JavaScript - random byte value

In this short article, we would like to show to randomize byte value using JavaScript.

Note: as byte value we understand signed 8 bits integer value (from -128 to 127).

Quick solution:

const value = Math.floor(256 * Math.random()) - 128;

Reusable function

// ONLINE-RUNNER:browser;

const randomByte = () => Math.floor(256 * Math.random() - 128);


// Usage example:

console.log(randomByte());  // 106
console.log(randomByte());  // 7
console.log(randomByte());  // -82

See also

1. JavaScript - random boolean value

2. JavaScript - random short value

3. JavaScript - random int value

4. JavaScript - random long value