Test if a value is a BigInt.
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> Test if a value is a [BigInt][mdn-bigint].
``bash`
npm install @stdlib/assert-is-bigint
`javascript`
var isBigInt = require( '@stdlib/assert-is-bigint' );
#### isBigInt( value )
Tests if a value is a [BigInt][mdn-bigint].
`javascript
var Object = require( '@stdlib/object-ctor' );
var BigInt = require( '@stdlib/bigint-ctor' );
var bool = isBigInt( BigInt( '1' ) );
// returns true
bool = isBigInt( Object( BigInt( '1' ) ) );
// returns true
`
#### isBigInt.isPrimitive( value )
Tests if a value is a primitive [BigInt][mdn-bigint].
`javascript
var Object = require( '@stdlib/object-ctor' );
var BigInt = require( '@stdlib/bigint-ctor' );
var bool = isBigInt.isPrimitive( BigInt( '1' ) );
// returns true
bool = isBigInt.isPrimitive( Object( BigInt( '1' ) ) );
// returns false
`
#### isBigInt.isObject( value )
Tests if a value is a [BigInt][mdn-bigint] object.
`javascript
var Object = require( '@stdlib/object-ctor' );
var BigInt = require( '@stdlib/bigint-ctor' );
var bool = isBigInt.isObject( BigInt( '1' ) );
// returns false
bool = isBigInt.isObject( Object( BigInt( '1' ) ) );
// returns true
`
`javascript
var hasBigIntSupport = require( '@stdlib/assert-has-bigint-support' );
var BigInt = require( '@stdlib/bigint-ctor' );
var isBigInt = require( '@stdlib/assert-is-bigint' );
var bool;
if ( hasBigIntSupport() ) {
bool = isBigInt( BigInt( '1' ) );
// returns true
} else {
console.log( 'Environment does not support BigInts.' );
}
bool = isBigInt( 1 );
// returns false
bool = isBigInt( '1' );
// returns false
bool = isBigInt( {} );
// returns false
bool = isBigInt( [] );
// returns false
bool = isBigInt( null );
// returns false
bool = isBigInt( void 0 );
// returns false
bool = isBigInt( true );
// returns false
bool = isBigInt( function foo() {} );
// returns false
`
*
This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
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---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/assert-is-bigint/tree/deno
[deno-readme]: https://github.com/stdlib-js/assert-is-bigint/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/assert-is-bigint/tree/umd
[umd-readme]: https://github.com/stdlib-js/assert-is-bigint/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/assert-is-bigint/tree/esm
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[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/assert-is-bigint/main/LICENSE
[mdn-bigint]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt