Sometimes, we want to convert a 32 bit integer into 4 bytes of data in JavaScript.

In this article, we’ll look at how to convert a 32 bit integer into 4 bytes of data in JavaScript.

How to convert a 32 bit integer into 4 bytes of data in JavaScript?

To convert a 32 bit integer into 4 bytes of data in JavaScript, we can use the ArrayBuffer and DataView constructors.

For instance, we write:

const toBytesInt32 = (num) => {
  const arr = new ArrayBuffer(4);
  const view = new DataView(arr);
  view.setUint32(0, num, false);
  return arr;
}

console.log(toBytesInt32((57586868).toString(2)))

to define the toBytesInt32 function that takes the num string.

In it, we create an ArrayBuffer with 4 to create a 4 bytes array buffer.

Then create a DataView instance with the array buffer.

And then we populate the view with num.

Conclusion

To convert a 32 bit integer into 4 bytes of data in JavaScript, we can use the ArrayBuffer and DataView constructors.