diff --git a/README.md b/README.md
index e9aa0d0..2b6d87c 100644
--- a/README.md
+++ b/README.md
@@ -51,6 +51,13 @@ document.addEventListener("libcurl_load", ()=>{
 });
 ```
 
+Alternatively, the `libcurl.onload` callback can be used.
+```js
+libcurl.onload = () => {
+  console.log("libcurl.js ready!");
+}
+```
+
 Once loaded, there will be a `window.libcurl` object which includes all the API functions. The `libcurl.ready` property can also be used to know if the WASM has loaded.
 
 ### Making HTTP Requests:
diff --git a/client/javascript/main.js b/client/javascript/main.js
index 8d47418..211f7d3 100644
--- a/client/javascript/main.js
+++ b/client/javascript/main.js
@@ -30,6 +30,7 @@ var event_loop = null;
 var active_requests = 0;
 var wasm_ready = false;
 var version_dict = null;
+var api = null;
 const libcurl_version = "__library_version__";
 
 function check_loaded(check_websocket) {
@@ -231,7 +232,7 @@ async function libcurl_fetch(url, params={}) {
 
 function set_websocket_url(url) {
   websocket_url = url;
-  if (!Module.websocket) {
+  if (!Module.websocket && ENVIRONMENT_IS_WEB) {
     document.addEventListener("libcurl_load", () => {
       set_websocket_url(url);
     });
@@ -256,8 +257,11 @@ function main() {
   _init_curl();
   set_websocket_url(websocket_url);
 
-  let load_event = new Event("libcurl_load");
-  document.dispatchEvent(load_event);
+  if (ENVIRONMENT_IS_WEB) {
+    let load_event = new Event("libcurl_load");
+    document.dispatchEvent(load_event);
+  }
+  api.onload();
 }
 
 function load_wasm(url) {
@@ -267,7 +271,7 @@ function load_wasm(url) {
 }
 
 Module.onRuntimeInitialized = main;
-return {
+api = {
   fetch: libcurl_fetch,
   set_websocket: set_websocket_url,
   load_wasm: load_wasm,
@@ -286,6 +290,10 @@ return {
   set stdout(callback) {out = callback},
   get stderr() {return err},
   set stderr(callback) {err = callback},
-}
+
+  onload() {}
+};
+
+return api;
 
 })()
\ No newline at end of file
diff --git a/client/worker.html b/client/worker.html
new file mode 100644
index 0000000..6cf3096
--- /dev/null
+++ b/client/worker.html
@@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <link rel="icon" href="data:;base64,=">
+    <script id="worker1" type="javascript/worker">
+      importScripts(`${location.origin}/out/libcurl.js`);
+      async function main() {
+        libcurl.set_websocket(`${location.origin.replace("http", "ws")}/`);
+        self.postMessage("loaded libcurl.js v" + libcurl.version.lib);
+        let r = await libcurl.fetch("https://ifconfig.me/all", {_libcurl_verbose: 1});
+        self.postMessage(await r.text());
+      }
+
+      libcurl.onload = main;
+      libcurl.stdout = self.postMessage;
+      libcurl.stderr = self.postMessage;
+      libcurl.load_wasm(`${location.origin}/out/libcurl.wasm`);
+    </script>
+    <script>
+      var blob = new Blob([
+        document.querySelector('#worker1').textContent
+      ], {type: "text/javascript"});
+    
+      var worker = new Worker(window.URL.createObjectURL(blob));
+      worker.onmessage = function(e) {
+        console.log("Received: " + e.data);
+      }
+    </script>
+  </head>
+  <body>
+    <p>emscripten tests</p>
+  </body>
+</html>
\ No newline at end of file
