Node.js buffers are objects that store arbitrary binary data. Buffers have a length property that contains the number of bytes in the buffer.

const buf = Buffer.from('Hello, World', 'utf8');

buf.length; // 12, same as 'Hello, World'.length

For buffers containing UTF8 encoded strings, the buffer’s length is equivalent to the length of the string. For example, if you read a text file from the file system using fs, the resulting buffer’s length is the same as the number of characters in the text file.

const fs = require('fs');
fs.writeFileSync('./test.txt', 'Hello, World');

const buf = fs.readFileSync('./test.txt');

Buffer.isBuffer(buf); // true
buf.length; // 12, same as 'Hello, World'.length

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