JavaScript · Numbers and Math

Number.isSafeInteger()

True when an integer can be represented exactly without precision loss.

javascriptRunnable example javascript course

Syntax

Number.isSafeInteger(value)

Example

Try it

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

Reference pages are the quick answer. The course explains the why, shows the full example and ends with a challenge.