diff --git a/forest/__init__.py b/forest/__init__.py
index 8633fd20f..cac220c47 100644
--- a/forest/__init__.py
+++ b/forest/__init__.py
@@ -23,7 +23,7 @@
 .. automodule:: forest.presets
 
 """
-__version__ = '0.16.1'
+__version__ = '0.16.2'
 
 from .config import *
 from . import (
diff --git a/forest/js/forest.js b/forest/js/forest.js
new file mode 100644
index 000000000..1903ce248
--- /dev/null
+++ b/forest/js/forest.js
@@ -0,0 +1,19 @@
+const helloWorld = () => "Hello, World!"
+
+
+// Populate variable options from dataset value
+const link_selects = function(dataset_select, variable_select, source) {
+    let label = dataset_select.value;
+    if (label !== "") {
+        let index = source.data['datasets'].indexOf(label)
+        let defaults = ["Please specify"];
+        variable_select.options = defaults.concat(
+            source.data['variables'][index]);
+    }
+}
+
+
+module.exports = {
+    helloWorld,
+    link_selects
+}
diff --git a/forest/js/forest.test.js b/forest/js/forest.test.js
new file mode 100644
index 000000000..53f395103
--- /dev/null
+++ b/forest/js/forest.test.js
@@ -0,0 +1,8 @@
+const forest = require("./forest")
+
+
+describe("helloWorld", () => {
+    it("should return message", () => {
+        expect(forest.helloWorld()).toEqual("Hello, World!")
+    })
+})
diff --git a/forest/js/main.js b/forest/js/main.js
new file mode 100644
index 000000000..48c9f9722
--- /dev/null
+++ b/forest/js/main.js
@@ -0,0 +1,2 @@
+window.forest = require('./forest')
+
diff --git a/forest/js/package.json b/forest/js/package.json
new file mode 100644
index 000000000..6113c6fb4
--- /dev/null
+++ b/forest/js/package.json
@@ -0,0 +1,20 @@
+{
+  "name": "forestjs",
+  "version": "0.0.1",
+  "description": "Helper JS for FOREST Python library",
+  "main": "index.js",
+  "dependencies": {
+    "redux": "^4.0.5"
+  },
+  "devDependencies": {
+    "browserify": "^16.5.1",
+    "jest": "^26.0.1"
+  },
+  "scripts": {
+    "test": "jest",
+    "watch": "jest --watch ./*.test.js",
+    "build": "browserify main.js -o ../static/forest-min.js"
+  },
+  "author": "andrewgryan",
+  "license": "BSD-3-Clause"
+}
diff --git a/forest/static/script.js b/forest/static/script.js
index e619344c2..06a4d886f 100644
--- a/forest/static/script.js
+++ b/forest/static/script.js
@@ -4,20 +4,3 @@ let openId = function(id) {
 let closeId = function(id) {
     document.getElementById(id).style.width = "0";
 }
-
-let forest = (function() {
-    let ns = {};
-
-    // Populate variable options from dataset value
-    ns.link_selects = function(dataset_select, variable_select, source) {
-        let label = dataset_select.value;
-        if (label !== "") {
-            let index = source.data['datasets'].indexOf(label)
-            let defaults = ["Please specify"];
-            variable_select.options = defaults.concat(
-                source.data['variables'][index]);
-        }
-    }
-
-    return ns;
-})();
diff --git a/forest/templates/index.html b/forest/templates/index.html
index 5301696cc..38351dcf9 100644
--- a/forest/templates/index.html
+++ b/forest/templates/index.html
@@ -14,6 +14,7 @@
 {% block postamble %}
 <link rel="stylesheet" href="forest/static/style.css" type="text/css" media="all">
 <script src="forest/static/script.js" charset="utf-8"></script>
+<script src="forest/static/forest-min.js" charset="utf-8"></script>
 {% endblock %}
 
 {% block contents %}
diff --git a/requirements.txt b/requirements.txt
index 3692acdce..7e6bf95cd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 bokeh>=2.0.1 # Port to 2.0.0 in future
+nodejs>=10.13
 datashader
 h5netcdf
 iris
diff --git a/setup.py b/setup.py
index c3246daac..1c4c6b9ca 100644
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,11 @@
 """
 import os
 import re
+import subprocess
 import setuptools
+import setuptools.command.build_py
+import setuptools.command.develop
+import setuptools.command.install
 
 
 NAME = "forest"
@@ -27,11 +31,57 @@ def load(fname):
     return result
 
 
+def build_js(command_subclass):
+    """Decorator to call npm install and npm run build"""
+    subclass_run = command_subclass.run
+    def run(self):
+        self.run_command("build_js")
+        subclass_run(self)
+    command_subclass.run = run
+    return command_subclass
+
+
+@build_js
+class InstallCommand(setuptools.command.install.install):
+    """Python and JS code"""
+
+
+@build_js
+class DevelopCommand(setuptools.command.develop.develop):
+    """Python and JS code"""
+
+
+@build_js
+class BuildPyCommand(setuptools.command.build_py.build_py):
+    """Python and JS code"""
+
+
+class BuildJSCommand(setuptools.command.build_py.build_py):
+    """Use nodejs and npm commands to browserify forest.js
+
+    .. note:: Assume current working directory is package ROOT
+    """
+    def run(self):
+        cwd = os.getcwd()
+        os.chdir("forest/js")
+        if not os.path.exists("node_modules"):
+            subprocess.check_call(["npm", "install"])
+        subprocess.check_call(["npm", "run", "build"])
+        os.chdir(cwd)
+        super().run()
+
+
 setuptools.setup(
         name=NAME,
         version=find_version(),
         author="Andrew Ryan",
         author_email="andrew.ryan@metoffice.gov.uk",
+        cmdclass={
+            "install": InstallCommand,
+            "develop": DevelopCommand,
+            "build_py": BuildPyCommand,
+            "build_js": BuildJSCommand,
+        },
         description="Forecast visualisation and survey tool",
         packages=setuptools.find_packages(),
         package_data={
diff --git a/test/test_js.py b/test/test_js.py
new file mode 100644
index 000000000..0b897dcfe
--- /dev/null
+++ b/test/test_js.py
@@ -0,0 +1,12 @@
+import os
+import subprocess
+
+
+JS_DIR = os.path.join(os.path.dirname(__file__), "../forest/js")
+
+
+def test_forestjs():
+    cwd = os.getcwd()
+    os.chdir(JS_DIR)
+    subprocess.check_call(["npm", "test"])
+    os.chdir(cwd)