Node.js provides the `buffer` module to handle a fixed-length sequence of bytes. The `buffer` class is globally provided, so it can be used without having to use `require('Buffer')`. The `buffer` class provides many methods to allocate and manipulate `buffers`, including reading and writing to `buffer` objects.

The `buffer.writeInt32BE()` method writes a `value` to the specified `offset` in the buffer in the big-endian format. The `value` must be a 32-bit signed integer, otherwise the behavior of `buffer.writeInt32Be()` is undefined.

**Endianness** represents the order of bytes in a computer system. There are two types of endianness: *little-endian* and *big-endian*. 
* **Big-endian**: Big-endian stores the most significant bytes (MSB) first.

* **Little-endian**: Little-endian stores the least significant bytes (LSB) first.




# Prototype
```javascript
buf.writeInt32BE(value[, offset])
```

# Parameters
* **`value`** `<integer>`: `value` is a valid 32-bit signed integer.
* **`offset`** `<integer>`: `offset` determines the number of bytes after which the `value` must be written. `offset` must be between 0 and `buffer.length - 4`. The default `offset` is $0$.

# Return value
`buffer.writeInt32BE()` returns the `offset` plus the number of bytes written to the buffer.
# Code

const buff = Buffer.alloc(8);

buff.writeInt32BE(0x01020304, 4);

console.log(buff)

In the code snippet above, first, we allocate a buffer of size 8 bytes using the `Buffer.alloc` method. This creates a `buffer` object of size 8-bytes and fills it with a default value of `0x00`. 

We then write the value `0x01020304` to the `buffer` object using `buff.writeInt32BE(0x01020304, 4)`, which writes the `value` to the buffer at an `offset` of 4-bytes.

Printing the `buffer` object shows us that the first 4 bytes are `0x00` and our value has been successfully written to the later 4 bytes. 

What is buffer module writeInt32BE() in Node.js?

Node.js provides the buffer module to handle a fixed-length sequence of bytes. The buffer class is globally provided, so it can be used without having to use require( Buffer ). The buffer class provides many methods to allocate and manipulate buffers, including reading and writing to buffer objects. The buffer.writeInt32BE() method writes a value to the specified offset in the buffer in the big-endian format. The value must be a 32-bit signed integer, otherwise the behavior of buffer.writeInt32Be() is undefined. Endianness represents the order of bytes in a computer system. There are two types of endianness: little-endian and big-endian.   Big-endian: Big-endian stores the most significant bytes (MSB) first.   Little-endian: Little-endian stores the least significant bytes (LSB) first.   