JavaScript (ES2026) reference · Number Methods and Properties

JavaScript Number.MAX_SAFE_INTEGER Property

The largest integer JavaScript numbers can represent exactly: 2^53 - 1, or 9,007,199,254,740,991.

JavaScript (ES2026) Since ES2015

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Syntax

Number.MAX_SAFE_INTEGER

9007199254740991

Precision ends hereTry it yourself

console.log(Number.MAX_SAFE_INTEGER, Number.MAX_SAFE_INTEGER + 2);

Output

9007199254740991 9007199254740992

Large IDs: keep them as strings or BigIntTry it yourself

const id = "9007199254740993";
console.log(Number(id), BigInt(id));

Output

9007199254740992 9007199254740993n

Version	Change
JavaScript ES2015	Added

Number.isSafeInteger() · Return true if a value is an integer that can be represented exactly, between -(2^53 - 1) and 2^53 - 1.
Number.EPSILON · The smallest difference between 1 and the next representable number, used as a tolerance when comparing floats.
JavaScript Numbers · tutorial
JavaScript Type Conversion · tutorial