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How to convert MERN app to mobile app using any framework

I enjoy MERN development and I actually prefer it to Meteor, etc.
With Meteor however, it is pretty convenient to convert the website into a mobile app with a few commands.
I was wondering if there is anyway to convert a MERN website into a mobile app using one of the "wrappers" available like PhoneGap, etc.?
What options do I have?
What do you suggest?

You could try using "Cordova" of Apache which is a mobile application development framework. This will help you port the web application to different mobile platform.

Develop app just to showcase a website on ios and android

So what I want to do is, "develop" an app where it main purpose is just to open a website. I need that on android and ios. Is there an online website to do just that?
I jused to know a website, where you could develop for various platforms (PHP, Java, Object C for iOs) and even test your code online.
Somehow I can't find it anywhere. Thank in advance if you can either show me the website again or find me a new website to do just that.
Regards!
Update:
Found the website: http://www.programmr.com/

I think you're referencing PhoneGap.
PhoneGap allows you to build native applications using HTML/CSS/JS for all mobile operating systems.

If all you want is for your iPhone App and Android App to open up a website "inside" of the application, you will want to use a webView. This will allow you to have your application listed on the iOS App Marketplace and the Android Google Play Store.
EDIT: This will definitely work on Android. You must get pass Apples app approval process to get on iOS of course.

What is the difference between installing JQuery Mobile application on a device using Google Play Store and using PhoneGap

What is the difference between installing JQuery Mobile application on a device using Google Play Store and using PhoneGap?
Also, is there other tools we can use to install Jquery application on devices besides PhoneGap?
Thank you!!!!

You don't install an application using PhoneGap. Phonegap is a framework that lets you develop apps using html 5/javascript. After you develop your app you still have to publish it on Google Play if you want users to install it. Jquery Mobile is also a framework, designed to develop webpages optimized for mobile screens.
There is a good post here Explaining the differences between phonegap and jquery mobile.
There are several other mobile web frameworks such as Titanium, sencha, kendo ui, and I am sure you can find others if you run a quick search for it.
You need to read a little about them and understand the differences and advantages between them. Googling "Phonegap vs Titanium" for example will give you a good start point to understand the difference between them.

PhoneGap is just a cross-platform framework to develop mobile applications. You can use HTML, CSS, JS (incl. jQuery and jQuery Mobile) to develop in PhoneGap. In order to test applications, you can transfer them to your device using tools provided by PhoneGap and the Android SDK.
But in order to publish your application and make it available for others in the Google Play Store, you have to create a developer account ($25 at the time of writing this) and upload your application package (APK) there.
PhoneGap Guide (read "deploy to device")
Android Guide "Using hardware devices"
Android Guide "Get started with publishing"
There are also other cross-platform frameworks available such as "Titanium". Keep in mind that jQuery Mobile is only a Javascript (jQuery) extension to help building user interfaces that resemble conventional app behavior and look. It is not a complete framework to build your application.

Phone Gap or native Android wrapper?

I want to develop an application which works both in a regular browser and as an Android app. Both seem suitable but would I be right in saying if I went with Phone Gap, deploying the same html content as a regular, server hosted website is not trivial and would require modification? Also, are multi page applications not desirable in a Phone Gap wrapper?
Are there any alternatives I should consider? I'm surprised someone hasn't already written an Android wrapper with all the hardware access wiring done already. Or have they?

There are few things you should know,
If you are going to publish your app also on iOS, you can't use server hosted website for your app.
All of your basic functionality must stand on your app assets, is one of the iOS guidelines, and its also make-sense for best ui performance (both iOS & Android).
Use server-side wisely, when you want to fetch data which have to be up-to-date.
there are some new mobile browser features which will be available in the future, that allow your website to use the device hardware functions:
Device API on W3C
Good luck dude ;)

You can try with jquery mobile framework:
http://www.jquerymobile.com
It is jquery based framework for developing web apps that works on standard web and on multiple mobile devices (with cordova)

Offline Web Application HTML5 on Android

I want to develop a HTML5 Web App.
I read that in HTML5, you can use the new feature "Offline Web Applications"
With the *.manifest file
I read an article from november 2010, that this feature only works on the iOS platform.
Does it work on Android now?

Yes. It works on Android as well as iOS and most desktop browsers. You don't need PhoneGap unless you want to access native features or deploy to the App store.
UPDATE:
Check out this chapter from Jonathan Stark's book: Building Android Apps with HTML, CSS, and JavaScript.

In general, http://mobilehtml5.org/ provides nice mobile compatibility tables to answer this and other similar questions.

Yes it can. Here's an example for an offline game:
http://www.davidgranado.com/2010/11/make-a-set-mobile/
The one thing that sucks is that iOS generates a nice icon automatically. However, android doesn't. Also, I noticed that on random versions of android, it will display an error popup about the fact that it can't connect to the internet, but still runs fine after that.