ACME Client for Node.js

acme-client is a simple and unopinionated Node.js library designed to interact with ACME (Automatic Certificate Management Environment) APIs, such as those provided by Let's Encrypt, Buypass, Google, and ZeroSSL. It adheres to RFC 8555 for ACME protocol communication. The current stable version is 5.4.0, requiring Node.js >= 16.0.0. The library primarily focuses on certificate management tasks, including account registration, order processing, and challenge fulfillment, supporting both RSA and ECDSA keys through native Node.js cryptography. It differentiates itself by being unopinionated and providing direct control over the ACME workflow, rather than an 'auto-mode' by default (though auto mode is available), and ships with TypeScript types for improved developer experience. While major versions have specific Node.js requirements, the project appears to release updates as needed, rather than on a fixed cadence.