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

@jfriend00 has already provided a very clear explanation on this issue. If a Buffer object is passed as argument to fs.createReadStream(), it should indicate the file path, not file content. As @Littlee asked in comment, here is an example code:

var express = require('express');
var router = express.Router();
var fs = require('fs')

router.get('/test', function(req, res) {
  var buf = Buffer.from('./test.html');
  fs.createReadStream(buf).pipe(res);
});

Please note the Buffer buf indicates a file path ("./test.html"), not the file test.html's content.