How To Solve NextAuth Error No Secret In Production

If you get the following error by NextAuth in production,

MissingSecret [MissingSecretError]: Please define a `secret` in production.

it means you are missing a secret that is used for various cryptographic tasks such as signing cookies, creating keys, etc. By default, one does not need to set a secret in development mode as a hash is automatically generated using the options object passed into the NextAuth function.

In production, however, you must explicitly set one using the environment variable NEXTAUTH_SECRET. You can easily generate a secret with the command below.

$ openssl rand -base64 32