diff --git a/index.js b/index.js
index 47b7e31..12c836d 100644
--- a/index.js
+++ b/index.js
@@ -12,7 +12,35 @@ const app = express();
 const port = process.env.PORT || 3000; // Use Codespaces port
 
 app.get("/", (req, res) => {
-  res.json({ message: "Hello from Express!" });
+  res.send("Specify  /add?x=val1&y=val2, /subtract?x=val1&y=val2, etc.");
+});
+app.get("/add", (req, res) => {
+  let sum = parseFloat(req.query.x) + parseFloat(req.query.y);
+  res.json({operation: `${req.query.x} + ${req.query.y}`, sum: sum});
+});
+app.get("/sub", (req, res) => {
+  let dif = req.query.x - req.query.y;
+  res.json({operation: `${req.query.x} - ${req.query.y}`, dif: dif});
+});
+app.get("/mul", (req, res) => {
+  let prod = req.query.x * req.query.y;
+  res.json({operation: `${req.query.x} * ${req.query.y}`, prod: prod});
+});
+app.get("/div", (req, res) => {
+  let quo = req.query.x / req.query.y;
+  res.json({operation: `${req.query.x} / ${req.query.y}`, quo: quo});
+});
+app.get("/pow", (req, res) => {
+  let pow = req.query.x ** req.query.y;
+  res.json({operation: `${req.query.x} ^ ${req.query.y}`, pow: pow});
+});
+app.get("/root", (req, res) => {
+  let root = req.query.x ** (1/req.query.y);
+  res.json({operation: `${req.query.x} ^ 1/${req.query.y}`, root: root});
+});
+app.get("/mod", (req, res) => {
+  let mod = req.query.x % req.query.y;
+  res.json({operation: `${req.query.x} % ${req.query.y}`, mod: mod});
 });
 
 app.listen(port, () => {