How to Determine the Byte Size of a JavaScript String

Determining the Byte Size of a JavaScript String

In JavaScript, strings are represented using the Unicode character encoding standard, known as UCS-2. This means that each character in a string is typically represented by two bytes. However, the actual byte size of a string can vary depending on factors such as the string encoding used during transmission (e.g., UTF-8) and the specific browser implementation.

Calculating String Size in Bytes Using the Blob Object

To determine the size of a string in bytes, we can use the Blob object, which provides a method to measure the size of binary data. Here's how it works:

<code class="js">const string = 'Your JavaScript String Here';
const blob = new Blob([string]); // Create a Blob from the string
const sizeInBytes = blob.size; // Get the byte size of the Blob</code>

The size property of the Blob object returns the byte size of the data contained within it. In this case, it will provide the byte size of the JavaScript string.

Example:

Consider a string of about 500KB when sent from the server in UTF-8:

<code class="js">const string = 'This is a large JavaScript string about 500K in size.';

const blob = new Blob([string]);
const sizeInBytes = blob.size;

console.log('Byte size of the string:', sizeInBytes);</code>

This code will log the byte size of the string in the console.

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