diff --git a/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/mod.rs b/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/mod.rs
index 2ba66c426d3..8b3d097a737 100644
--- a/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/mod.rs
+++ b/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/mod.rs
@@ -18,10 +18,7 @@ use indexed_db_futures::{prelude::*, web_sys::DomException};
 use tracing::info;
 use wasm_bindgen::JsValue;
 
-use crate::{
-    crypto_store::{indexeddb_serializer::IndexeddbSerializer, Result},
-    IndexeddbCryptoStoreError,
-};
+use crate::{crypto_store::Result, serializer::IndexeddbSerializer, IndexeddbCryptoStoreError};
 
 mod old_keys;
 mod v0_to_v5;
diff --git a/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/v10_to_v11.rs b/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/v10_to_v11.rs
index 11de8b32a90..2e6c1bb2297 100644
--- a/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/v10_to_v11.rs
+++ b/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/v10_to_v11.rs
@@ -19,10 +19,12 @@ use indexed_db_futures::IdbQuerySource;
 use wasm_bindgen::JsValue;
 use web_sys::{DomException, IdbTransactionMode};
 
-use crate::crypto_store::{
-    indexeddb_serializer::IndexeddbSerializer,
-    keys,
-    migrations::{do_schema_upgrade, old_keys, MigrationDb},
+use crate::{
+    crypto_store::{
+        keys,
+        migrations::{do_schema_upgrade, old_keys, MigrationDb},
+    },
+    serializer::IndexeddbSerializer,
 };
 
 /// Migrate data from `backup_keys.backup_key_v1` to
diff --git a/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/v5_to_v7.rs b/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/v5_to_v7.rs
index 473960b3ff4..dd54665f6a2 100644
--- a/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/v5_to_v7.rs
+++ b/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/v5_to_v7.rs
@@ -26,11 +26,11 @@ use web_sys::{DomException, IdbTransactionMode};
 
 use crate::{
     crypto_store::{
-        indexeddb_serializer::IndexeddbSerializer,
         keys,
         migrations::{add_nonunique_index, do_schema_upgrade, old_keys, v7, MigrationDb},
         Result,
     },
+    serializer::IndexeddbSerializer,
     IndexeddbCryptoStoreError,
 };
 
diff --git a/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/v7_to_v8.rs b/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/v7_to_v8.rs
index 9cba57a7b1f..f6092da2101 100644
--- a/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/v7_to_v8.rs
+++ b/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/v7_to_v8.rs
@@ -22,10 +22,10 @@ use web_sys::{DomException, IdbTransactionMode};
 
 use crate::{
     crypto_store::{
-        indexeddb_serializer::IndexeddbSerializer,
         migrations::{do_schema_upgrade, old_keys, v7, MigrationDb},
         Result,
     },
+    serializer::IndexeddbSerializer,
     IndexeddbCryptoStoreError,
 };
 
diff --git a/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/v8_to_v10.rs b/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/v8_to_v10.rs
index e180b56492b..61a8f58da3e 100644
--- a/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/v8_to_v10.rs
+++ b/crates/matrix-sdk-indexeddb/src/crypto_store/migrations/v8_to_v10.rs
@@ -22,7 +22,6 @@ use web_sys::{DomException, IdbTransactionMode};
 
 use crate::{
     crypto_store::{
-        indexeddb_serializer::IndexeddbSerializer,
         keys,
         migrations::{
             add_nonunique_index, do_schema_upgrade, old_keys,
@@ -30,6 +29,7 @@ use crate::{
         },
         InboundGroupSessionIndexedDbObject, Result,
     },
+    serializer::IndexeddbSerializer,
     IndexeddbCryptoStoreError,
 };
 
diff --git a/crates/matrix-sdk-indexeddb/src/crypto_store/mod.rs b/crates/matrix-sdk-indexeddb/src/crypto_store/mod.rs
index 520c3d03839..7ffcafa2a20 100644
--- a/crates/matrix-sdk-indexeddb/src/crypto_store/mod.rs
+++ b/crates/matrix-sdk-indexeddb/src/crypto_store/mod.rs
@@ -47,12 +47,11 @@ use tracing::{debug, warn};
 use wasm_bindgen::JsValue;
 use web_sys::IdbKeyRange;
 
-use self::indexeddb_serializer::MaybeEncrypted;
-use crate::crypto_store::{
-    indexeddb_serializer::IndexeddbSerializer, migrations::open_and_upgrade_db,
+use crate::{
+    crypto_store::migrations::open_and_upgrade_db,
+    serializer::{IndexeddbSerializer, IndexeddbSerializerError, MaybeEncrypted},
 };
 
-mod indexeddb_serializer;
 mod migrations;
 
 mod keys {
@@ -148,6 +147,20 @@ pub enum IndexeddbCryptoStoreError {
     SchemaTooNewError { max_supported_version: u32, current_version: u32 },
 }
 
+impl From<IndexeddbSerializerError> for IndexeddbCryptoStoreError {
+    fn from(value: IndexeddbSerializerError) -> Self {
+        match value {
+            IndexeddbSerializerError::Serialization(error) => Self::Serialization(error),
+            IndexeddbSerializerError::DomException { code, name, message } => {
+                Self::DomException { code, name, message }
+            }
+            IndexeddbSerializerError::CryptoStoreError(crypto_store_error) => {
+                Self::CryptoStoreError(crypto_store_error)
+            }
+        }
+    }
+}
+
 impl From<web_sys::DomException> for IndexeddbCryptoStoreError {
     fn from(frm: web_sys::DomException) -> IndexeddbCryptoStoreError {
         IndexeddbCryptoStoreError::DomException {
@@ -1141,7 +1154,7 @@ impl_crypto_store! {
             .object_store(keys::DEVICES)?
             .get(&key)?
             .await?
-            .map(|i| self.serializer.deserialize_value(i))
+            .map(|i| self.serializer.deserialize_value(i).map_err(Into::into))
             .transpose()
     }
 
@@ -1178,7 +1191,7 @@ impl_crypto_store! {
             .object_store(keys::IDENTITIES)?
             .get(&self.serializer.encode_key(keys::IDENTITIES, user_id))?
             .await?
-            .map(|i| self.serializer.deserialize_value(i))
+            .map(|i| self.serializer.deserialize_value(i).map_err(Into::into))
             .transpose()
     }
 
@@ -1355,7 +1368,7 @@ impl_crypto_store! {
             .object_store(keys::ROOM_SETTINGS)?
             .get(&key)?
             .await?
-            .map(|v| self.serializer.deserialize_value(v))
+            .map(|v| self.serializer.deserialize_value(v).map_err(Into::into))
             .transpose()
     }
 
@@ -1372,7 +1385,7 @@ impl_crypto_store! {
             .object_store(keys::CORE)?
             .get(&JsValue::from_str(key))?
             .await?
-            .map(|v| self.serializer.deserialize_value(v))
+            .map(|v| self.serializer.deserialize_value(v).map_err(Into::into))
             .transpose()
     }
 
@@ -1769,7 +1782,7 @@ mod unit_tests {
     use ruma::{device_id, room_id, user_id};
 
     use super::InboundGroupSessionIndexedDbObject;
-    use crate::crypto_store::indexeddb_serializer::{IndexeddbSerializer, MaybeEncrypted};
+    use crate::serializer::{IndexeddbSerializer, MaybeEncrypted};
 
     #[test]
     fn needs_backup_is_serialized_as_a_u8_in_json() {
diff --git a/crates/matrix-sdk-indexeddb/src/lib.rs b/crates/matrix-sdk-indexeddb/src/lib.rs
index a828ac6755c..94b2c5b5315 100644
--- a/crates/matrix-sdk-indexeddb/src/lib.rs
+++ b/crates/matrix-sdk-indexeddb/src/lib.rs
@@ -9,6 +9,8 @@ mod crypto_store;
 mod safe_encode;
 #[cfg(feature = "e2e-encryption")]
 mod serialize_bool_for_indexeddb;
+#[cfg(feature = "e2e-encryption")]
+mod serializer;
 #[cfg(feature = "state-store")]
 mod state_store;
 
diff --git a/crates/matrix-sdk-indexeddb/src/crypto_store/indexeddb_serializer.rs b/crates/matrix-sdk-indexeddb/src/serializer.rs
similarity index 93%
rename from crates/matrix-sdk-indexeddb/src/crypto_store/indexeddb_serializer.rs
rename to crates/matrix-sdk-indexeddb/src/serializer.rs
index 6237403bba9..0cecf36c05f 100644
--- a/crates/matrix-sdk-indexeddb/src/crypto_store/indexeddb_serializer.rs
+++ b/crates/matrix-sdk-indexeddb/src/serializer.rs
@@ -27,9 +27,9 @@ use wasm_bindgen::JsValue;
 use web_sys::IdbKeyRange;
 use zeroize::Zeroizing;
 
-use crate::{safe_encode::SafeEncode, IndexeddbCryptoStoreError};
+use crate::safe_encode::SafeEncode;
 
-type Result<A, E = IndexeddbCryptoStoreError> = std::result::Result<A, E>;
+type Result<A, E = IndexeddbSerializerError> = std::result::Result<A, E>;
 
 const BASE64: GeneralPurpose = GeneralPurpose::new(&alphabet::STANDARD, general_purpose::NO_PAD);
 
@@ -39,6 +39,35 @@ pub struct IndexeddbSerializer {
     store_cipher: Option<Arc<StoreCipher>>,
 }
 
+#[derive(Debug, thiserror::Error)]
+pub enum IndexeddbSerializerError {
+    #[error(transparent)]
+    Serialization(#[from] serde_json::Error),
+    #[error("DomException {name} ({code}): {message}")]
+    DomException {
+        /// DomException code
+        code: u16,
+        /// Specific name of the DomException
+        name: String,
+        /// Message given to the DomException
+        message: String,
+    },
+    #[error(transparent)]
+    CryptoStoreError(#[from] CryptoStoreError),
+}
+
+impl From<web_sys::DomException> for IndexeddbSerializerError {
+    fn from(frm: web_sys::DomException) -> Self {
+        Self::DomException { name: frm.name(), message: frm.message(), code: frm.code() }
+    }
+}
+
+impl From<serde_wasm_bindgen::Error> for IndexeddbSerializerError {
+    fn from(e: serde_wasm_bindgen::Error) -> Self {
+        Self::Serialization(serde::de::Error::custom(e.to_string()))
+    }
+}
+
 #[derive(Debug, Deserialize, Serialize)]
 #[serde(untagged)]
 pub enum MaybeEncrypted {
@@ -90,7 +119,7 @@ impl IndexeddbSerializer {
         &self,
         table_name: &str,
         key: T,
-    ) -> Result<IdbKeyRange, IndexeddbCryptoStoreError>
+    ) -> Result<IdbKeyRange, IndexeddbSerializerError>
     where
         T: SafeEncode,
     {
@@ -98,7 +127,7 @@ impl IndexeddbSerializer {
             Some(cipher) => key.encode_to_range_secure(table_name, cipher),
             None => key.encode_to_range(),
         }
-        .map_err(|e| IndexeddbCryptoStoreError::DomException {
+        .map_err(|e| IndexeddbSerializerError::DomException {
             code: 0,
             name: "IdbKeyRangeMakeError".to_owned(),
             message: e,
@@ -113,7 +142,7 @@ impl IndexeddbSerializer {
     pub fn serialize_value(
         &self,
         value: &impl Serialize,
-    ) -> Result<JsValue, IndexeddbCryptoStoreError> {
+    ) -> Result<JsValue, IndexeddbSerializerError> {
         let serialized = self.maybe_encrypt_value(value)?;
         Ok(serde_wasm_bindgen::to_value(&serialized)?)
     }
@@ -167,7 +196,7 @@ impl IndexeddbSerializer {
     pub fn deserialize_value<T: DeserializeOwned>(
         &self,
         value: JsValue,
-    ) -> Result<T, IndexeddbCryptoStoreError> {
+    ) -> Result<T, IndexeddbSerializerError> {
         // Objects which are serialized nowadays should be represented as a
         // `MaybeEncrypted`. However, `serialize_value` previously used a
         // different format, so we need to handle that in case we have old data.
@@ -221,11 +250,11 @@ impl IndexeddbSerializer {
     pub fn deserialize_legacy_value<T: DeserializeOwned>(
         &self,
         value: JsValue,
-    ) -> Result<T, IndexeddbCryptoStoreError> {
+    ) -> Result<T, IndexeddbSerializerError> {
         match &self.store_cipher {
             Some(cipher) => {
                 if !value.is_array() {
-                    return Err(IndexeddbCryptoStoreError::CryptoStoreError(
+                    return Err(IndexeddbSerializerError::CryptoStoreError(
                         CryptoStoreError::UnpicklingError,
                     ));
                 }