Node.js Buffer.from() Method (original) (raw)
Last Updated : 11 Apr, 2023
The Buffer.from() method is used to create a new buffer containing the specified string, array, or buffer.
Syntax:
Buffer.from( object, encoding )
Parameters: This method accepts two parameters as mentioned above and described below:
- object: This parameter can hold either a string, buffer, array, or array buffer.
- encoding: If the object is a string then it is used to specify its encoding. It is an optional parameter. Its default value is utf8.
Example 1: In this example, we will see the use of the Buffer.from() method
javascript `
// Node.js program to demonstrate the // Buffer.from() Method
// Returns a new buffer with // copy of the given string const buf1 = Buffer.from("hello");
// Display the buffer object // of the given string console.log(buf1);
// Convert the buffer to the // string and displays it console.log(buf1.toString());
`
Output:
<Buffer 68 65 6c 6c 6f> hello
Example 2: In this example, we will see the use of the Buffer.from() method
javascript `
// Node.js program to demonstrate the // Buffer.from() Method
// Creates an arrayBuffer with // length 10 const arbuff = new ArrayBuffer(8);
// Returns a new buffer with a // specified memory range within // the arrayBuffer const buf = Buffer.from(arbuff, 0, 2);
// Displays the length console.log(buf.length);
`
Output:
2
Example 3: In this example, we will see the use of the Buffer.from() method
javascript `
// Node.js program to demonstrate the // Buffer.from() Method
// Create a new buffer with // copy of the given string const buf1 = Buffer.from("John");
// Create another buffer with // copy of given buffer const buf2 = Buffer.from(buf1);
// Display the buffer object console.log(buf2);
// Convert the buffer to // string and displays it console.log(buf2.toString());
`
Output:
<Buffer 4a 6f 68 6e> John
Note: The above program will compile and run by using the node index.js command.
Reference: https://nodejs.org/api/buffer.html#buffer_class_method_buffer_from_string_encoding