jsrsasign
opensource free pure JavaScript cryptographic library supports RSA/RSAPSS/ECDSA/DSA signing/validation, ASN.1, PKCS#1/5/8 private/public key, X.509 certificate, CRL, OCSP, CMS SignedData, TimeStamp and CAdES and JSON Web Signature(JWS)/Token(JWT)/Key(JWK)
passport-jwt
Passport authentication strategy using JSON Web Tokens
zeesix
This package handles validation and verification of user roles and permissions
maskdata
Node module to mask various kinds of data in the required formats