BigInt.prototype.valueOf()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2020.

The valueOf() method of BigInt values returns the wrapped primitive value of a BigInt object.

Try it

console.log(typeof Object(1n));
// Expected output: "object"

console.log(typeof Object(1n).valueOf());
// Expected output: "bigint"

Syntax

js
valueOf()

Parameters

None.

Return value

A BigInt representing the primitive value of the specified BigInt object.

Examples

Using valueOf

js
typeof Object(1n); // object
typeof Object(1n).valueOf(); // bigint

Specifications

Specification
ECMAScript® 2025 Language Specification
# sec-bigint.prototype.valueof

Browser compatibility

BCD tables only load in the browser

See also