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So I'm trying to use the mongoose-gridfs module with express but I get the following error when I try to run my express server.

Error: Mongoose is not connected 
at new GridFSStorage (C:UsersBARMANDocumentsCodeszubis-martnode
_modulesmongoose-gridfslibstorage.js:43:11) 
at module.exports (C:UsersBARMANDocumentsCodeszubis-martnode_mo
dulesmongoose-gridfslibstorage.js:472:18) 
at Object.<anonymous> (C:UsersBARMANDocumentsCodeszubis-martrou
tesusers.js:24:42) 
at Module._compile (module.js:653:30) 
at Object.Module._extensions..js (module.js:664:10) 
at Module.load (module.js:566:32) 
at tryModuleLoad (module.js:506:12) 
at Function.Module._load (module.js:498:3) 
at Module.require (module.js:597:17) 
at require (internal/module.js:11:18) 
at Object.<anonymous> (C:UsersBARMANDocumentsCodeszubis-martser
ver.js:15:15) 
at Module._compile (module.js:653:30) 
at Object.Module._extensions..js (module.js:664:10) 
at Module.load (module.js:566:32) 
at tryModuleLoad (module.js:506:12) 
at Function.Module._load (module.js:498:3) 

Here's where I think the problem is from ##

const express = require('express');
const bcrypt = require('bcryptjs');
const fs = require('fs');
const mongoose = require('mongoose');
const multer = require('multer');
const passport = require('passport');

const config = require('../config/database');

mongoose.connect(config.database, 
 useNewUrlParser: true
);

let conn = mongoose.connection;

conn.once('open', () => 
 console.log('Database File Upload Connection Established Successfully.');
);

conn.on('error', (err) => 
 console.log('File Connection Error... ' + err);
);

const gridfs = require('mongoose-gridfs')(
 collection: 'images',
 model: 'Image',
 mongooseConnection: conn
);

My Connection string if okay but I just can't seem to figure it out. Really need help please. Thanks Guys!

You should make sure the connection is opened first then initialize gridfs,

conn.once('open', () => 
 global.gridfs = mongooseGridFS(
 collection: 'images',
 model: 'Image',
 mongooseConnection: conn
 );
);

As You may see from trace issue happens when it tries to create GridFSStorage instance and throws error because mongoose is not ready:

Error: Mongoose is not connected

at new GridFSStorage (C:UsersBARMANDocumentsCodeszubis-martnode
_modulesmongoose-gridfslibstorage.js:43:11)

Make sure mongoose connected to db before attaching gridfs.

Here is fix:

const express = require('express');
const bcrypt = require('bcryptjs');
const fs = require('fs');
const mongoose = require('mongoose');
const mongooseGridFS = require('mongoose-gridfs');
const multer = require('multer');
const passport = require('passport');


const config = require('../config/database');

mongoose.connect(config.database, 
 useNewUrlParser: true
);

let conn = mongoose.connection;

conn.once('open', () => 
 console.log('Database File Upload Connection Established Successfully.');

 global.gridfs = mongooseGridFS(
 collection: 'images',
 model: 'Image',
 mongooseConnection: conn
 );
);

conn.on('error', (err) => 
 console.log('File Connection Error... ' + err);
);

P.S. I've read mongoose-gridfs manual which insantiated exactly as in Your question which is incorrect.

Since in code source at line #43 it immediately checks for connection state - which does tells that documentation is not correct.