How to upload files along with json data?

Question

Node.js

There is a form
Name
Date
Password
Avatar
server.js

fileUpload = require('express-fileupload');
app.use( fileUpload() );
app.use( bodyParser.json() );
app.use( bodyParser.urlencoded({ extended: false }) );
....

Next router

publicRouter.put('/finishUserRegistration', ctrlAuth.finishUserRegistration);

And the handler

module.exports.finishUserRegistration = function(req, res) {
    console.log(req.files)
};

req.files returns undefined. What is the problem?