Skadajs

Skadajs is a lightweight JavaScript library designed to help web developers instrument, collect, and analyze client-side performance and usage data. It emphasizes a small runtime footprint, minimal configuration, and a modular plugin system to adapt to different project needs.

Its core design centers on a small core API that can be extended with plugins for metrics, event tracking, privacy controls, and data export. Skadajs can capture standard navigation and resource timing data, along with custom events defined by the application. The library is designed to run with or without critical dependencies and to ship with optional adapters for major frontend frameworks.

Usage is straightforward: install via a package manager, instantiate the core Skada object, and register plugins or instrumentation hooks. Data can be exported to JSON, sent to remote endpoints, or consumed directly within the client for visualization. Privacy features include opt-out controls and configurable data sampling.

The project is maintained by an active open-source community and welcomes contributions. Users typically cite its small footprint, clear API, and easy integration as advantages, while some deployments require careful attention to privacy and data governance.

Related topics include web performance measurement, browser timing APIs, and client-side analytics approaches.