Node.js Buffer.writeUInt16LE() Method

The Buffer.writeUInt16LE() method is used to write specified bytes in Little Endian format to the buffer object. Here, value should be a valid unsigned 16-bit integer.

Syntax:

Buffer.writeUInt16LE( 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 to 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 and its default value is 0.

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

Example 1:

// Node.js program to demonstrate the
//Buffer.writeUInt16LE() Method
const buff = Buffer.allocUnsafe(4);

buff.writeUInt16LE(0xdead, 0);
console.log(buff);

buff.writeUInt16LE(0xbeef, 2)
console.log(buff);

Output:

<Buffer ad de 00 00>
<Buffer ad de ef be>

Example 2:

// Node.js program to demonstrate the
//Buffer.writeUInt16LE() Method
const buff = Buffer.allocUnsafe(4);

buff.writeUInt16LE(0xfeed, 0);
console.log(buff);

buff.writeUInt16LE(0xabcd, 2);
console.log(buff);

Output:

<Buffer ed fe 00 00>
<Buffer ed fe cd ab>
 

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

Reference: https://nodejs.org/api/buffer.html#buffer_buf_writeuint16le_value_offset