lab.js
The open-source study builder for high-precision behavioral research and online experiments.
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Reaction time measurement
Cognitive trial sequencing
Interactive surveys
jsPsych
4.9
Open Source Highly praised by the scientific community for its reliability, extensive documentation, and the shift it enabled from lab-based to web-based research.
The open-source JavaScript standard for millisecond-accurate behavioral research and cognitive data collection.
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Refined 3/2/2026
About jsPsych
jsPsych is a powerful, modular JavaScript library specifically engineered for the creation of behavioral experiments in the browser. By 2026, it has become the gold standard for decentralized psychological research, enabling researchers to build complex, millisecond-accurate experiments that run on any device with a modern web browser. The library's core architecture is built around the concept of a 'timeline,' where users define a sequence of events—from stimuli presentation to data collection trials—that are executed in a deterministic order. Its modular plugin system allows researchers to extend functionality easily, supporting everything from simple Likert scales to sophisticated video-based eye-tracking and real-time audio analysis. Positioned as a bridge between high-precision laboratory tools and the accessibility of the web, jsPsych leverages Web Audio API and high-resolution timing to ensure data integrity comparable to local software installations. Its 2026 market position is bolstered by deep integrations with data-hosting platforms like Pavlovia and JATOS, making it the primary choice for academic institutions, UX researchers, and AI developers conducting human-in-the-loop validation for behavioral models.
Core Capabilities
jsPsych is a powerful, modular JavaScript library specifically engineered for the creation of behavioral experiments in the browser.
