Node.js Buffer.byteLength() Method

Check the length of a buffer object:

var buf = Buffer.alloc(15);
var len = Buffer.byteLength(buf);
console.log(len);

Definition and Usage

The Buffer.byteLength() method returns the length of a specified string object, in bytes.

Buffer.byteLength(string, encoding);

Parameter	Description
string	Required. Specifies the object to calculate the length of. Supported types are: String Buffer TypedArray DataView ArrayBuffer
encoding	Optional. If the object is a string, this parameter specified its encoding. Default encoding is "utf8"

Return Value:	The number of bytes in the specified object
Node.js Version:	0.1.90

Return the number of bytes in the string "abc":

var len = Buffer.byteLength('abc');
console.log(len);