# jspsych/jsPsych

Create behavioral experiments in a browser using JavaScript

Repository: https://github.com/jspsych/jsPsych
Canonical: https://ross.abutalabs.com/products/jspsych
Homepage: http://www.jspsych.org
Language: TypeScript
License: MIT
License Family: permissive
Topics: javascript, experiments, science, psychology, psychology-experiments, research, jspsych, experimental-design
Last push: 2026-08-13T18:20:13+00:00

## Health v2 (maintenance only)
Score: 93/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 97, release rhythm 83, longevity 100
- inputs: {"age_days": 5223, "days_push": 20, "days_rel": 38, "gap_med": 0, "n_releases_24m": 112}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1215, forks 732 (observed 2026-08-28T04:04:01.147098+00:00)

## What it is
jsPsych is a JavaScript/TypeScript framework for building behavioral experiments that run in a web browser. Experiments are assembled from plugins (stimulus presentation, response collection, eye-tracking calibration) arranged on a timeline.

## Use cases
- run psychology experiments online in the browser
- build a reaction time task
- collect behavioral research data from participants
- create drag-and-drop image sorting tasks
- calibrate web-based eye tracking with WebGazer
- present text, image, audio, or video stimuli and record responses

## When to choose
- you need browser-based behavioral or cognitive experiments
- you want a plugin/timeline model with many ready-made task plugins
- you need precise response-time measurement in a web experiment

## When to avoid
- you need lab-grade millisecond timing on native hardware
- you are building a general-purpose web app rather than an experiment
- you need offline desktop experiment software

## Facets
- artifact type: framework
- maturity: active
- function: ui-components, plugin-system, data-science
- domain: education, web-development, data-science
- platform: browser
- tags: psychology-experiments, behavioral-research, reaction-time, online-experiments, stimulus-presentation, eye-tracking, typescript, javascript, nodejs

## Member repositories
- jspsych/jsPsych (main) score 93

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:01.147098+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:17:16.527830+00:00, confidence not recorded.
  - readme: https://github.com/jspsych/jsPsych (fetched 2026-08-28T04:04:01.147098+00:00, sha b2be33b8450b)
  - homepage: http://www.jspsych.org (fetched 2026-08-29T12:25:19.637110+00:00, sha b8cd1f17c8b2)
  - registry_npm: https://registry.npmjs.org/jspsych (fetched 2026-08-29T12:25:19.646737+00:00, sha 407f60e27a4c)
- Data as of 2026-08-30T08:39:29.467469+00:00.