Node & Express Endpoint always returns 200

I am having issues with a block of code in my node.js API. I have a simple JWT authentication API that is working as expected in terms of logging in and authentication. Howvever I cannot get express to return a response status other then 200.

If I enter an invalid username or password for the login end point, the response I receive is an empty 200 response, despite the fact the below code executes the catch block, and I return a response of 500 with my error. from the post method. This is getting lost somewhere, and converted to the empty 200 response. On succesfull login the return res.status(200).json.... code returns the correct response.

I have the same issue on all endpoints, all error responses are return as an empty 200 response.

Could any one advise.

app.post('/user/login', async (req, res) => {
    const email = req.body.user.email;
    const password = req.body.user.password;
    try {
      const authServiceInstance = new AuthService();
      const { user, token } = await authServiceInstance.Login(email, password);
      return res.status(200).json({ user, token }).end();
    } catch(e) {
      console.log('Error in login: ', e);
      return res.json(e).status(500).end();
    }
  })