Tips for correctly implementing an authorize function in TypeScript with NextAuth.js

Question

Tips for correctly implementing an authorize function in TypeScript with NextAuth.js

Trying to implement the Credentials Provider in NextJs ("next": "^12.0.7") and NextAuth ("next-auth": "^4.1.2") using TypeScript has been a challenge. I am encountering difficulties in getting the function to work correctly.

Below is the code snippet from /pages/api/[...nextauth].ts

import NextAuth, {  } from "next-auth";
import CredentialsProvider from "next-auth/providers/credentials";
import { verifyOTP } from "@/lib/otp";

// Code block here...

export default NextAuth({
  
  // Configuration details...
  
})

Every time I attempt to build this application, I encounter the following error message:

Error message snippet here...

The contents of my .tsconfig file are as follows:

Contents of .tsconfig file goes here...

typescript next.js next-auth

Answer 1

Answer №1

The function authorize should return an object representing a user or false/null if the credentials are not valid.

The issue with your current logic is that it does not explicitly return false/null when the condition

res.result === "approved"

is false, leading to a type error. To resolve this, you can add a return statement for null after the if block.

authorize: async (credentials, _req) => {
    try {
        const res = await verifyOTP(credentials!.phone, credentials!.otp, credentials?.username);
        if (res.result === "approved") {
            return {
                id: res.user.id,
                email: res.user.email,
                name: res.user.phone,
                token: res.user.token
            };
        }
        return null; // Ensure to include this line to meet the `authorize` typings requirement
    } catch (e: any) {
        //const errorMessage = e.response.data.message;
        //throw new Error(errorMessage);
        return null;
    }
}

Additionally, there is no need to use Promise.resolve()/Promise.reject() around the user object and null, so I have removed those as well.

Answer 2

The function authorize should return an object representing a user or false/null if the credentials are not valid.

The issue with your current logic is that it does not explicitly return false/null when the condition

res.result === "approved"

is false, leading to a type error. To resolve this, you can add a return statement for null after the if block.

authorize: async (credentials, _req) => {
    try {
        const res = await verifyOTP(credentials!.phone, credentials!.otp, credentials?.username);
        if (res.result === "approved") {
            return {
                id: res.user.id,
                email: res.user.email,
                name: res.user.phone,
                token: res.user.token
            };
        }
        return null; // Ensure to include this line to meet the `authorize` typings requirement
    } catch (e: any) {
        //const errorMessage = e.response.data.message;
        //throw new Error(errorMessage);
        return null;
    }
}

Additionally, there is no need to use Promise.resolve()/Promise.reject() around the user object and null, so I have removed those as well.

Answer 3

Answer №2

An unresolved bug has been identified: https://github.com/nextauthjs/next-auth/issues/2701.

Answer 4

An unresolved bug has been identified: https://github.com/nextauthjs/next-auth/issues/2701.

Answer 5

Answer №3

The current problem persists in the most recent version of NextAuth, which is 4.20.1

To resolve this issue, it is necessary to correct a single type error in the return User interface that specifically requires the ID data to be a string and not a number. This limitation is acceptable since when using this provider, interactions with the database often involve retrieving strings rather than numbers.

CredentialsProvider({
      id: "password",
      name: "Email and Password",
      credentials: {
        email: { label: "Email", type: "text", placeholder: "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e983868187a98e84888085c78a8684">[email protected]</a>" },
        password: { label: "Password", type: "password" }
      },
      authorize: async (credentials, req) => {
        const user = { id: '1', name: 'J Smith', email: '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="9eeafbedeadefbe6fff3eef2fbb0fdf1f3">[email protected]</a>' };
        if (user) {
          return user;
        } else {
          return null;
        }
      }
    }),

Ensure that the User object includes an ID value as a string (e.g., from 1 to "1") to resolve the type error. There is no need to modify tsconfig.json for this correction.

Answer 6

The current problem persists in the most recent version of NextAuth, which is 4.20.1

To resolve this issue, it is necessary to correct a single type error in the return User interface that specifically requires the ID data to be a string and not a number. This limitation is acceptable since when using this provider, interactions with the database often involve retrieving strings rather than numbers.

CredentialsProvider({
      id: "password",
      name: "Email and Password",
      credentials: {
        email: { label: "Email", type: "text", placeholder: "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e983868187a98e84888085c78a8684">[email protected]</a>" },
        password: { label: "Password", type: "password" }
      },
      authorize: async (credentials, req) => {
        const user = { id: '1', name: 'J Smith', email: '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="9eeafbedeadefbe6fff3eef2fbb0fdf1f3">[email protected]</a>' };
        if (user) {
          return user;
        } else {
          return null;
        }
      }
    }),

Ensure that the User object includes an ID value as a string (e.g., from 1 to "1") to resolve the type error. There is no need to modify tsconfig.json for this correction.

Answer 7

Answer №4

Changing the strict mode in my tsconfig.json file from true to false has resolved the issue for me.

Take a look at the visual representation provided below.

Answer 8

Changing the strict mode in my tsconfig.json file from true to false has resolved the issue for me.

Take a look at the visual representation provided below.

Answer 9

Answer №5

To resolve this issue, ensure that the user object returned by the authorize function contains an "id" property with a numeric string value as shown below:

authorize: async (credentials, req) => {
        await connectDB();
        try {
          if (!credentials?.username) {
            return null;
          }
          if (!credentials?.password) {
            return null;
          }
          const user = {
            id: "1",
            username: "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="1f7d7a737370717a73735f78727e7673317c7072">[email protected]</a>",
            name: "Bello shehu",
          };
          // retrieve user from database
          return user;
        } catch (error) {
          return null;
        }

Answer 10

To resolve this issue, ensure that the user object returned by the authorize function contains an "id" property with a numeric string value as shown below:

authorize: async (credentials, req) => {
        await connectDB();
        try {
          if (!credentials?.username) {
            return null;
          }
          if (!credentials?.password) {
            return null;
          }
          const user = {
            id: "1",
            username: "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="1f7d7a737370717a73735f78727e7673317c7072">[email protected]</a>",
            name: "Bello shehu",
          };
          // retrieve user from database
          return user;
        } catch (error) {
          return null;
        }

Tips for correctly implementing an authorize function in TypeScript with NextAuth.js

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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