diff --git a/bin/dune b/bin/dune
index 673a664..59f7311 100644
--- a/bin/dune
+++ b/bin/dune
@@ -1,6 +1,7 @@
 (executable
  (public_name react_trace)
  (name main)
+ (modes exe js)
  (preprocess
   (pps ppx_jane))
  (libraries react_trace base logs logs.fmt fmt fmt.tty))
diff --git a/dune b/dune
new file mode 100644
index 0000000..f406b83
--- /dev/null
+++ b/dune
@@ -0,0 +1,7 @@
+(env
+ (_
+  (js_of_ocaml
+   (flags
+    (:standard --enable effects))
+   (build_runtime_flags
+    (:standard --enable effects)))))
diff --git a/dune-project b/dune-project
index 501a7b7..b50717b 100644
--- a/dune-project
+++ b/dune-project
@@ -27,6 +27,7 @@
   (ocaml-base-compiler
    (= 5.2.0))
   core
+  js_of_ocaml-compiler
   flow_parser
   fmt
   logs
diff --git a/react_trace.opam b/react_trace.opam
index bfccabe..ad117f2 100644
--- a/react_trace.opam
+++ b/react_trace.opam
@@ -13,6 +13,7 @@ depends: [
   "dune" {>= "3.15"}
   "ocaml-base-compiler" {= "5.2.0"}
   "core"
+  "js_of_ocaml-compiler"
   "flow_parser"
   "fmt"
   "logs"