diff --git a/cli/ops/dispatch_json.rs b/cli/ops/dispatch_json.rs
index a575aedb3e1d42..a3c6ab7a76e251 100644
--- a/cli/ops/dispatch_json.rs
+++ b/cli/ops/dispatch_json.rs
@@ -37,7 +37,19 @@ fn serialize_result(
     Ok(v) => json!({ "ok": v, "promiseId": promise_id }),
     Err(err) => json!({ "err": json_err(err), "promiseId": promise_id }),
   };
-  let vec = serde_json::to_vec(&value).unwrap();
+  let mut vec = serde_json::to_vec(&value).unwrap();
+
+  debug!("JSON response pre-align, len={}", vec.len());
+  let modulo = vec.len() % 4;
+
+  if modulo != 0 {
+    let n = 4 - modulo;
+    for _ in 0..n {
+      vec.push(0);
+    }
+  }
+
+  debug!("JSON response post-align, len={}", vec.len());
   vec.into_boxed_slice()
 }
 
diff --git a/core/shared_queue.rs b/core/shared_queue.rs
index 11c8e21271c062..20138fa5643ff1 100644
--- a/core/shared_queue.rs
+++ b/core/shared_queue.rs
@@ -162,6 +162,14 @@ impl SharedQueue {
   pub fn push(&mut self, op_id: OpId, record: &[u8]) -> bool {
     let off = self.head();
     let end = off + record.len();
+    debug!(
+      "rust:shared_queue:pre-push: op={}, off={}, end={}, len={}",
+      op_id,
+      off,
+      end,
+      record.len()
+    );
+    assert_eq!(record.len() % 4, 0);
     let index = self.num_records();
     if end > self.bytes.len() || index >= MAX_RECORDS {
       debug!("WARNING the sharedQueue overflowed");
diff --git a/js/dispatch_json.ts b/js/dispatch_json.ts
index e8c97616454ce4..fc02131e5e632d 100644
--- a/js/dispatch_json.ts
+++ b/js/dispatch_json.ts
@@ -30,7 +30,10 @@ function nextPromiseId(): number {
 }
 
 function decode(ui8: Uint8Array): JsonResponse {
-  const s = new TextDecoder().decode(ui8);
+  let s = new TextDecoder().decode(ui8);
+  // TODO: this is make-shift solution
+  const closingBracket = s.lastIndexOf("}");
+  s = s.slice(0, closingBracket + 1);
   return JSON.parse(s) as JsonResponse;
 }
 
diff --git a/tools/http_benchmark.py b/tools/http_benchmark.py
index e3674d0954420a..2394ad160fd544 100755
--- a/tools/http_benchmark.py
+++ b/tools/http_benchmark.py
@@ -28,7 +28,7 @@ def get_addr(port=None):
 def deno_tcp(deno_exe):
     addr = get_addr()
     deno_cmd = [deno_exe, "run", "--allow-net", "tools/deno_tcp.ts", addr]
-    print "http_benchmark testing DENO."
+    print "http_benchmark testing DENO tcp."
     return run(deno_cmd, addr)
 
 
@@ -38,7 +38,7 @@ def deno_tcp_current_thread(deno_exe):
         deno_exe, "run", "--current-thread", "--allow-net",
         "tools/deno_tcp.ts", addr
     ]
-    print "http_benchmark testing DENO."
+    print "http_benchmark testing DENO tcp (single-thread)."
     return run(deno_cmd, addr)