Connecting to the Default Server

Some libraries also provide a special way to connect to a default url, which is generally nats://localhost:4222:

Go

nc, err := nats.Connect(nats.DefaultURL)
if err != nil {
    log.Fatal(err)
}
defer nc.Close()

// Do something with the connection

Java

Connection nc = Nats.connect();

// Do something with the connection

nc.close();

JavaScript

let nc = NATS.connect();
nc.on('connect', (c) => {
    // Do something with the connection
    doSomething();
    // When done close it
    nc.close();
});
nc.on('error', (err) => {
    failed(err);
});

Python

nc = NATS()
await nc.connect()

# Do something with the connection

await nc.close()

Ruby

require 'nats/client'

NATS.start do |nc|
   # Do something with the connection

   # Close the connection
   nc.close
end

TypeScript

// will throw an exception if connection fails
let nc = await connect();
// Do something with the connection

// When done close it
nc.close();


// alternatively, you can use the Promise pattern
let nc1: Client;
connect()
    .then((c) => {
        nc1 = c;
        // Do something with the connection
        nc1.close();
    });
    // add a .catch/.finally

C

natsConnection      *conn = NULL;
natsStatus          s;

s = natsConnection_ConnectTo(&conn, NATS_DEFAULT_URL);
if (s != NATS_OK)
  // handle error

// Destroy connection, no-op if conn is NULL.
natsConnection_Destroy(conn);