SvelteKit auth with GitHub OAuth

To set up you will need to create your own GitHub OAuth app, in GitHub go to Settings > Developer settings > OAuth Apps > New OAuth App.

Set the Homepage URL to your localhost development port (example: http://localhost:3000/) and the Authorisation Callback URL (example: http://localhost:3000/callback)

Take a note of the CLient ID and generate a new client secret, add those values to a .env file, see .env.sample for an example.

Demo

https://sveltekit-auth-two.vercel.app/

Thanks

Full credit and thanks to Tom Wilson and his YouTube video detailing this: https://www.youtube.com/watch?v=D4ZcbudB1n0