NodeJS MongoDB-GridFS Video range stream exampleLets your browser seek/jump wihin the video-playback.

GridStream.js

var express = require('express');
var app = express();

var mongo = require('mongodb');
var MongoClient = require('mongodb').MongoClient;
var GridStore = mongo.GridStore;
var ObjectID = require('mongodb').ObjectID;


function StreamGridFile(req, res, GridFile) {
  if(req.headers['range']) {
    // Range request, partialle stream the file
    console.log('Range Reuqest');
    var parts = req.headers['range'].replace(/bytes=/, "").split("-");
    var partialstart = parts[0];
    var partialend = parts[1];


    var start = parseInt(partialstart, 10);

    var end = partialend ? parseInt(partialend, 10) : GridFile.length -1;
    var chunksize = (end-start)+1;
  
    res.writeHead(206, {
      'Content-disposition': 'filename=xyz',
      'Accept-Ranges': 'bytes',
      'Content-Type': GridFile.contentType,
      'Content-Range': 'bytes ' + start + '-' + end + '/' + GridFile.length,
      'Content-Length': chunksize
    });

    // Set filepointer
    GridFile.seek(start, function() {
      // get GridFile stream
      var stream = GridFile.stream(true);

      // write to response
      stream.on('data', function(buff) {
        // count data to abort streaming if range-end is reached
        // perhaps theres a better way?
        if(start >= end) {
          // enough data send, abort
          GridFile.close();
          res.end();
        } else {
          res.write(buff);
        }
      });
    });

  } else {

    // stream back whole file
    console.log('No Range Request');
    res.header('Content-Type', GridFile.contentType);
    res.header('Content-Length', GridFile.length);
    var stream = GridFile.stream(true);
    stream.pipe(res);
  }
}

app.get('/files/get/:file', function(req, res) {
  new GridStore(db, new ObjectID(req.params.file), null, 'r').open(function(err, GridFile) {
    if(!GridFile) {
      res.send(404,'Not Found');
      return;
    }
    
    StreamGridFile(req, res, GridFile);
  });
});

app.use('/',       express.static(__dirname + '/client', { maxAge: 0 }));


// Initialize MongoDB connection once
MongoClient.connect("mongodb://localhost/test", function(err, database) {
  if(err) throw err;
  db = database;
});


app.listen(8080); // <<---- Start Listening to Port

Works Perfect 🙌🏻