Typescript & pg & Express & Psql on Docker container: "Error: Connection terminated unexpectedly"

I have problem connecting to my Db that is running on a container on Docker using postres image:

docker run --name postgres-container -p 2345:2345 -e POSTGRES_PASSWORD=password123 -e POSTGRES_USER=admin -d postgres

My typescript code (is on a ts file)

app.get("/hello", async (request: Request, response: Response) => {
    const pool = new Pool({
        user: 'admin',
        host: 'localhost',
        database: 'betsdb',
        password: 'password123',
        port: 2345,
    });

     console.log("trying connection");
     const client = await pool.connect();
     console.log("succed");
});

When executing the "await pool.connect" it gives the error "Error: Connection terminated unexpectedly"

In docker i can interact with the DB without any problem, the password works and everyting alright. My container is running on http://localhost:2345 i verify this on docker desktop.

I really would appreciate any kind of solution please. I have been looking for a solution the past hours in stackoverflow found similar questions, different kind of possible solutions but nothing worked.