diff --git a/server/index.js b/server/index.js
new file mode 100644
index 0000000..7c87d90
--- /dev/null
+++ b/server/index.js
@@ -0,0 +1,221 @@
+/*
+                                   /##                                       /""               /""
+                                  | ##                                      | ""              |__/
+ /#######  /##   /## /######/#### | #######   /######   /######   /""""""" /""""""    /""""""  /"" /"""""""   /""""""
+| ##__  ##| ##  | ##| ##_  ##_  ##| ##__  ## /##__  ## /##__  ## /""_____/|_  ""_/   /""__  ""| ""| ""__  "" /""__  ""
+| ##  \ ##| ##  | ##| ## \ ## \ ##| ##  \ ##| ########| ##  \__/|  """"""   | ""    | ""  \__/| ""| ""  \ ""| ""  \ ""
+| ##  | ##| ##  | ##| ## | ## | ##| ##  | ##| ##_____/| ##       \____  ""  | "" /""| ""      | ""| ""  | ""| ""  | ""
+| ##  | ##|  ######/| ## | ## | ##| #######/|  #######| ##       /"""""""/  |  """"/| ""      | ""| ""  | ""|  """""""
+|__/  |__/ \______/ |__/ |__/ |__/|_______/  \_______/|__/      |_______/    \___/  |__/      |__/|__/  |__/ \____  ""
+                                                                                                             /""  \ ""
+                                                                                                            |  """"""/
+                                                                                                             \______/
+   ___   ___  ___
+  / _ | / _ \/  _/
+ / __ |/ ___// /
+/_/ |_/_/  /___/
+
+*/
+
+/**
+ * numberstring API Server
+ * REST API for number-to-word conversions
+ */
+
+/* global process */
+
+import express from 'express';
+import numberstring, {
+  comma,
+  ordinal,
+  decimal,
+  currency,
+  roman,
+  parse,
+  toWords
+} from '../index.js';
+
+const PORT = process.env.PORT || 3456;
+
+/**
+ * Create and configure the Express app
+ * @returns {express.Application} Configured Express app
+ */
+export const createApp = () => {
+  const app = express();
+  app.use(express.json());
+
+  // Root route
+  app.get('/', (_req, res) => {
+    res.json({
+      name: 'numberstring API',
+      version: '1.0.0',
+      endpoints: [
+        'GET /convert/:number',
+        'GET /ordinal/:number',
+        'GET /decimal/:number',
+        'GET /currency/:amount',
+        'GET /roman/:number',
+        'GET /parse/:words',
+        'GET /comma/:number',
+        'GET /languages'
+      ]
+    });
+  });
+
+  // List supported languages
+  app.get('/languages', (_req, res) => {
+    res.json({
+      languages: [
+        { code: 'en', name: 'English' },
+        { code: 'es', name: 'Spanish (Español)' },
+        { code: 'fr', name: 'French (Français)' },
+        { code: 'de', name: 'German (Deutsch)' },
+        { code: 'da', name: 'Danish (Dansk)' },
+        { code: 'zh', name: 'Chinese (中文)' },
+        { code: 'hi', name: 'Hindi (हिन्दी)' }
+      ]
+    });
+  });
+
+  // Convert number to words
+  // GET /convert/42?lang=en&cap=title
+  app.get('/convert/:number', (req, res) => {
+    const { number } = req.params;
+    const { lang, cap: capStyle, punc } = req.query;
+
+    const num = number.includes('n') ? BigInt(number.replace('n', '')) : parseInt(number, 10);
+
+    const opt = {};
+    if (lang) opt.lang = lang;
+    if (capStyle) opt.cap = capStyle;
+    if (punc) opt.punc = punc;
+
+    const result = lang ? toWords(num, opt) : numberstring(num, opt);
+
+    if (result === false) {
+      res.status(400).json({ error: 'Invalid number', input: number });
+      return;
+    }
+
+    res.json({ input: number, output: result, lang: lang || 'en' });
+  });
+
+  // Convert to ordinal
+  // GET /ordinal/42
+  app.get('/ordinal/:number', (req, res) => {
+    const { number } = req.params;
+    const { cap: capStyle } = req.query;
+
+    const num = parseInt(number, 10);
+    const opt = capStyle ? { cap: capStyle } : undefined;
+    const result = ordinal(num, opt);
+
+    if (result === false) {
+      res.status(400).json({ error: 'Invalid number for ordinal', input: number });
+      return;
+    }
+
+    res.json({ input: number, output: result });
+  });
+
+  // Convert decimal to words
+  // GET /decimal/3.14
+  app.get('/decimal/:number', (req, res) => {
+    const { number } = req.params;
+    const { cap: capStyle, point } = req.query;
+
+    const num = parseFloat(number);
+    const opt = {};
+    if (capStyle) opt.cap = capStyle;
+    if (point) opt.point = point;
+
+    const result = decimal(num, Object.keys(opt).length ? opt : undefined);
+
+    if (result === false) {
+      res.status(400).json({ error: 'Invalid decimal', input: number });
+      return;
+    }
+
+    res.json({ input: number, output: result });
+  });
+
+  // Convert currency to words
+  // GET /currency/$123.45 or GET /currency/123.45?currency=USD
+  app.get('/currency/:amount', (req, res) => {
+    const { amount } = req.params;
+    const { currency: curr, cap: capStyle } = req.query;
+
+    const opt = {};
+    if (curr) opt.currency = curr;
+    if (capStyle) opt.cap = capStyle;
+
+    const result = currency(amount, Object.keys(opt).length ? opt : undefined);
+
+    if (result === false) {
+      res.status(400).json({ error: 'Invalid currency amount', input: amount });
+      return;
+    }
+
+    res.json({ input: amount, output: result });
+  });
+
+  // Convert to Roman numerals
+  // GET /roman/42
+  app.get('/roman/:number', (req, res) => {
+    const { number } = req.params;
+    const { lower } = req.query;
+
+    const num = parseInt(number, 10);
+    const opt = lower === 'true' ? { lower: true } : undefined;
+    const result = roman(num, opt);
+
+    if (result === false) {
+      res.status(400).json({ error: 'Invalid number for roman (1-3999)', input: number });
+      return;
+    }
+
+    res.json({ input: number, output: result });
+  });
+
+  // Parse words to number
+  // GET /parse/forty-two
+  app.get('/parse/:words', (req, res) => {
+    const { words } = req.params;
+    const result = parse(decodeURIComponent(words));
+
+    if (result === false) {
+      res.status(400).json({ error: 'Could not parse words', input: words });
+      return;
+    }
+
+    res.json({ input: words, output: result.toString() });
+  });
+
+  // Format number with commas
+  // GET /comma/1234567
+  app.get('/comma/:number', (req, res) => {
+    const { number } = req.params;
+    const num = number.includes('n') ? BigInt(number.replace('n', '')) : parseInt(number, 10);
+    const result = comma(num);
+
+    if (result === false) {
+      res.status(400).json({ error: 'Invalid number', input: number });
+      return;
+    }
+
+    res.json({ input: number, output: result });
+  });
+
+  return app;
+};
+
+// Start server if run directly
+const app = createApp();
+const server = app.listen(PORT, () => {
+  console.log(`numberstring API listening on port ${PORT}`);
+  console.log(`Try: http://localhost:${PORT}/convert/42`);
+});
+
+export { app, server };
+export default app;
diff --git a/server/package-lock.json b/server/package-lock.json
new file mode 100644
index 0000000..be2c9b2
--- /dev/null
+++ b/server/package-lock.json
@@ -0,0 +1,827 @@
+{
+  "name": "numberstring-api",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "numberstring-api",
+      "version": "1.0.0",
+      "dependencies": {
+        "express": "^4.21.2"
+      }
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+      "license": "MIT",
+      "dependencies": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      },
+      "engines": {
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+      }
+    },
+    "node_modules/array-flatten": {
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+      "license": "MIT"
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diff --git a/server/package.json b/server/package.json
new file mode 100644
index 0000000..087eb1e
--- /dev/null
+++ b/server/package.json
@@ -0,0 +1,13 @@
+{
+  "name": "numberstring-api",
+  "version": "1.0.0",
+  "description": "REST API for numberstring",
+  "type": "module",
+  "main": "index.js",
+  "scripts": {
+    "start": "node index.js"
+  },
+  "dependencies": {
+    "express": "^4.21.2"
+  }
+}