javascript bigint to number - Brave Search

How to convert BigInt to Number in JavaScript?

stackoverflow.com › questions › 53970655 › how-to-convert-bigint-to-number-in-javascript

Turns out it's as easy as passing it to the Number constructor:

const myBigInt = BigInt(10);  // `10n` also works
const myNumber = Number(myBigInt);

Of course, you should bear in mind that your BigInt value must be within [Number.MIN_SAFE_INTEGER, Number.MAX_SAFE_INTEGER] for the conversion to work properly, as stated in the question.

Answer from Lucio Paiva on Stack Overflow

stackoverflow.com › questions › 53970655 › how-to-convert-bigint-to-number-in-javascript

How to convert BigInt to Number in JavaScript? - Stack Overflow

Turns out it's as easy as passing it to the Number constructor:

const myBigInt = BigInt(10);  // `10n` also works
const myNumber = Number(myBigInt);

Of course, you should bear in mind that your BigInt value must be within [Number.MIN_SAFE_INTEGER, Number.MAX_SAFE_INTEGER] for the conversion to work properly, as stated in the question.

You can use parseInt or Number

const large =  BigInt(309);
const b = parseInt(large);
console.log(b);
const n = Number(large);
console.log(n);

w3schools.com › js › js_bigint.asp

JavaScript BigInt

BigInt is the second numeric data type in JavaScript (after Number). With BigInt the total number of supported data types in JavaScript is 8:

Videos

JavaScript Types | Number | BigInt - YouTube

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JavaScript bigint // The missing guide - YouTube

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BigInt - The Needed JavaScript DataType - YouTube

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developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › BigInt

BigInt - JavaScript | MDN

BigInt values are similar to Number values in some ways, but also differ in a few key matters: A BigInt value cannot be used with methods in the built-in Math object and cannot be mixed with a Number value in operations; they must be coerced to the same type.

developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Errors › Cant_convert_BigInt_to_number

TypeError: can't convert BigInt to number - JavaScript | MDN

If an operation involves a mix of BigInts and numbers, it's ambiguous whether the result should be a BigInt or number, since there may be loss of precision in both cases. The error also happens when a BigInt is implicitly converted to a number via the number coercion process.

web.dev › learn › javascript › data-types › bigint

BigInt | web.dev

BigInt values don't inherit the methods and properties by the Number object provides, and they can't be used with the methods JavaScript's built-in Math object provides. Most importantly, you can't mix BigInt and Number primitives in standard arithmetic operations: 9999999999999999n + 5 > Uncaught TypeError: can't convert BigInt to number

JavaScript.info

javascript.info › tutorial › the javascript language › miscellaneous

The unary plus operator +value is a well-known way to convert value to a number. In order to avoid confusion, it’s not supported on bigints:

masteringjs.io › tutorials › fundamentals › bigint-to-number

Convert a BigInt to a Number in JavaScript - Mastering JS

Keep in mind that, if the BigInt is larger than Number.MAX_VALUE or smaller than Number.MIN_VALUE, Number(bigint) will be positive or negative infinity. const tooBig = Number(10n**10000n); tooBig === Number.POSITIVE_INFINITY; // true tooBig; // Infinity const tooSmall = Number((-10n)**10001n); tooSmall === Number.NEGATIVE_INFINITY; // true tooSmall; // -Infinity

reddit.com › r/learnjavascript › how to convert bigint to number as native as possible and as accurate as possible without using string-based solution?

r/learnjavascript on Reddit: How to convert BigInt to Number as native as possible and as accurate as possible WITHOUT using string-based solution?

September 3, 2024 -

The working problem like this...

If I have a big number: 12,345,678,901,234,567,890

Which is expressed as BigInt: 12345678901234567890n

I want to convert it so that the result should be: 1.2345678901234568e19 (i.e. typeof x === "Number"). Note: the last digit is rounded up from 7 to 8, since the next digit in the source big number is 8 - which is 5 or above.

Using a solution which is as native as possible, and as accurate as possible.

One suggested solution in this SO answer was to simply use Number(x). But the result is 12345678901234567000 or 1.2345678901234567e19. i.e. it's truncated rather than rounded, due to integer limitation in 64-bit floating-point data type.

Other SO suggestion was using string based solution which is NOT what I need.

One solution which I know is to split the BigInt into 2 parts (upper & lower digits) first, then combine them back as Number using pure math and scaling. But it's kind of a round about solution, and I consider it only as a last resort.

So, is there a better way to do it?

There isn't a better way to do it, because there isn't a 64-bit floating point number closer to your integer. 12345678901234567890 is not representable in f64, neither is 12345678901234568000. The two closest representable numbers have exact integer values of: 12345678901234567168 and 12345678901234569216 Because the former is closer, that is what gets stored when you convert from your bigint to number. It displays as 1.2345678901234567e+19 because 12345678901234567168 is the closest representable number for everything between 12345678901234566144 and 12345678901234568191 (inclusive). If you can't even be sure the 16th decimal place is correct, displaying more digits is meaningless. More generally, a 64-bit floating point can only give you slightly less than 16 decimal places of precision.

Here you go: Number (integer or decimal) to array, array to number (integer or decimal) without using strings .

Find elsewhere

Google Bing Mojeek

geeksforgeeks.org › javascript › difference-between-bigint-and-number-in-javascript

Difference Between BigInt and Number in JavaScript - GeeksforGeeks

July 23, 2025 - Both serve distinct purposes and have unique characteristics making them suitable for the different scenarios. This article explores the differences between the BigInt and Number in JavaScript their characteristics, applications and provides examples to the illustrate their usage.

blog.logrocket.com › home › how to use javascript’s bigint

How to use JavaScript's BigInt - LogRocket Blog

June 4, 2024 - Generally, all the arithmetic operations except (/) will give a correct mathematical answer when used between two or more bigint values. For instance, the division operator doesn’t give an accurate result at all times. This means that operations such as 5n/2n will round off to 2n instead of 2.5n. The JavaScript number type is written as double-precision 64-bit binary format IEEE 754 value, meaning that 52 bits are used for significant values while one bit and 11 bits are used for the sign and exponents.

designcise.com › web › tutorial › how-to-convert-a-javascript-bigint-value-to-a-number

How to Convert a JavaScript BigInt Value to a Number? - Designcise

September 13, 2021 - You can convert a bigint to a number by simply using the Number wrapper object like so: // ES10+ const MAX_SAFE_INTEGER = 9007199254740991n; console.log(Number(MAX_SAFE_INTEGER)); // 9007199254740991 Please be aware that the precision of a BigInt ...

mathjs.org › docs › datatypes › bigints.html

math.js | an extensive math library for JavaScript and Node.js

When using a bigint in a function that does not support it, like sqrt, it will convert the bigint into a regular number and then execute the function: ... // convert a number to bigint or BigNumber math.bigint(42) // bigint, 42n math.bignumber(42) // BigNumber, 42 // convert a bigint to a number or BigNumber math.number(42n) // number, 42 math.bignumber(42n) // BigNumber, 42 // losing digits when converting to number math.number(70000000000000000123n) // number, 7000000000000000000

JavaScript Tutorial

javascripttutorial.net › home › javascript tutorial › javascript bigint

JavaScript BigInt

November 14, 2024 - To make a BigInt, you append n to the end of the number literal, for example: let bigInt = 9007199254740991n;Code language: JavaScript (javascript)

geeksforgeeks.org › javascript › javascript-bigint

JavaScript BigInt - GeeksforGeeks

December 4, 2025 - A BigInt is similar to a Number in some ways, however, it cannot be used with methods of the builtin Math object and cannot be mixed with instances of Number in operations.

medium.com › @vdsnini › how-i-discovered-the-power-of-bigint-in-javascript-a16d6cc5671f

How I Discovered the Power of BigInt in JavaScript | by Beenish Khan | Medium

February 17, 2025 - JSON.stringify({ value: BigInt(123).toString() }); Final Thoughts Before this, I never really thought about JavaScript’s number limitations. But running into this bug forced me to dig deeper, and I’m glad I did.

v8.dev › features › bigint

BigInt: arbitrary-precision integers in JavaScript · V8

Large integer IDs and high-accuracy timestamps cannot safely be represented as Numbers in JavaScript. This often leads to real-world bugs, and causes JavaScript developers to represent them as strings instead. With BigInt, this data can now be represented as numeric values.

w3docs.com › learn-javascript › bigint.html

Mastering JavaScript: A Comprehensive Guide to BigInt and Beyond

This guide will focus on BigInt's functionality, showcase practical code examples, and extend into more advanced JavaScript topics. BigInt is a numeric type that enables representation of integers beyond the Number type's limit of 2^53 - 1, ...

scaler.com › home › topics › javascript bigint library

JavaScript BigInt Library - Scaler Topics

September 29, 2023 - It is a primitive data type in javascript that can be created by adding n at the end position of the integer. We can also do this by using the BigInt() function and passing the integer value as the parameter of this function using the new operator.

npmjs.com › package › big-integer

big-integer - npm

Base 0 is only allowed for the number zero. ... Converts a bigInt to a native Javascript number.

      » npm install big-integer

Published Nov 21, 2023

Version 1.6.52

Author Peter Olson

Repository https://github.com/peterolson/BigInteger.js

Homepage https://github.com/peterolson/BigInteger.js#readme

stackoverflow.com › questions › 61583163 › javascript-data-type-bigint-vs-number

Javascript data type: BigInt vs Number - Stack Overflow

MDN doc

BigInt is a built-in object that provides a way to represent whole numbers larger than 2^53 - 1, which is the largest number JavaScript can reliably represent with the Number primitive and represented by the Number.MAX_SAFE_INTEGER constant. BigInt can be used for arbitrarily large integers.

Difference:

BigInt cannot be used with methods in the built-in Math object and cannot be mixed with instances of Number in operations
Because coercing between Number and BigInt can lead to loss of precision, it is recommended to only use BigInt when values greater than 2^53 are reasonably expected and not to coerce between the two types.

The differences between BigInt and Number:

	`Number`	`BigInt`
Safe Range	`Number.MAX_SAFE_INTEGER`; loses precision outside of this range	Extremely large integers
Math operations	Supports the `Math` object	Basic arithmetic operations: `+ * - % **`
Decimal vs. Integer support	Integers and decimals, e.g `1.00, 2.56`	Only integers, e.g `1n, 2n`. `5n / 2 === 2n`
Syntax	No special syntax	Append `n` to the end of a number literal or use `new BigInt('100')`
Type Conversion	Automatically converts `Number` to `BigInt` in operations	Requires explicit conversion to `Number` for arithmetic involving `Number` values
JSON	Supported by default	Not serializable by default

Use BigInt when you need to work with extremely large integers or require precise integer arithmetic without any loss of precision.