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JavaScript BigInt Reference - GeeksforGeeks

JavaScript BigInt Reference

Last Updated : 23 Jul, 2025

JavaScript BigInt is an inbuilt object in JavaScript that provides a way to represent whole numbers larger than 2⁵³-1 which is the largest number that can represent with the Number primitive. It is represented by the MAX_SAFE_INTEGER constant.

Example: This example creates a BigInt by appending n at the end of the number.

JavaScript


 // Decimal format
let bigNum = 123422222222222222222222222222222222222n
console.log(bigNum)

// Hexadecimal format
let bigHex = 0x1ffffffeeeeeeeeefn
console.log(bigHex)

// Binary format
let bigBin = 0b1010101001010101001111111111111111n
console.log(bigBin)

Output:

123422222222222222222222222222222222222n
VM41:6 36893488074118328047n
VM41:10 11430854655n

The complete methods of the JavaScript BigInt object are listed below:

JavaScript BigInt Constructor: A constructor gets called when an object is created using the new keyword.

Constructor Descriptions BigInt() Convert any primitive data type or object to a BigInt data type.

JavaScript BigInt Properties: A JavaScript property is a member of an object that associates a key with a value.

Instance Property: An instance property is a property that has a new copy for every new instance of the class.

Instance Properties Descriptions constructor Return the bigInt constructor function for the object.

JavaScript BigInt Methods: Methods are actions that can be performed on objects.

Static Method: If the method is called using the BigInt class itself then it is called a static method of BigInt.

Static Methods Descriptions asIntN() Wrap a BigInt value to a signed integer between -2width-1 and 2width-1-1. asUintN() Wrap a BigInt value to an unsigned integer between 0 and 2width-1.

Instance Method: If the method is called on an instance of a number then it is called an instance method.

Instance Methods Descriptions toLocaleString() Return a string with a language-sensitive representation of this BigInt. toString() Return a string representing the specified BigInt object. valueOf() Return the wrapped primitive value of a BigInt object.

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