Create a new study
There are different ways to add a new study for JATOS: use a builder, with jsPsych, from scratch or by modifying an existing study. Then afterwards continue with Write your own Study - Basics and Beyond or Adapt Pre written Code to run it in JATOS.
Developement of a JATOS study usually happens on your local JATOS: Run an experiment with JATOS - Workflow
Use a builder - OpenSesame/OSWeb and lab.js
Experiment builders like OpenSesame/OSWeb and lab.js have a point-and-click UI. They are easy to use and you don't have to care for the programming part. But they come with the limitation that they only allow you to do what is possible in the UI. If you want more freedom consider jsPsych or write your own study.
Use jsPsych
jsPsych is a popular library for running behavioral experiments in a web browser. We have an own web page describing using jsPsych with JATOS.
Write your own study from scratch
Writing your own study gives your the most freedom since it allows you to do whatever is possible in a modern browser. But you will have to program your own code in JavaScript, HTML and CSS.
Go to the study sidebar by clicking on Studies in the header, top-left, then click on "+" and select New Study. Now an dialog opens where you can enter a title for the study and finally Add it. Next the study's page will open. Here you can edit its properties or add new components. All source code for your study has to got into the study assets folder. You can change the folder name in the study properties, but it is usually not necessary. The study assets folder is usually located in your JATOS installation folder.
Modify an existing study
Take an existing study (e.g. from Example Studies) as a prototype and modify it bit by bit. Go to the study sidebar by clicking on Studies in the header, top-left, then click on "+" and select Import Study. Then modify the source code in your study assets folder, which is usually in your JATOS installation folder.