env-ci is a Node.js package that detects the Continuous Integration (CI) environment your code is running in. It identifies popular CI services like Travis CI, CircleCI, GitLab CI, and more. The package extracts relevant environment variables specific to each CI provider, standardizing access to build metadata such as commit SHA, branch name, and build number. This simplifies conditional logic based on the CI environment, enabling cleaner and more portable CI configurations across different platforms. env-ci is a valuable tool for developers building CI-aware applications and libraries.