How do I get the Auth0 log in button component to work on localhost as well?

I have my app hosted on netlfiy and the Auth0 log in button component redirects me to the correct place but only on the hosted site. When I start up my server on local host and click the same button I get an error saying

Callback URL mismatch.
The provided redirect_uri is not in the list of allowed callback URLs.
Please go to the [Application Settings page]( and make sure you are sending a valid callback URL from your application.

Hey there @gtrman97!

Have you added the localhost callback url in your application settings in Auth0? For example, our React sample app requires that http://localhost:3000 is added as an allowed callback url in application settings.

Hi, yes I have added it. Are they supposed to be separated by commas like this?, http://localhost:5173

I still have the same issue.

1 Like

Thanks for confirming - Yes, that should be fine!

Do you mind sharing an example of what the /authorize request looks like?

Not entirely sure what you mean by authorize request. Here is my main.jsx:

import React from "react";
import ReactDOM from "react-dom/client";
import { BrowserRouter, Routes, Route } from "react-router-dom";
import App from "./App";
import { Auth0Provider } from "@auth0/auth0-react";
import "./index.css";

          <Route path="/*" element={<App />}></Route>

and the button component I rendered on a page from the docs:

import React from "react";
import { useAuth0 } from "@auth0/auth0-react";

const LoginButton = () => {
  const { loginWithRedirect } = useAuth0();

  return <button onClick={() => loginWithRedirect()}>Log In</button>;

export default LoginButton;

Now I tried running the readiness check and it tells me

Allowed Callback URLs should not include Localhost

Thanks for sharing your code - It’s hard to know for sure, but everything looks OK to me here.

If you capture a har file during the attempted login file I should be able to see the authorize request itself - Alternatively, you could inspect the network requests and extract it that way. I am just looking for the request that begins https://{YOUR_DOMAIN}

Have you had the chance to take a look at our React sample and test the login flow using localhost there?

Keep us posted!

This makes sense for production.

This is all I see in the dev tools network tab after clicking on the log in button that is supposed to take me to the Auth0 log in form.

Hey @gtrman97 I apologize for the delayed response here - Were you ever able to get this working?

If not, feel free to DM a har file of your login flow and I’d be happy to take a closer look to see if there is anything I can see that stands out.


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