`Number.isSafeInteger()`

Determines whether a value is an integer that can be exactly represented as a double.

Since ES2015 Spec ↗

Syntax

Number.isSafeInteger(value)

Name	Type	Required	Description
`value`	`any`	Yes	The value to test.

boolean — true if the value is a safe integer; otherwise false.

console.log(Number.isSafeInteger(2 ** 53 - 1));

Output

true

console.log(Number.isSafeInteger(2 ** 53));

Output

false

A safe integer is one between -(2^53 - 1) and 2^53 - 1 inclusive, where no other integer rounds to it. Use BigInt for integers beyond this range.