express-ntlm

Express middleware for NTLM authentication in Node.js. Current stable version 2.7.0. Maintained as of 2023. It provides NTLM authentication for Express apps, supporting both NTLMv1 and NTLMv2, with optional LDAP validation. Compared to alternatives like passport-ntlm, express-ntlm is simpler and does not require Passport.js. It handles NTLM negotiation, extracts user info (username, domain, workstation), and can validate against Active Directory via LDAP. Known issues with proxies and multiple users on same connection.