diff --git a/deno_wasm_qr/decodeqr/Cargo.lock b/deno_wasm_qr/decodeqr/Cargo.lock
new file mode 100644
index 0000000..cd75747
--- /dev/null
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diff --git a/deno_wasm_qr/decodeqr/Cargo.toml b/deno_wasm_qr/decodeqr/Cargo.toml
new file mode 100644
index 0000000..5c482ba
--- /dev/null
+++ b/deno_wasm_qr/decodeqr/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "decodeqr"
+version = "0.1.0"
+authors = ["Hatter Jiang <jht5945@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+crate-type =["cdylib"]
+
+[dependencies]
+bardecoder = "0.2.2"
+image = "0.22"
+
+[profile.release]
+lto = true
+#opt-level = 'z'
diff --git a/deno_wasm_qr/decodeqr/build.sh b/deno_wasm_qr/decodeqr/build.sh
new file mode 100644
index 0000000..b878198
--- /dev/null
+++ b/deno_wasm_qr/decodeqr/build.sh
@@ -0,0 +1 @@
+cargo build --target wasm32-unknown-unknown
diff --git a/deno_wasm_qr/decodeqr/src/lib.rs b/deno_wasm_qr/decodeqr/src/lib.rs
new file mode 100644
index 0000000..c4073e7
--- /dev/null
+++ b/deno_wasm_qr/decodeqr/src/lib.rs
@@ -0,0 +1,25 @@
+use std::ffi::CString;
+use std::os::raw::c_char;
+
+pub const SAMPLE_QR_BYTES: &[u8] = std::include_bytes!("sample_qr.png");
+
+#[no_mangle]
+pub extern "C" fn parse_default_qr() -> *mut c_char {
+    let s = CString::new(parse_qr()).unwrap();
+    s.into_raw()
+}
+
+pub fn parse_qr() -> String {
+    let img = image::load_from_memory(SAMPLE_QR_BYTES).unwrap();
+
+    let decoder = bardecoder::default_decoder();
+
+    let mut ret = vec![];
+    let results = decoder.decode(&img);
+    for result in results {
+        let qr = result.unwrap();
+        println!("{}", qr);
+        ret.push(qr);
+    }
+    ret.join(",")
+}
diff --git a/deno_wasm_qr/decodeqr/src/sample_qr.png b/deno_wasm_qr/decodeqr/src/sample_qr.png
new file mode 100644
index 0000000..e89f932
Binary files /dev/null and b/deno_wasm_qr/decodeqr/src/sample_qr.png differ
diff --git a/deno_wasm_qr/parse_qr.ts b/deno_wasm_qr/parse_qr.ts
new file mode 100644
index 0000000..cee1a5b
--- /dev/null
+++ b/deno_wasm_qr/parse_qr.ts
@@ -0,0 +1,14 @@
+const wasmCode = await Deno.readFile("./decodeqr/target/wasm32-unknown-unknown/release/decodeqr.wasm");
+const wasmModule = new WebAssembly.Module(wasmCode);
+const wasmInstance = new WebAssembly.Instance(wasmModule);
+
+const linearMemory = wasmInstance.exports.memory;
+
+function readString(memory, ptr) {
+    const mem = new Uint8Array(memory.buffer, ptr);
+    let length;
+    for (length = 0; mem[length] !== 0; length ++);
+    return new TextDecoder("utf-8").decode(new Uint8Array(mem.buffer, ptr, length));
+}
+
+console.log(readString(linearMemory, wasmInstance.exports.parse_default_qr()));
\ No newline at end of file