JavaScript Math.random()

let x = Math.random();

Return a random number between 0 and 10:

let x = Math.random() * 10;

Return a random number between 0 and 100:

let x = Math.random() * 100;

A random whole number between 1 and 10:

let x = Math.floor((Math.random() * 10) + 1);

A random whole number between 1 and 100:

let x = Math.floor((Math.random() * 100) + 1);

Description

The Math.random() method returns a random number from 0 (inclusive) up to but not including 1 (exclusive).

Math.random() does not return a cryptographically secure number.

If you need a cryptographically secure number, use this Crypto API method:
crypto.getRandomValues()

Math.random()

NONE

Type	Description
Number	A random number from 0 (inclusive) up to but not including 1 (exclusive).

Math.random() is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	Yes