Skip to main content
Version: v4


This is a list of warning output from NextAuth.js.

All warnings indicate things which you should take a look at, but do not inhibit normal operation.



Environment variable NEXTAUTH_URL missing. Please set it in your .env file.


These warnings are displayed on the terminal.


To remedy this warning, you can either:

Option 1: Pass a pre-regenerated Private Key (and, optionally a Public Key) in the jwt options.

jwt: {  signingKey: process.env.JWT_SIGNING_PRIVATE_KEY,
  // You can also specify a public key for verification if using public/private key (but private only is fine)  // verificationKey: process.env.JWT_SIGNING_PUBLIC_KEY,
  // If you want to use some key format other than HS512 you can specify custom options to use  // when verifying (note: verificationOptions should include a value for maxTokenAge as well).  // verificationOptions = {  //   maxTokenAge: `${maxAge}s`, // e.g. `${30 * 24 * 60 * 60}s` = 30 days  //   algorithms: ['HS512']  // },}

You can use node-jose-tools to generate keys on the command line and set them as environment variables, i.e. jose newkey -s 256 -t oct -a HS512.

Option 2: Specify custom encode/decode functions on the jwt object. This gives you complete control over signing / verification / etc.




This warning occurs when typeorm finds that the provided entities differ from the database entities. By default while not in production the typeorm adapter will always synchronize changes made to the entities codefiles.

Disable this warning by setting synchronize: false in your typeorm config


adapter: TypeORMLegacyAdapter({  type: 'mysql',  username: process.env.DATABASE_USERNAME,  password: process.env.DATABASE_PASSWORD,  host: process.env.DATABASE_HOST,  database: process.env.DATABASE_DB,  synchronize: false}),