Javascript library for running experiments developped with Open Sesame in a browser environment.
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Copyright 2016-2018 Jaap Bos (@shyras), Daniel Schreij (@dschreij), and Sebastiaan Mathôt (@smathot)


OSWEB is an online runtime for OpenSesame experiments. OpenSesame is a open-source program for creating behavioral experiments. For more information, see:

How to build

OSWeb is built using node.js and webpack, and therefore the installation process should be pretty straightforward:

First, go to the root of the OSWEB folder and install the dependencies with the command:

npm install

Then build OSWEB by running:

npm run dev

This will generate the application in the public_html folder.

If you want to build OSweb with production settings you can run:

npm run prod

The production version is uglified and minified, which results in smaller file sizes, and thus shorter loading times when serving Osweb from a web server. The building process does take considerably longer because of these steps.

How to run

Open public_html/index.html in a webbrowser!

Alternatively, you can start a development server with:

npm start

Once it is started, you can visit http://localhost:3000 in your browser and you should see the osweb interface. The devserver is especially useful if you are working on the source of osweb itself, because it employs hot module reloading (HMR). This implies that whenever you change a file and save it to disk, it is automatically reloaded in the browser without having to refresh the page each time.

Unit tests

Unit tests can be run with

npm test


OSWEB is distributed under the terms of the GNU General Public License 3. The full license should be included in the file COPYING, or can be obtained from: