How to generate a n-digit number using JavaScript? Last Updated : 25 Jun, 2024 Comments Improve Suggest changes Like Article Like Report The task is to generate an n-Digit random number with the help of JavaScript. You can also generate random numbers in the given range using JavaScript. Below are the approaches to generate a n-digit number using JavaScript: Table of Content Using Math.random()Math.random() Method and .substring() MethodUsing Math.random()Get the minimum and maximum number of n digits in variable min and max respectively. Then generate a random number using Math.random()(value lies between 0 and 1). Multiply the number by (max-min+1), get its floor value, and then add a min value to it. Example: The example below shows how to generate a n-digit number using JavaScript. HTML <!DOCTYPE HTML> <html> <head> <title> Generate a n-digit number using JavaScript </title> <style> body { text-align: center; } h1 { color: green; } #geeks { color: green; font-size: 29px; font-weight: bold; } </style> </head> <body> <p> <!-- min and max are 5 digit so--> Click on the button to generate random 5 digit number </p> <button onclick="gfg();"> click here </button> <p id="geeks"> </p> <script> let up = document.getElementById('GFG_UP'); let down = document.getElementById('geeks'); function gfg() { let minm = 10000; let maxm = 99999; down.innerHTML = Math.floor(Math .random() * (maxm - minm + 1)) + minm; } </script> </body> </html> Output: OutputMath.random() Method and .substring() MethodMath.random() method use .substring() method to generate a random number between 0 and 1. Now we will use to get a part of the random number after converting it to string. Example: The example shows How to generate a n-digit number using Math.random() Method and .substring() Method. HTML <!DOCTYPE HTML> <html> <head> <title> Generate a n-digit number using JavaScript </title> <style> body { text-align: center; } h1 { color: green; } #geeks { color: green; font-size: 29px; font-weight: bold; } </style> </head> <body style="text-align:center;"> <p> Click on the button to generate random 6 digit number </p> <button onclick="gfg();"> click here </button> <p id="geeks"> </p> <script> let down = document.getElementById('geeks'); function gfg() { down.innerHTML = ("" + Math.random()).substring(2, 8); } </script> </body> </html> Output: Output Comment More infoAdvertise with us P PranchalKatiyar Follow Improve Article Tags : JavaScript Web Technologies CSS-Misc HTML-Misc HTML-Questions +1 More Similar Reads How numbers are stored in JavaScript ? In this article, we will try to understand how numbers are stored in JavaScript. Like any other programming language, all the data is stored inside the computer in the form of binary numbers 0 and 1. 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