We need a way to do 128 bit math in a Node.js program. It looks like I can link a C++ library to do this, but since this will be open source for many platforms I would first like to try something that would not introduce special platform builds.

I see that JavaScript only supports only up to 64-bits. However, I have also seen JavaScript emulate a CPU and run Linux, so I'm certain this is possible. I'm not certain yet, but we probably need only a few basic math functions.

Do you know of something that exists already (I have not found one)? What approach would you take?

We need a way to do 128 bit math in a Node.js program. It looks like I can link a C++ library to do this, but since this will be open source for many platforms I would first like to try something that would not introduce special platform builds.

I see that JavaScript only supports only up to 64-bits. However, I have also seen JavaScript emulate a CPU and run Linux, so I'm certain this is possible. I'm not certain yet, but we probably need only a few basic math functions.

Do you know of something that exists already (I have not found one)? What approach would you take?

• javascript
• node.js

3 Answers 3

News from the year 2020:

Node.js (version 10.4.0+) supports BigInts, which are arbitrarily large integers.

• They can be created by appending an n to a number, or by calling BigInt(), for example
  • 123n
  • BigInt(123)
• Operators +, *, -, /, **, % work as with numbers
• Operator / truncates the result to an integer
• Operators <<, >>, <<< work as with numbers
• Operator >>> does not work
• 123n == 123, but 123n !== 123 (they are different types)

For more information see: MDN web docs BigInt

This may work for you:

npm install big.js

It claims to be a small, fast JavaScript library for arbitrary-precision decimal arithmetic.

Try this.

Try

npm install int

and see if that works for you -- it is supposedly handling arbitrary precision integer

documentation here; https://www.npmjs/package/int

There is list of similar packages if that specific package does not work for you; https://www.npmjs/browse/keyword/bignum