diff --git a/README.md b/README.md
index 9b49a22..6eef227 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,45 @@ To enjoy Rust
 
 ## With Javascript (WebAssembly)
 
-- 
+
+[Demo]: https://freestrings.github.io/jsonpath/
+
+**(not yet published `jsonpath-wasm`)**
+
+```javascript
+import * as jsonpath from "jsonpath-wasm";
+
+//
+// data
+//
+let jsonString = "{\"a\" : 1}";
+
+//
+// reuse a compiled jsonpath
+//
+let template = jsonpath.compile("$.a");
+// read as json string
+template(jsonString)
+// read as json object
+template(JSON.parse(jsonString));
+
+//
+// reuse a json
+//
+
+// as json string
+let reader1 = jsonpath.reader(jsonString);
+reader1("$.a");
+
+// as json object
+let reader2 = jsonpath.reader(JSON.parse(jsonString));
+reader2("$.a");
+
+// read every time
+jsonpath.read(JSON.parse(jsonString), "$.a");
+jsonpath.read(jsonString, "$.a");
+```
+
 
 ## On Shell