@PackElend First Sorry for the late reply !!! 
I have few queries :
- I have cloned the joplin-Web in my local machine and I was able to run the frontend part made in vuejs successfully but I was having issue with the backend part made in python as it is asking for webclipper in .env file
- Should i have to open an account in nextcloud with a service from provider to start working ? Though I have tried but it is having sign up issue.
- As mentioned in the project I am trying to make the web client as per the requirements such as backend in PHP and front end in react but I need some help in nextcloud app signup.
Please help.