Make redirection in express post, by react

I am using react and its router to make the redirect of my application. When I use a get instruction in my server express it works fine. But when I make a post instruction, it doesn't redirect. What I have to do?. Here is my code:

(I receive the response in the way that I expect, but after that, nothing happens)

lisaApp.post('/signup', (req, res) => {
  const validationResult = validateSignupForm(req.body);
  if (!validationResult.success) {
    return res.status(400).json({
      success: false,
      message: validationResult.message,
      errors: validationResult.errors
    });
  }

  var newClient = req.body
  newClient.clientemailname = newClient.userclient
  newClient.client_id = uuid.v4()

  delete newClient.confirmPassword

  ClientApi.saveClient(newClient, function (err, usr) {
    if (err) return res.status(500).send(err.message)

    console.log('ready to redirect') //Here, the response has a status "0k"
    res.redirect('/')
  });
});

via maoooricio