Related Experiment Video
Updated: Oct 26, 2025

Interactive and Visualized Online Experimentation System for Engineering Education and Research
Published on: November 24, 2021
lab.js: A free, open, online study builder.
Felix Henninger1, Yury Shevchenko2, Ulf K Mertens3
1Mannheimer Zentrum für, Europäische Sozialforschung (MZES), University of Mannheim, A5, 6 (section A), 68159, Mannheim, Germany. mailbox@felixhenninger.com.
Researchers can now easily build web-based experiments for online or lab data collection using lab.js, a free, open-source tool. This experiment builder offers a visual interface and high-accuracy timing for flexible and reproducible scientific studies.
Area of Science:
- Psychology
- Computer Science
- Research Methodology
Background:
- Web-based data collection is growing due to its flexibility and efficiency.
- Creating browser-based experiments often requires manual coding.
- Existing tools are specialized for lab or survey research, not browser experiments.
Purpose of the Study:
- Introduce lab.js, a free, open-source experiment builder.
- Simplify the creation of online and in-laboratory data collection studies.
- Enable high-accuracy timing for browser-based experiments.
Main Methods:
- lab.js offers a visual interface for study design without coding.
- Studies can be customized with HTML, CSS, and JavaScript.
- High accuracy and precision in presentation and response time measurement.
Main Results:
- lab.js facilitates easy study creation for both online and laboratory settings.
- Experiments can be deployed online, to cloud hosting, or exported to web servers.
- Studies are shareable, archivable, and reusable, promoting transparent replication.
Conclusions:
- lab.js empowers researchers to build sophisticated browser-based experiments easily.
- The tool enhances reproducibility and facilitates open science practices.
- It provides accurate timing crucial for experimental research.
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