diff --git a/sdk/tests/mod.rs b/sdk/tests/mod.rs
index 281fac6a9b..6f63ac2fed 100644
--- a/sdk/tests/mod.rs
+++ b/sdk/tests/mod.rs
@@ -6,5 +6,6 @@ mod client;
 #[cfg(feature = "pow")]
 mod pow;
 mod types;
+mod utils;
 #[cfg(feature = "wallet")]
 mod wallet;
diff --git a/sdk/tests/utils/mod.rs b/sdk/tests/utils/mod.rs
new file mode 100644
index 0000000000..75be6e0971
--- /dev/null
+++ b/sdk/tests/utils/mod.rs
@@ -0,0 +1,4 @@
+// Copyright 2023 IOTA Stiftung
+// SPDX-License-Identifier: Apache-2.0
+
+mod serde;
diff --git a/sdk/tests/utils/serde.rs b/sdk/tests/utils/serde.rs
new file mode 100644
index 0000000000..a0c9614d9d
--- /dev/null
+++ b/sdk/tests/utils/serde.rs
@@ -0,0 +1,81 @@
+// Copyright 2023 IOTA Stiftung
+// SPDX-License-Identifier: Apache-2.0
+
+use core::str::FromStr;
+
+use iota_sdk::types::block::BlockId;
+use serde::{Deserialize, Serialize};
+
+const BLOCK_ID: &str = "0x52fdfc072182654f163f5f0f9a621d729566c74d10037c4d7bbb0407d1e2c649";
+
+#[derive(Serialize, Deserialize, Debug, Eq, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct SerdeStringTest {
+    #[serde(with = "iota_sdk::utils::serde::string")]
+    pub block_id: BlockId,
+}
+
+#[derive(Serialize, Deserialize, Debug, Eq, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct SerdeOptionStringTest {
+    #[serde(with = "iota_sdk::utils::serde::option_string")]
+    pub block_id: Option<BlockId>,
+}
+
+#[derive(Serialize, Deserialize, Debug, Eq, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct SerdeOptionPrefixHexVecTest {
+    #[serde(default, with = "iota_sdk::utils::serde::option_prefix_hex_vec")]
+    pub metadata: Option<Vec<u8>>,
+}
+
+#[test]
+fn serde_string() {
+    let block_id = BlockId::from_str(BLOCK_ID).unwrap();
+    let test_1 = SerdeStringTest { block_id };
+    let str = serde_json::to_string(&test_1).unwrap();
+    let test_2 = serde_json::from_str(&str).unwrap();
+
+    assert_eq!(test_1, test_2);
+    assert!(str.contains(BLOCK_ID));
+}
+
+#[test]
+fn serde_option_string() {
+    let block_id = BlockId::from_str(BLOCK_ID).unwrap();
+    let test_1 = SerdeOptionStringTest {
+        block_id: Some(block_id),
+    };
+    let str = serde_json::to_string(&test_1).unwrap();
+    let test_2 = serde_json::from_str(&str).unwrap();
+
+    assert_eq!(test_1, test_2);
+    assert!(str.contains(BLOCK_ID));
+
+    let test_1 = SerdeOptionStringTest { block_id: None };
+    let str = serde_json::to_string(&test_1).unwrap();
+    let test_2 = serde_json::from_str(&str).unwrap();
+
+    assert_eq!(test_1, test_2);
+    assert!(str.contains("null"));
+}
+
+#[test]
+fn serde_option_prefix_hex_vec() {
+    let metadata = prefix_hex::decode(BLOCK_ID).unwrap();
+    let test_1 = SerdeOptionPrefixHexVecTest {
+        metadata: Some(metadata),
+    };
+    let str = serde_json::to_string(&test_1).unwrap();
+    let test_2 = serde_json::from_str(&str).unwrap();
+
+    assert_eq!(test_1, test_2);
+    assert!(str.contains(BLOCK_ID));
+
+    let test_1 = SerdeOptionPrefixHexVecTest { metadata: None };
+    let str = serde_json::to_string(&test_1).unwrap();
+    let test_2 = serde_json::from_str(&str).unwrap();
+
+    assert_eq!(test_1, test_2);
+    assert!(str.contains("null"));
+}