How to pass a Buffer as argument of fs.createReadStream

Question

According to docs https://nodejs.org/api/fs.html#fs_fs_createreadstream_path_options

fs.createReadStream() can accept Buffer as first argument

my node code:

Answer 1

Creating a Readable Stream From Buffer.

You can easily create a Readable Stream from a Buffer, however using fs.createReadStream() does indeed require first writing it to a file path.

Using stream.Duplex()

• No need to write a local file in order to get a readable stream
• Saves I/O and speeds things up.
• Works everywhere fs.createReadStream() is desired.
• Great for writing to cloud services where local storage my not be feasible.

Example:

const {Duplex} = require('stream'); // Native Node Module 

function bufferToStream(myBuuffer) {
    let tmp = new Duplex();
    tmp.push(myBuuffer);
    tmp.push(null);
    return tmp;
}

const myReadableStream = bufferToStream(your_buffer);

// use myReadableStream anywhere you would use a stream 
// created using fs.createReadStream('some_path.ext');
// For really large streams, you may want to pipe the buffer into the Duplex.