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BigInt.prototype.valueOf() - JavaScript | MDN
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Using
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® 2026 Language Specification # sec-bigint.prototype.valueof |
Browser compatibility
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