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API/returnMultiplicationTables.js

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+const express = require('express')
+const app = express()
+
+const port = 3001
+
+app.use(express.json())
+
+app.get('/', (req, res) => {
+
+    const error = (err) => {
+
+        res.status('400').json({
+
+            'status': 'error',
+            'message': err
+        })
+    }
+
+    const data = req.body
+    
+    if (!data) {
+
+        error(`Data not sended`)
+        return
+    }
+
+    //!Template
+    /*
+        
+        {
+            "numberToMultiply" = 5,
+            "initialNumber" = 0,
+        }
+    */
+
+    const numberToMultiply = data.numberToMultiply
+    let initialNumber = data.initialNumber
+    let limit = data.limit
+   
+    if (!data.hasOwnProperty("numberToMultiply")) {
+        
+        error(`Number to multiply don't defined`)
+        return
+    }
+
+    if (typeof(numberToMultiply) !== 'number') {
+
+        error(`Number to multiply is not a number`)
+        return 
+    }
+
+    if (!data.hasOwnProperty("initialNumber") || typeof(initialNumber) !== 'number' || initialNumber < 0) {
+
+        initialNumber = 0
+    }
+
+    if (!data.hasOwnProperty("limit") || typeof(limit) !== 'number' || limit < 0 || limit > 999) {
+
+        limit = 10
+    }
+
+    let result = []
+    let i = initialNumber
+
+    while (i <= (initialNumber + limit)) {
+        
+        result.push(`${numberToMultiply} x ${i} = ${numberToMultiply * i}`)
+        i++
+    }
+
+    res.json({
+
+        'status': 'success',
+        'message': result
+    })
+})
+
+app.listen(port)