String to int rounding number on nodeJS app

Question

I have a string as numbers. And I want to transform string to int.

So my code like that:

const bigNumber = '6972173290701864962'
console.log(bigNumber)
//6972173290701864962         =====> last digits : *****1864962 

console.log(Number(bigNumber))
//6972173290701865000         =====> last digits : *****1865000

Why Im getting rounding number? How can I solve this problem?

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt — epascarello, Jul 23 '21 at 15:21
Your value is larger than what can be accurately represented in JavaScript numbers. — Pointy, Jul 23 '21 at 15:22

Spectric · Answer 1 · 2021-07-23T16:32:42.467

2

The number is greater than Number.MAX_SAFE_INTEGER.

Instead, cast a to a BigInt:

const bigNumber = '6972173290701864962'
console.log('Number: '+Number(bigNumber))
console.log('BigInt: '+BigInt(bigNumber))

To remove the trailing n, simply call toString():

const bigNumber = '6972173290701864962'
console.log(BigInt(bigNumber).toString());

edited Jul 23 '21 at 16:32

answered Jul 23 '21 at 15:23

Spectric

27,594
6
14
39

Thanks @Spectric. I made with BigInt(bigNumber). But Its added 'n' to last digit of the number. Why and What is the correct way for escape this 'n' case. – akasaa Jul 23 '21 at 16:30
@akasaa Call `toString()` – Spectric Jul 23 '21 at 16:31

String to int rounding number on nodeJS app

1 Answers1