diff --git a/django/aiservice/core/languages/js_ts/testgen.py b/django/aiservice/core/languages/js_ts/testgen.py
index 9654379e7..beda0f485 100644
--- a/django/aiservice/core/languages/js_ts/testgen.py
+++ b/django/aiservice/core/languages/js_ts/testgen.py
@@ -56,6 +56,15 @@ JS_PATTERN = re.compile(r"^```(?:javascript|js|typescript|ts)?\s*\n(.*?)\n```",
 JS_IDENTIFIER_PATTERN = re.compile(r"^[a-zA-Z_$][a-zA-Z0-9_$]*$")
 
 
+_MARKDOWN_CODE_BLOCK_RE = re.compile(r"^```[^\n]*\n(.*?)\n```", re.MULTILINE | re.DOTALL)
+
+
+def _extract_code_blocks_from_markdown(source: str) -> list[str]:
+    """Extract code from markdown code blocks, or return source as-is if not markdown."""
+    blocks = _MARKDOWN_CODE_BLOCK_RE.findall(source)
+    return blocks if blocks else [source]
+
+
 def _is_valid_js_identifier(name: str) -> bool:
     """Check if a name is a valid JavaScript identifier (not a reserved word).
 
@@ -464,16 +473,18 @@ def validate_javascript_testgen_request_data(data: TestGenSchema) -> None:
     if not validate_trace_id(data.trace_id):
         raise HttpError(400, "Invalid trace ID. Please provide a valid UUIDv4.")
 
-    # Validate syntax based on language
-    if data.language == "typescript":
-        is_valid, error = validate_typescript_syntax(data.source_code_being_tested)
-        lang_name = "TypeScript"
-    else:
-        is_valid, error = validate_javascript_syntax(data.source_code_being_tested)
-        lang_name = "JavaScript"
-
-    if not is_valid:
-        raise HttpError(400, f"Invalid source code. It is not valid {lang_name}: {error}")
+    # Validate syntax of each code block (source may be markdown-formatted with ```lang:file blocks)
+    source = data.source_code_being_tested
+    code_blocks = _extract_code_blocks_from_markdown(source)
+    for block in code_blocks:
+        if data.language == "typescript":
+            is_valid, error = validate_typescript_syntax(block)
+            lang_name = "TypeScript"
+        else:
+            is_valid, error = validate_javascript_syntax(block)
+            lang_name = "JavaScript"
+        if not is_valid:
+            raise HttpError(400, f"Invalid source code. It is not valid {lang_name}: {error}")
 
 
 async def testgen_javascript(