In SuiteScript when I'm trying to connect SFTP server with key file, I tried

sftp.createConnection({username:'username', keyId:'custkeykeyid', url:url, directory:'/', hostkey:myHostKey})

But I'm facing an error that says myHostKey is not correct. I tried to use public Key or private key, but not sure what that hostKey is. Could someone help me on this please?

You can obtain it from the host by running: ssh-keyscan -t rsa HOSTNAME

Thank you @CD