A JavaScript build artifact is a file produced when a web application is compiled, bundled, or minified for deployment. Common examples include bundles, chunk files, and source maps. These files are often copied to a public web server or CDN so browsers can load them directly after release.
In cyber security, build artifacts matter because they can expose more than application code. If a secret, API endpoint, internal path, or debugging data is accidentally included, attackers can download the public file and harvest it without touching the backend. Public artifacts have been used to discover cloud credentials, reverse engineer application logic, and identify weak points for later exploitation. Defenders reduce this risk by scanning build outputs for secrets, excluding sensitive files from release, using temporary credentials instead of embedded keys, and treating the CI/CD pipeline as part of the attack surface.