From a server to a Kerberos realm or from a web browser to a kerberos realm?
Nothing exists for a web browser to pass Kerberos protocol TGT and TGT requests directly to a Kerberos realm due to the browser (currently) unable to handle the cryptographic routines necessary for this functionality.
If you mean from a server to kerberos realm you could always search the NPM registry,
https://www.npmjs.org/package/node-krb5 looks promising.