
+
+    let http_req = http::Request::<Vec<u8>>::try_from(req.clone())?;
+    let req2 = Request::try_from(http_req)?;
+
+    assert_eq!(req.hello, req2.hello);
+    assert_eq!(req.world, req2.world);
+    assert_eq!(req.q1, req2.q1);
+    assert_eq!(req.q2, req2.q2);
+    assert_eq!(req.bar, req2.bar);
+    assert_eq!(req.baz, req2.baz);
+
+    Ok(())
+}