TypeError: router.push is not a function in Next.js: Causes and How to Fix

Verify the Import Statement

• Ensure you are using the correct import statement for Next.js's `useRouter` hook.

 

• The import should look like this:

import { useRouter } from 'next/router';

Check if useRouter is Called Inside a Component

• Ensure that `useRouter` is used within a React component. Hooks must be called at the top level of a functional component, not inside loops, conditions, or nested functions.

export default function MyComponent() {
  const router = useRouter();

  function navigateToPage() {
    router.push('/destination');
  }

  return <button onClick={navigateToPage}>Go to Destination</button>;
}

Confirm the Context of router

• Check that `router` is correctly initialized by calling `useRouter()` within your component, which should return an object with the `push` function.

 

• If you are seeing `router.push is not a function`, verify that `router` is not reassigned or mutated in your code, which could overwrite it with an incompatible value.

Ensure Using Next.js Functional Components

• Ensure your component is a functional component as hooks are meant for functional components only in React, and `useRouter` is a React hook.

const HeaderComponent = () => {
  const router = useRouter();

  return (
    <button onClick={() => router.push('/home')}>
      Home
    </button>
  );
};

Upgrade Next.js

• Having an outdated version of Next.js might cause certain functionalities to not work as expected. Upgrade Next.js to the latest version by running:

npm update next

Check Custom Router Configuration

• If you are using a custom router, ensure that your custom configuration doesn't interfere with the standard `useRouter` behavior.

 

• Review and test configurations in `next.config.js` to eliminate conflicts that may affect routing.

Inspect Compilation and Build Errors

• Sometimes, build or compilation issues might cause unexpected behavior. Run the following command to identify any underlying problems:

next build

Refactor Problematic Code

• In some cases, the problem may stem from incorrect logic usage or a complex state management issue in your components. Consider reviewing and refactoring potentially problematic sections to ensure routers are used correctly.

Consult Next.js Documentation and Community

• Review the official Next.js documentation for the latest information on routing and examples.

 

• Seek assistance from the Next.js community on forums like StackOverflow or the Next.js GitHub repository for complex or unique issues.