Node.js Buffer.writeUInt32LE() Method

Last Updated : 13 Oct, 2021

The Buffer.writeUInt32LE() method is used to write specified bytes using Little endian format to the buffer object. The value contains a valid unassigned 32-bit integer. Syntax:

Buffer.writeUInt32LE( 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 - 4. Its default value is 0.

Return value: It returns an integer value offset plus number of bytes written. Example 1:

javascript

// Node.js program to demonstrate the  
// Buffer.writeUInt32LE() Method

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

// Write the buffer element in LE format
buf.writeUInt32LE(0xabcdabcd, 0);

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

// Write the buffer element in LE format
buf.writeUInt32LE(0xfacedcba, 0);

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

Output:

<Buffer cd ab cd ab>
<Buffer ba dc ce fa>

Example 2:

javascript

// Node.js program to demonstrate the  
// Buffer.writeUInt32LE() Method

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

// Write the buffer element in LE format
buf.writeUInt32LE(0xabce, 0);

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

// Write the buffer element in LE format
buf.writeUInt32LE(0xeab, 0);

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

Output:

<Buffer ce ab 00 00>
<Buffer ab 0e 00 00>

Note: The above program will compile and run by using the node index.js command. Reference: https://nodejs.org/api/buffer.html#buffer_buf_writeuint32le_value_offset

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