What is the reason behind the mandatory credentials option for the CredentialsProvider?

When using NextAuth.js with a custom sign in page, some code examples for the credentials provider do not include the credentials option in the CredentialsProvider. According to the documentation (here), the credentials option is meant to automatically "generate a suitable form on the sign in page" based on the specified properties. Since I have manually coded my custom sign in page as recommended in the documentation (here), I do not require the automatically generated fields from the credentials option. However, due to using Typescript, omitting the credentials option results in a type error. Is it possible to exclude this option if not needed, or is it mandatory for other reasons?

Example with credentials option:

...
providers: [
  CredentialsProvider({
    name: "Credentials",
    credentials: {
      username: { label: "Username", type: "text", placeholder: "jsmith" },
      password: {  label: "Password", type: "password" }
    },
    async authorize(credentials, req) {
      const user = { id: 1, name: "J Smith", email: "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e389908e8a978ba3869b828e938f86ce899491">[email protected]</a>" }

      if (user) {
        return user
      } else {
        return null
      }
    }
  })
]
...

Example without credentials option:

import CredentialsProvider from "next-auth/providers/credentials";
...
providers: [
  CredentialsProvider({
    name: "Credentials",
    async authorize(credentials, req) {
      const user = { id: 1, name: "J Smith", email: "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="9cf6eff1f5e8f4dcf9e4fdf1ecf0f9b2fff3f1">[email protected]</a>" }

      if (user) {
        return user
      } else {
        return null
      }
    }
  })
]
...

PS: The name option may also be unnecessary when using a custom sign up page. It would be helpful to have the ability to exclude that as well...

Answer №1

In the realm of NextAuth.js, the credentials option within the CredentialsProvider is not an absolute necessity, but it does serve a specific function. As previously noted, its primary purpose is to automatically create a suitable form on the sign-in page based on the properties outlined in the credentials object.

If you have crafted a custom sign-in page and manually coded your form fields, you can choose to exclude the credentials option without any adverse effects. Nonetheless, if TypeScript is being used and type errors crop up due to the absence of the credentials option, there are several avenues you can explore:

  1. Supply a Placeholder credentials Object:

To satisfy TypeScript's type checking requirements, you can provide an empty or placeholder credentials object. This workaround allows you to maintain your customized sign-in page while sidestepping type-related issues. Take a look at this illustrative example:

import { CredentialsProvider } from "next-auth/providers/credentials";

const credentials = {}; // Placeholder credentials object

export default NextAuth({
  providers: [
    CredentialsProvider({
      credentials,
      authorize: async (credentials) => {
        // Insert your unique authorization logic here
      },
    }),
    // Additional providers...
  ],
  // Other configuration options for NextAuth...
});
  1. Type Assertion:

If having an empty credentials object doesn't sit well with you, employing type assertion provides an alternative solution. By using type casting, you inform TypeScript that the credentials object is of type any, effectively bypassing type validation for that specific property. Refer to this example:

import { CredentialsProvider } from "next-auth/providers/credentials";

const credentials = {} as any; // Type casting as any

export default NextAuth({
  providers: [
    CredentialsProvider({
      credentials,
      authorize: async (credentials) => {
        // Include your customized authorization process here
      },
    }),
    // Additional providers...
  ],
  // Other setup options for NextAuth...
});

Both of these strategies enable you to exclude the credentials option while adhering to TypeScript's type validation standards. Be mindful that revisiting the credentials option may be warranted if you ever revert to utilizing NextAuth.js' auto-generated form fields for your sign-in page.

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