Node.js Buffer.readUInt32BE() Method
Last Updated :
13 Oct, 2021
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The Buffer.readUInt32BE() method is an inbuilt application programming interface of class Buffer within the Buffer module which is used to read 32-bit value from an allocated buffer at a specified offset.
Syntax:
javascript
Output:
javascript
Output:
javascript
Output:
Buffer.readUInt32BE( offset )Parameters: This method accept single parameter offset which specifies the number of bytes to skip before read or simply signify the index in the buffer. The value of offset lies 0 <= offset <= Buffer.length - 4. Its default value is 0. Return Value: This method returns an integer value that read from buffer in Big Endian format. Below examples illustrate the use of Buffer.readUInt32BE() method in Node.js: Example 1:
// Node program to demonstrate the
// Buffer.readUInt32LE() Method
// Allocating buffer from array
const buf = Buffer.from([0x21, 0x09, 0x19, 0x98,
0x16, 0x09, 0x19, 0x96]);
// Printing allocated buffer
console.log(buf);
// Reading 32 bits data from the buffer
// and printing it as a string
console.log(buf.readUInt32BE(0).toString(16));
console.log(buf.readUInt32BE(1).toString(16));
console.log(buf.readUInt32BE(2).toString(16));
console.log(buf.readUInt32BE(3).toString(16));
console.log(buf.readUInt32BE(4).toString(16));
<Buffer 21 09 19 98 16 09 19 96> 21091998 9199816 19981609 98160919 16091996Example 2:
// Node program to demonstrate the
// Buffer.readUInt32LE() Method
// Allocating buffer from array
const buf = Buffer.from([0x21, 0x09, 0x19, 0x98,
0x34, 0xae, 0xe8, 0xff]);
// Printing allocated buffer
console.log(buf);
// Reading 16bits data from the
// buffer and printing it as a string
console.log(buf.readUInt32BE(0).toString(16));
console.log(buf.readUInt32LE(0).toString(16));
console.log(buf.readUInt32BE(1).toString(16));
console.log(buf.readUInt32LE(1).toString(16));
console.log(buf.readUInt32BE(2).toString(16));
console.log(buf.readUInt32LE(2).toString(16));
console.log(buf.readUInt32BE(3).toString(16));
console.log(buf.readUInt32LE(3).toString(16));
console.log(buf.readUInt32BE(4).toString(16));
console.log(buf.readUInt32LE(4).toString(16));
<Buffer 21 09 19 98 34 ae e8 ff> 21091998 98190921 9199834 34981909 199834ae ae349819 9834aee8 e8ae3498 34aee8ff ffe8ae34Example 3:
// Node program to demonstrate the
// Buffer.readUInt32LE() Method
// Allocating buffer from array
const buf = Buffer.from([0x21, 0x09, 0x19, 0x98]);
// Printing allocated buffer
console.log(buf);
// Reading 16bits data from the buffer
// and printing it as a string
console.log(buf.readUInt32BE(0).toString(16));
// Wrong index is provoded to produce error
console.log(buf.readUInt32BE(1).toString(16));
<Buffer 21 09 19 98>
21091998
internal/buffer.js:49
throw new ERR_OUT_OF_RANGE(type || 'offset',
^
RangeError [ERR_OUT_OF_RANGE]: The value of "offset" is out of range.
It must be >= 0 and <= 0. Received 1
at boundsError (internal/buffer.js:49:9)
at Buffer.readUInt32BE (internal/buffer.js:192:5)
. . .
Note: The above program will compile and run by using the node index.js command.
Reference: https://nodejs.org/api/buffer.html#buffer_buf_readuint32be_offset
