diff --git a/__enclave/virt_enclave/Cargo.lock b/__enclave/virt_enclave/Cargo.lock
index 93270e6..650562a 100644
--- a/__enclave/virt_enclave/Cargo.lock
+++ b/__enclave/virt_enclave/Cargo.lock
@@ -521,6 +521,12 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "json"
+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "078e285eafdfb6c4b434e0d31e8cfcb5115b651496faca5749b88fafd4f23bfd"
+
 [[package]]
 name = "kernel32-sys"
 version = "0.2.2"
@@ -1421,6 +1427,7 @@ name = "virt_enclave"
 version = "0.1.0"
 dependencies = [
  "hex",
+ "json",
  "lazy_static",
  "quick-js",
  "ring",
diff --git a/__enclave/virt_enclave/Cargo.toml b/__enclave/virt_enclave/Cargo.toml
index 9f616a0..2e3ae7f 100644
--- a/__enclave/virt_enclave/Cargo.toml
+++ b/__enclave/virt_enclave/Cargo.toml
@@ -16,3 +16,4 @@ rust_util = "0.6"
 lazy_static = "1.4"
 tokio = { version = "0.2", features = ["full"] }
 warp = "0.2"
+json = "0.12"
diff --git a/__enclave/virt_enclave/src/qjs.rs b/__enclave/virt_enclave/src/qjs.rs
index acbd181..ba43ed8 100644
--- a/__enclave/virt_enclave/src/qjs.rs
+++ b/__enclave/virt_enclave/src/qjs.rs
@@ -46,11 +46,9 @@ impl QuickJSContext {
             '_'
         }).collect();
 
-        // TODO check JSON valid
-        // let v: Option<Vec<EmptyObject>> = serde_json::from_str(params).ok();
-        // if v.is_none() {
-        //     return Err(rust_util::new_box_error("Params is not valid JSON array!"));
-        // }
+        if let Err(e) = json::parse(params) {
+            return Err(rust_util::new_box_error(&format!("Params is not valid JSON array: {}", e)));
+        }
         self.context.eval(&format!("__PUBLIC_{}.apply(null, {})", f, params)).map_err(|e| e.into())
     }
 }