Node.js Buffer.writeUInt16BE() Method

The Buffer.writeUInt16BE() method is used to write specified bytes using Big endian format to the buffer object. The value should be a valid unsigned 16-bit integer.

Syntax:

Buffer.writeUInt16BE( value, offset )

Parameters: This method accept two parameters as mentioned above and described below:

• value: It is an integer value and that is to be written into the buffer.
• offset: It is an integer value and it represents the number of bytes to skip before starting to write and the value of offset lies within the range 0 to buffer.length – 2. Its default value is 0.

Return value: It returns an integer value offset plus number of bytes written.

Example 1:

// Node.js program to demonstrate the
// Buffer.writeUInt16BE() Method

// Allocate a buffer
const buf = Buffer.allocUnsafe(4);

// Write the buffer element in BE format
buf.writeUInt16BE(0xabcd, 0);

// Display the buffer list
console.log(buf);

// Write the buffer element in BE format
buf.writeUInt16BE(0xfede, 2)

// Display the buffer list
console.log(buf);

Output:

<Buffer ab cd f4 09>
<Buffer ab cd fe de>

Example 2:

// Node.js program to demonstrate the
// Buffer.writeUInt16BE() Method

// Allocate a buffer
const buf = Buffer.allocUnsafe(4);

// Write the buffer element in BE format
buf.writeUInt16BE(0xabab, 0);

// Display the buffer list
console.log(buf);

// Write the buffer element in BE format
buf.writeUInt16BE(0xefde, 2);

// Display the buffer list
console.log(buf);

Output:

<Buffer ab ab ad 09>
<Buffer ab ab ef de>

Note: The above program will compile and run by using the node index.js command.

Reference: https://nodejs.org/api/buffer.html#buffer_buf_writeuint16be_value_offset