BigInt

BigInt is a numeric primitive that can represent integers with arbitrary precision. It was added in ES2020 to handle numbers larger than 2^53 - 1 (the maximum safe integer for Number).

Create a BigInt by appending n to an integer or using the BigInt() function.

let big = 123456789012345678901234567890n;
let alsoBig = BigInt("9007199254740993");

Operations:

Arithmetic with BigInt works similarly, but you cannot mix BigInt and regular Number in operations.

let sum = 100n + 200n; // 300n
// let mix = 100n + 50; // TypeError

Comparisons (like >, <) work across types.

console.log(100n > 50); // true

Division truncates toward zero.

console.log(5n / 2n); // 2n

BigInt is useful for high‑precision applications (cryptography, large IDs) but not for everyday math due to performance and interoperability concerns.