axe-core

axe-core is a JavaScript accessibility testing engine. Its rules cover the WCAG criteria at levels A, AA and AAA, plus best-practice checks, and the rule list is in the project’s repository. A test includes the axe-core script in its fixtures or test system, and the engine reports violations and elements it could not decide. The API reference describes the options and result types. The package installs from npm or pnpm as a development dependency.

Worth knowing

The README describes axe-core as built to integrate with existing test environments, and its install routes are development dependencies.

The Deque product page offers commercial tools built around the engine, such as a site-wide monitoring product and a manual auditing product. They are separate products from the open-source package.