diff --git a/Dockerfile b/Dockerfile
index bd2dea33..3c212cde 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,9 +2,6 @@
 # This image is around 50 megabytes
 FROM node:18-alpine3.18 AS builder
 
-# Environment variable generation script needs bash
-RUN apk add --no-cache bash
-
 # Create app directory
 WORKDIR /app
 
@@ -18,7 +15,7 @@ RUN npm ci --verbose
 RUN npm run build
 
 # Create environment variable js file
-RUN chmod +x env.sh && ./env.sh
+RUN node generate-env-browser.js
 
 ### STAGE 2: Run ###
 # This image is around 5 megabytes
diff --git a/env.sh b/env.sh
deleted file mode 100755
index 823f950d..00000000
--- a/env.sh
+++ /dev/null
@@ -1,30 +0,0 @@
-#!/bin/bash
-# (c) https://github.com/kunokdev/cra-runtime-environment-variables/blob/master/env.sh
-
-# Recreate config file
-rm -rf ./env-config.js
-touch ./env-config.js
-
-# Add assignment 
-echo "window._env_ = {" >> ./env-config.js
-
-# Read each line in .env file
-# Each line represents key=value pairs
-while read -r line || [[ -n "$line" ]];
-do
-  # Split env variables by character `=`
-  if printf '%s\n' "$line" | grep -q -e '='; then
-    varname=$(printf '%s\n' "$line" | sed -e 's/=.*//')
-    varvalue=$(printf '%s\n' "$line" | sed -e 's/^[^=]*=//')
-  fi
-
-  # Read value of current variable if exists as Environment variable
-  value=$(printf '%s\n' "${!varname}")
-  # Otherwise use value from .env file
-  [[ -z $value ]] && value=${varvalue}
-  
-  # Append configuration property to JS file
-  echo "  $varname: \"$value\"," >> ./env-config.js
-done < .env
-
-echo "}" >> ./env-config.js
\ No newline at end of file
diff --git a/generate-env-browser.js b/generate-env-browser.js
new file mode 100755
index 00000000..663dfc00
--- /dev/null
+++ b/generate-env-browser.js
@@ -0,0 +1,43 @@
+import fs from "node:fs";
+import process from "node:process";
+
+const JS_FILE = "env-config.js";
+const ENV_FILE = ".env";
+
+// Remove existing config file
+if (fs.existsSync(JS_FILE)) {
+  fs.unlinkSync(JS_FILE);
+}
+// Create new file
+fs.writeFileSync(JS_FILE, "", "utf-8");
+
+// Add assignment
+fs.appendFileSync(JS_FILE, "window._env_ = {\n");
+
+// Read each line in .env file
+// Each line represents key=value pairs
+const envFile = fs.readFileSync(ENV_FILE, "utf-8");
+const lines = envFile.split("\n");
+
+lines.forEach((line) => {
+  // Ignore comments, lines starting with hash
+  if (line.startsWith("#")) {
+    return;
+  }
+  // Split env variables by character `=`
+  if (line.includes("=")) {
+    const [varname, varvalue] = line.split("=");
+
+    // Read value of current variable if exists as Environment variable
+    let value = process.env[varname] || varvalue;
+    // Otherwise use value from .env file
+    if (typeof value === "undefined") {
+      value = varvalue;
+    }
+
+    // Append configuration property to JS file
+    fs.appendFileSync(JS_FILE, `  ${varname}: "${value}",\n`);
+  }
+});
+
+fs.appendFileSync(JS_FILE, "};");
diff --git a/package.json b/package.json
index b20f8884..4bc13a5e 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
         "use-image": "^1.1.1"
     },
     "scripts": {
-        "start": "chmod +x ./env.sh && sh ./env.sh && cp env-config.js ./public/ && vite",
+        "start": "node generate-env-browser.js && cp env-config.js ./public/ && vite",
         "test": "jest",
         "build": "vite build",
         "lint": "eslint --ignore-path .gitignore . --ext .ts,.tsx,.jsx,.js",