To check whether some data or an object is a Buffer, you can use the isBuffer() method in the global Buffer class in Node.js.

// a buffer
const buff = Buffer.alloc(10);

// check whether buff object is
// an instance of Buffer class
const isItBuffer = Buffer.isBuffer(buff);

console.log(isItBuffer); // true

• The method returns boolean true if it is an instance of Buffer class and false if not.

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