read-chunk 
Read a chunk from a file
Because the built-in way is too much boilerplate.
Install
$ npm install --save read-chunk
Usage
const readChunk = require('read-chunk');
// foo.txt => hello
readChunk.sync('foo.txt', 1, 3);
//=> 'ell'API
readChunk(filepath, position, length)
Returns a promise for a buffer.
readChunk.sync(filepath, position, length)
Returns a buffer.
filepath
Type: string
position
Type: number
Position to start reading.
length
Type: number
Number of bytes to read.
License
MIT © Sindre Sorhus