diff --git a/cli/msg.fbs b/cli/msg.fbs
index 4eafe31ba5f2de..1827b23670e387 100644
--- a/cli/msg.fbs
+++ b/cli/msg.fbs
@@ -72,8 +72,6 @@ union Any {
   Truncate,
   HomeDir,
   HomeDirRes,
-  ExecPath,
-  ExecPathRes,
   Utime,
   WorkerGetMessage,
   WorkerGetMessageRes,
@@ -454,12 +452,6 @@ table HomeDirRes {
   path: string;
 }
 
-table ExecPath {}
-
-table ExecPathRes {
-  path: string;
-}
-
 table Utime {
   filename: string;
   atime: uint64;
diff --git a/cli/ops/dispatch_flatbuffers.rs b/cli/ops/dispatch_flatbuffers.rs
index c5ca61d6bf47a0..98a6153b3a10f1 100644
--- a/cli/ops/dispatch_flatbuffers.rs
+++ b/cli/ops/dispatch_flatbuffers.rs
@@ -17,7 +17,7 @@ use super::fs::{
 };
 use super::metrics::op_metrics;
 use super::net::{op_accept, op_dial, op_listen, op_shutdown};
-use super::os::{op_exec_path, op_home_dir, op_set_env, op_start};
+use super::os::{op_home_dir, op_set_env, op_start};
 use super::performance::op_now;
 use super::permissions::{op_permissions, op_revoke_permission};
 use super::process::{op_kill, op_run, op_run_status};
@@ -160,7 +160,6 @@ pub fn op_selector_std(inner_type: msg::Any) -> Option<CliDispatchFn> {
     msg::Any::CreateWorker => Some(op_create_worker),
     msg::Any::Cwd => Some(op_cwd),
     msg::Any::Dial => Some(op_dial),
-    msg::Any::ExecPath => Some(op_exec_path),
     msg::Any::Fetch => Some(op_fetch),
     msg::Any::FetchSourceFile => Some(op_fetch_source_file),
     msg::Any::FormatError => Some(op_format_error),
diff --git a/cli/ops/mod.rs b/cli/ops/mod.rs
index 9d1b096526bd34..f013381ff5df21 100644
--- a/cli/ops/mod.rs
+++ b/cli/ops/mod.rs
@@ -32,6 +32,7 @@ pub const OP_WRITE: OpId = 2;
 pub const OP_EXIT: OpId = 3;
 pub const OP_IS_TTY: OpId = 4;
 pub const OP_ENV: OpId = 5;
+pub const OP_EXEC_PATH: OpId = 6;
 
 pub fn dispatch(
   state: &ThreadSafeState,
@@ -54,6 +55,9 @@ pub fn dispatch(
       dispatch_json::dispatch(os::op_is_tty, state, control, zero_copy)
     }
     OP_ENV => dispatch_json::dispatch(os::op_env, state, control, zero_copy),
+    OP_EXEC_PATH => {
+      dispatch_json::dispatch(os::op_exec_path, state, control, zero_copy)
+    }
     OP_FLATBUFFER => dispatch_flatbuffers::dispatch(state, control, zero_copy),
     _ => panic!("bad op_id"),
   };
diff --git a/cli/ops/os.rs b/cli/ops/os.rs
index 99b03c720ea6e4..af635140d67047 100644
--- a/cli/ops/os.rs
+++ b/cli/ops/os.rs
@@ -110,32 +110,16 @@ pub fn op_home_dir(
 
 pub fn op_exec_path(
   state: &ThreadSafeState,
-  base: &msg::Base<'_>,
-  data: Option<PinnedBuf>,
-) -> CliOpResult {
-  assert!(data.is_none());
-  let cmd_id = base.cmd_id();
-
+  _args: Value,
+  _zero_copy: Option<PinnedBuf>,
+) -> Result<JsonOp, ErrBox> {
   state.check_env()?;
-
-  let builder = &mut FlatBufferBuilder::new();
   let current_exe = std::env::current_exe().unwrap();
-  // Now apply URL parser to current exe to get fully resolved path, otherwise we might get
-  // `./` and `../` bits in `exec_path`
+  // Now apply URL parser to current exe to get fully resolved path, otherwise
+  // we might get `./` and `../` bits in `exec_path`
   let exe_url = Url::from_file_path(current_exe).unwrap();
-  let path = exe_url.to_file_path().unwrap().to_str().unwrap().to_owned();
-  let path = Some(builder.create_string(&path));
-  let inner = msg::ExecPathRes::create(builder, &msg::ExecPathResArgs { path });
-
-  ok_buf(serialize_response(
-    cmd_id,
-    builder,
-    msg::BaseArgs {
-      inner: Some(inner.as_union_value()),
-      inner_type: msg::Any::ExecPathRes,
-      ..Default::default()
-    },
-  ))
+  let path = exe_url.to_file_path().unwrap();
+  Ok(JsonOp::Sync(json!(path)))
 }
 
 pub fn op_set_env(
diff --git a/js/dispatch.ts b/js/dispatch.ts
index 6ad54891dc7538..4b3fbdc780ac24 100644
--- a/js/dispatch.ts
+++ b/js/dispatch.ts
@@ -10,6 +10,7 @@ export const OP_WRITE = 2;
 export const OP_EXIT = 3;
 export const OP_IS_TTY = 4;
 export const OP_ENV = 5;
+export const OP_EXEC_PATH = 6;
 
 export function handleAsyncMsgFromRust(opId: number, ui8: Uint8Array): void {
   switch (opId) {
@@ -23,6 +24,7 @@ export function handleAsyncMsgFromRust(opId: number, ui8: Uint8Array): void {
     case OP_EXIT:
     case OP_IS_TTY:
     case OP_ENV:
+    case OP_EXEC_PATH:
       json.handleAsyncMsgFromRust(opId, ui8);
       break;
     default:
diff --git a/js/dispatch_json.ts b/js/dispatch_json.ts
index f8c739682e6c4d..af010a196d7ea7 100644
--- a/js/dispatch_json.ts
+++ b/js/dispatch_json.ts
@@ -13,7 +13,7 @@ function nextPromiseId(): number {
 }
 */
 
-export function handleAsyncMsgFromRust(opId: number, ui8: Uint8Array): void {
+export function handleAsyncMsgFromRust(_opId: number, _ui8: Uint8Array): void {
   return util.unreachable();
   /*
   const { promiseId, result } = record;
@@ -23,8 +23,9 @@ export function handleAsyncMsgFromRust(opId: number, ui8: Uint8Array): void {
   */
 }
 
-export function sendSync(opId: number, obj: object = {}): undefined | object {
-  const s = JSON.stringify(obj);
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export function sendSync(opId: number, req: any): any {
+  const s = JSON.stringify(req);
   const msg = new TextEncoder().encode(s);
   const resUi8 = core.dispatch(opId, msg);
   if (!resUi8) {
diff --git a/js/os.ts b/js/os.ts
index a6d7a3747e3e10..d874340ed37e86 100644
--- a/js/os.ts
+++ b/js/os.ts
@@ -24,7 +24,7 @@ function setGlobals(pid_: number, noColor_: boolean): void {
  *       console.log(Deno.isTTY().stdout);
  */
 export function isTTY(): { stdin: boolean; stdout: boolean; stderr: boolean } {
-  return dispatchJson.sendSync(dispatch.OP_IS_TTY) as any;
+  return dispatchJson.sendSync(dispatch.OP_IS_TTY);
 }
 
 /** Exit the Deno process with optional exit code. */
@@ -45,7 +45,7 @@ export function exit(code = 0): never {
  *       console.log(myEnv.TEST_VAR == newEnv.TEST_VAR);
  */
 export function env(): { [index: string]: string } {
-  return dispatchJson.sendSync(dispatch.OP_ENV) as any;
+  return dispatchJson.sendSync(dispatch.OP_ENV);
 }
 
 /** Send to the privileged side that we have setup and are ready. */
@@ -119,12 +119,5 @@ export function homeDir(): string {
  * Requires the `--allow-env` flag.
  */
 export function execPath(): string {
-  const builder = flatbuffers.createBuilder();
-  const inner = msg.ExecPath.createExecPath(builder);
-  const baseRes = sendSync(builder, msg.Any.ExecPath, inner)!;
-  assert(msg.Any.ExecPathRes === baseRes.innerType());
-  const res = new msg.ExecPathRes();
-  assert(baseRes.inner(res) != null);
-  const path = res.path()!;
-  return path;
+  return dispatchJson.sendSync(dispatch.OP_EXEC_PATH);
 }