Node.js – Convert Array to Buffer

Node.js – Convert Array to Buffer : To convert array (octet array/ number array/ binary array) to buffer, use Buffer.from(array) method.

In this tutorial, we will learn how to convert array to buffer using Buffer.from() method, with some examples.

Syntax – Buffer.from()

The syntax of from() method is

Buffer.from(array)

Buffer.from method reads octets from array and returns a buffer initialized with those read bytes.

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Example 1 – Read an octet array to buffer

In the following example, an octet array is read to a buffer.

array-to-buffer.js

var arr = [0x74, 0x32, 0x91];
const buf = Buffer.from(arr);

for(const byt of buf.values()){
	console.log(byt);
}

Output

$ node array-to-buffer.js 
116
50
145

We have logged data in each byte as a number.

0x74 = 0111 0100 = 116
0x32 = 0011 0010 = 50
0x91 = 1001 0001 = 145

Example 2 – Read a number array to buffer

In the following example, a number array is read to a buffer.

array-to-buffer.js

var arr = [74, 32, 91];
const buf = Buffer.from(arr);

for(const byt of buf.values()){
	console.log(byt);
}

Output

$ node array-to-buffer.js 
74
32
91

We have logged data in each byte as a number.

Example 3 – Read boolean array to buffer

In the following example, an octet array is read to a buffer.

array-to-buffer.js

var arr = [true, true, false];
const buf = Buffer.from(arr);

for(const byt of buf.values()){
	console.log(byt);
}

Output

$ node array-to-buffer.js 
1
1
0

true is 1, while false is 0.

Conclusion

In this Node.js Tutorial – Node.js Convert Array to Buffer, we have learnt how to convert octet array, number array and boolean array to Node.js buffers.