diff --git a/CHANGELOG.md b/CHANGELOG.md
index 214b2531..c2719e44 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 ### Unreleased
 
+- Add support for custom JavaScript tracer to `debug_traceCall` and `debug_traceTransaction` [#2064](https://github.com/gakonst/ethers-rs/pull/2064)
 - Add a `Send` bound to the `IntoFuture` implementation of `ContractCall` [#2083](https://github.com/gakonst/ethers-rs/pull/2083)
 - Bump [`svm-rs`](https://github.com/roynalnaruto/svm-rs) dependency to fix conflicts with Rust Crytpo packages [#2051](https://github.com/gakonst/ethers-rs/pull/2051)
 - Avoid unnecessary allocations in `utils` [#2046](https://github.com/gakonst/ethers-rs/pull/2046)
diff --git a/ethers-core/src/types/trace/geth.rs b/ethers-core/src/types/trace/geth.rs
index c346a299..ededdadb 100644
--- a/ethers-core/src/types/trace/geth.rs
+++ b/ethers-core/src/types/trace/geth.rs
@@ -1,17 +1,18 @@
 use crate::{
-    types::{Bytes, H256, U256},
+    types::{Address, Bytes, NameOrAddress, H256, U256},
     utils::from_int_or_hex,
 };
-use serde::{Deserialize, Serialize, Serializer};
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
 use std::collections::BTreeMap;
 
 // https://github.com/ethereum/go-ethereum/blob/a9ef135e2dd53682d106c6a2aede9187026cc1de/eth/tracers/logger/logger.go#L406-L411
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
-pub struct GethTrace {
+pub struct DefaultFrame {
     pub failed: bool,
     #[serde(deserialize_with = "from_int_or_hex")]
     pub gas: U256,
-    #[serde(serialize_with = "serialize_bytes", rename = "returnValue")]
+    #[serde(rename = "returnValue")]
     pub return_value: Bytes,
     #[serde(rename = "structLogs")]
     pub struct_logs: Vec<StructLog>,
@@ -21,34 +22,83 @@ pub struct GethTrace {
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub struct StructLog {
     pub depth: u64,
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[serde(default, skip_serializing_if = "Option::is_none")]
     pub error: Option<String>,
     pub gas: u64,
     #[serde(rename = "gasCost")]
     pub gas_cost: u64,
     /// ref <https://github.com/ethereum/go-ethereum/blob/366d2169fbc0e0f803b68c042b77b6b480836dbc/eth/tracers/logger/logger.go#L450-L452>
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[serde(default, skip_serializing_if = "Option::is_none")]
     pub memory: Option<Vec<String>>,
     pub op: String,
     pub pc: u64,
-    #[serde(rename = "refund", skip_serializing_if = "Option::is_none")]
+    #[serde(default, rename = "refund", skip_serializing_if = "Option::is_none")]
     pub refund_counter: Option<u64>,
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[serde(default, skip_serializing_if = "Option::is_none")]
     pub stack: Option<Vec<U256>>,
-    #[serde(skip_serializing_if = "Option::is_none")]
+    #[serde(default, skip_serializing_if = "Option::is_none")]
     pub storage: Option<BTreeMap<H256, H256>>,
 }
 
+// https://github.com/ethereum/go-ethereum/blob/a9ef135e2dd53682d106c6a2aede9187026cc1de/eth/tracers/native/call.go#L37
+#[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
+pub struct CallFrame {
+    #[serde(rename = "type")]
+    pub typ: String,
+    pub from: Address,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub to: Option<NameOrAddress>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub value: Option<U256>,
+    #[serde(deserialize_with = "from_int_or_hex")]
+    pub gas: U256,
+    #[serde(deserialize_with = "from_int_or_hex", rename = "gasUsed")]
+    pub gas_used: U256,
+    pub input: Bytes,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub output: Option<Bytes>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub error: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub calls: Option<Vec<CallFrame>>,
+}
+
 #[derive(Debug, PartialEq, Eq, Clone, Deserialize, Serialize)]
+#[serde(untagged)]
+pub enum GethTraceFrame {
+    Default(DefaultFrame),
+    CallTracer(CallFrame),
+}
+
+#[derive(Debug, PartialEq, Eq, Clone, Deserialize, Serialize)]
+#[serde(untagged)]
+pub enum GethTrace {
+    Known(GethTraceFrame),
+    Unknown(Value),
+}
+
 /// Available built-in tracers
 ///
 /// See <https://geth.ethereum.org/docs/developers/evm-tracing/built-in-tracers>
-pub enum GethDebugTracerType {
-    /// callTracer (native)
+#[derive(Debug, PartialEq, Eq, Clone, Deserialize, Serialize)]
+pub enum GethDebugBuiltInTracerType {
     #[serde(rename = "callTracer")]
     CallTracer,
 }
 
+/// Available tracers
+///
+/// See <https://geth.ethereum.org/docs/developers/evm-tracing/built-in-tracers> and <https://geth.ethereum.org/docs/developers/evm-tracing/custom-tracer>
+#[derive(Debug, PartialEq, Eq, Clone, Deserialize, Serialize)]
+#[serde(untagged)]
+pub enum GethDebugTracerType {
+    /// built-in tracer
+    BuiltInTracer(GethDebugBuiltInTracerType),
+
+    /// custom JS tracer
+    JsTracer(String),
+}
+
 /// Bindings for additional `debug_traceTransaction` options
 ///
 /// See <https://geth.ethereum.org/docs/rpc/ns-debug#debug_tracetransaction>
@@ -79,11 +129,3 @@ pub struct GethDebugTracingCallOptions {
     pub tracing_options: GethDebugTracingOptions,
     // TODO: Add stateoverrides and blockoverrides options
 }
-
-fn serialize_bytes<S, T>(x: T, s: S) -> Result<S::Ok, S::Error>
-where
-    S: Serializer,
-    T: AsRef<[u8]>,
-{
-    s.serialize_str(&hex::encode(x.as_ref()))
-}
diff --git a/examples/transactions/examples/trace.rs b/examples/transactions/examples/trace.rs
deleted file mode 100644
index 35ea370d..00000000
--- a/examples/transactions/examples/trace.rs
+++ /dev/null
@@ -1,22 +0,0 @@
-use ethers::{
-    core::types::{GethDebugTracingOptions, H256},
-    providers::{Http, Middleware, Provider},
-};
-use eyre::Result;
-use std::str::FromStr;
-
-/// use `debug_traceTransaction` to fetch traces
-/// requires, a valid endpoint in `RPC_URL` env var that supports `debug_traceTransaction`
-#[tokio::main]
-async fn main() -> Result<()> {
-    if let Ok(url) = std::env::var("RPC_URL") {
-        let client = Provider::<Http>::try_from(url)?;
-        let tx_hash = "0x97a02abf405d36939e5b232a5d4ef5206980c5a6661845436058f30600c52df7";
-        let h: H256 = H256::from_str(tx_hash)?;
-        let options: GethDebugTracingOptions = GethDebugTracingOptions::default();
-        let traces = client.debug_trace_transaction(h, options).await?;
-        println!("{traces:?}");
-    }
-
-    Ok(())
-}
diff --git a/examples/geth_trace_call.rs b/examples/transactions/examples/trace_call.rs
similarity index 74%
rename from examples/geth_trace_call.rs
rename to examples/transactions/examples/trace_call.rs
index 00851951..67551d6e 100644
--- a/examples/geth_trace_call.rs
+++ b/examples/transactions/examples/trace_call.rs
@@ -1,4 +1,11 @@
-use ethers::prelude::*;
+use ethers::{
+    core::types::GethDebugTracingOptions,
+    providers::{Http, Middleware, Provider},
+    types::{
+        Address, BlockId, Bytes, GethDebugBuiltInTracerType, GethDebugTracerType,
+        GethDebugTracingCallOptions, TransactionRequest,
+    },
+};
 use eyre::Result;
 use std::str::FromStr;
 
@@ -14,7 +21,9 @@ async fn main() -> Result<()> {
             tracing_options: GethDebugTracingOptions {
                 disable_storage: Some(true),
                 enable_memory: Some(false),
-                tracer: Some(GethDebugTracerType::CallTracer),
+                tracer: Some(GethDebugTracerType::BuiltInTracer(
+                    GethDebugBuiltInTracerType::CallTracer,
+                )),
                 ..Default::default()
             },
         };
diff --git a/examples/transactions/examples/trace_transaction.rs b/examples/transactions/examples/trace_transaction.rs
new file mode 100644
index 00000000..028e4162
--- /dev/null
+++ b/examples/transactions/examples/trace_transaction.rs
@@ -0,0 +1,47 @@
+use ethers::{
+    core::types::{GethDebugTracingOptions, H256},
+    providers::{Http, Middleware, Provider},
+    types::{GethDebugBuiltInTracerType, GethDebugTracerType},
+};
+use eyre::Result;
+use std::str::FromStr;
+
+/// use `debug_traceTransaction` to fetch traces
+/// requires, a valid endpoint in `RPC_URL` env var that supports `debug_traceTransaction`
+#[tokio::main]
+async fn main() -> Result<()> {
+    if let Ok(url) = std::env::var("RPC_URL") {
+        let client = Provider::<Http>::try_from(url)?;
+        let tx_hash = "0x97a02abf405d36939e5b232a5d4ef5206980c5a6661845436058f30600c52df7";
+        let h: H256 = H256::from_str(tx_hash)?;
+
+        // default tracer
+        let options = GethDebugTracingOptions::default();
+        let traces = client.debug_trace_transaction(h, options).await?;
+        println!("{traces:?}");
+
+        // call tracer
+        let options = GethDebugTracingOptions {
+            disable_storage: Some(true),
+            enable_memory: Some(false),
+            tracer: Some(GethDebugTracerType::BuiltInTracer(
+                GethDebugBuiltInTracerType::CallTracer,
+            )),
+            ..Default::default()
+        };
+        let traces = client.debug_trace_transaction(h, options).await?;
+        println!("{traces:?}");
+
+        // js tracer
+        let options = GethDebugTracingOptions {
+                disable_storage: Some(true),
+                enable_memory: Some(false),
+                tracer: Some(GethDebugTracerType::JsTracer(String::from("{data: [], fault: function(log) {}, step: function(log) { if(log.op.toString() == \"DELEGATECALL\") this.data.push(log.stack.peek(0)); }, result: function() { return this.data; }}"))),
+                ..Default::default()
+            };
+        let traces = client.debug_trace_transaction(h, options).await?;
+        println!("{traces:?}");
+    }
+
+    Ok(())
+}