nc, err := nats.Connect("127.0.0.1", nats.UserCredentials("path_to_creds_file"))
if err != nil {
	log.Fatal(err)
}
defer nc.Close()

// Do something with the connection

Options options = new Options.Builder().
            server("nats://localhost:4222").
            authHandler(Nats.credentials("path_to_creds_file")).
            build();
Connection nc = Nats.connect(options);

// Do something with the connection

nc.close();

// credentials file contains the JWT and the secret signing key
let credsFile = path.join(confDir, 'credsfile.creds');

let nc = NATS.connect({
    url: server.nats,
    userCreds: credsFile
});

nc = NATS()

async def error_cb(e):
    print("Error:", e)

await nc.connect("nats://localhost:4222",
                 user_credentials="path_to_creds_file",
                 error_cb=error_cb,
                 )

# Do something with the connection

await nc.close()

// credentials file contains the JWT and the secret signing key
let credsFile = path.join(confDir, 'credsfile.creds');

let nc = await connect({
    url: server.nats,
    userCreds: credsFile
});