diff --git a/langchain/src/output_parsers/structured.ts b/langchain/src/output_parsers/structured.ts
index a1c3226f7563..1b0e6766945d 100644
--- a/langchain/src/output_parsers/structured.ts
+++ b/langchain/src/output_parsers/structured.ts
@@ -104,15 +104,23 @@ ${JSON.stringify(zodToJsonSchema(this.schema))}
       const json = text.includes("```")
         ? text.trim().split(/```(?:json)?/)[1]
         : text.trim();
+
       return await this.schema.parseAsync(JSON.parse(json));
     } catch (e) {
-      try {
-        return await this.schema.parseAsync(JSON.parse(text.trim()));
-      } catch (e2) {
-        throw new OutputParserException(
-          `Failed to parse. Text: "${text}". Error: ${e2}`,
-          text
-        );
+      // eslint-disable-next-line no-instanceof/no-instanceof
+      if (e instanceof SyntaxError && e.message.includes("JSON")) {
+        // In case the error is JSON.parse related, try to parse the text directly
+        try {
+          return await this.schema.parseAsync(JSON.parse(text.trim()));
+        } catch (e2) {
+          throw new OutputParserException(
+            `Failed to parse. Text: "${text}". Error: ${e2}`,
+            text
+          );
+        }
+      } else {
+        // Otherwise, throw the original error (e.g. ZodError)
+        throw e;
       }
     }
   }
diff --git a/langchain/src/output_parsers/tests/structured.test.ts b/langchain/src/output_parsers/tests/structured.test.ts
index 95970830b3c9..7b408af3bce8 100644
--- a/langchain/src/output_parsers/tests/structured.test.ts
+++ b/langchain/src/output_parsers/tests/structured.test.ts
@@ -99,3 +99,31 @@ test("StructuredOutputParser throws error for JSON with backticks both inside an
 
   await expect(parser.parse(text)).rejects.toThrow("Failed to parse");
 });
+
+test("StructuredOutputParser handles valid JSON without triple backticks not conforming to schema", async () => {
+  const parser = StructuredOutputParser.fromZodSchema(
+    z.object({
+      name: z.string().describe("Human name"),
+      age: z.number().describe("Human age"),
+    })
+  );
+  const text = '{"name": "John Doe", "age": null}';
+
+  await expect(parser.parse(text)).rejects.toThrow(
+    "Expected number, received null"
+  );
+});
+
+test("StructuredOutputParser handles valid JSON with backticks and not conforming to schema", async () => {
+  const parser = StructuredOutputParser.fromZodSchema(
+    z.object({
+      name: z.string().describe("Human name"),
+      age: z.number().describe("Human age"),
+    })
+  );
+  const text = '```json\n{"name": "John Doe", "age": null }```';
+
+  await expect(parser.parse(text)).rejects.toThrow(
+    "Expected number, received null"
+  );
+});