total request calculation

app.js

@@ -0,0 +1,57 @@
+import express from "express";
+import zod from "zod";
+const app = express();
+
+const schema = zod.array(zod.number());// array of number validation check
+// another example of zod:
+const schema2 = zod.object({
+    email: zod.string().email(),
+    password: zod.string().min(8)
+})
+
+let TotalRequest = 0;
+
+app.use(express.json());
+
+function calculateRequest(req, res, next) {
+    console.log(TotalRequest);
+    TotalRequest++;
+    next();
+}
+// middleware for all requests:----------------------------------------->
+// app.use(calculateRequest);
+
+// request specific middleware:
+app.get('/ok', calculateRequest, (req, res) => {
+    res.status(200).json({
+        TotalRequest: TotalRequest
+    });
+});
+
+app.post('/arr', calculateRequest, (req, res) => {
+    const array = req.body.ans;
+    // const ansCheck = schema.Parse(array);
+    const ansCheck = schema.safeParse(array);
+    const len = ansCheck.data.length;
+    if (!ansCheck.success) {
+        res.status(400).send("input is invalid");
+    }
+    res.status(200).send("you have array length " + len);
+});
+
+// passing params to middleware:
+const greet = (greet) => {
+    return (req, res) => {
+        res.send(greet + " to you");
+    }
+}
+app.get('/greet', greet("Hi"));
+
+// global catches:------------------------------------------->
+app.use((err, req, res, next) => {
+    res.status(400).json({
+        msg: "Sorry something is wrong with our server."
+    });
+});
+
+app.listen('5000');