Step-by-Step Guide to Implementing Rainbow Kit and Wagmi in Next.js

Yash JainYash Jain
5 min read

Table of contents

Introduction

This guide will walk you through the process of implementing Rainbow Kit with Wagmi in a Next.js application. Rainbow Kit is a React library that makes it easy to add wallet connection to your dApp, while Wagmi is a collection of React Hooks for Ethereum that makes it easy to work with wallets, ENS, contracts, transactions, and more.

Prerequisites

  • Node.js (v14 or later)

  • npm or yarn

  • A Next.js project

Step 1: Installation

First, install the necessary dependencies:

npm install @rainbow-me/rainbowkit wagmi viem @tanstack/react-query

Step 2: Configuration

Create a wagmi.ts file in your project root to configure Wagmi and Rainbow Kit:

import { getDefaultConfig } from '@rainbow-me/rainbowkit';
import {
  arbitrum,
  base,
  mainnet,
  optimism,
  polygon,
  sepolia,
} from 'wagmi/chains';

export const config = getDefaultConfig({
  appName: 'Your App Name',
  projectId: process.env.NEXT_PUBLIC_WALLET_CONNECT_PROJECT_ID as string,
  chains: [
    mainnet,
    polygon,
    optimism,
    arbitrum,
    base,
    ...(process.env.NEXT_PUBLIC_ENABLE_TESTNETS === 'true' ? [sepolia] : []),
  ],
  ssr: true,
});

Make sure to set the NEXT_PUBLIC_WALLET_CONNECT_PROJECT_ID in your .env.local file.

Step 3: Create a Providers Component

Create a providers.tsx file to wrap your application with the necessary providers:

'use client';

import * as React from 'react';
import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
import { WagmiProvider } from 'wagmi';
import { RainbowKitProvider } from '@rainbow-me/rainbowkit';

import { config } from './wagmi';

const queryClient = new QueryClient();

export function Providers({ children }: { children: React.ReactNode }) {
  return (
    <WagmiProvider config={config}>
      <QueryClientProvider client={queryClient}>
        <RainbowKitProvider>{children}</RainbowKitProvider>
      </QueryClientProvider>
    </WagmiProvider>
  );
}

Step 4: Update Your Root Layout

Modify your app/layout.tsx file to include the Providers and Rainbow Kit styles:

import type { Metadata } from "next";
import { Providers } from './providers';
import '@rainbow-me/rainbowkit/styles.css';
// ... other imports

export default function RootLayout({
  children,
}: {
  children: React.ReactNode;
}) {
  return (
    <html lang="en">
      <body>
        <Providers>
          {/* Your other providers and components */}
          {children}
        </Providers>
      </body>
    </html>
  );
}

Step 5: Using the ConnectButton

Now you can use the ConnectButton component from Rainbow Kit in any of your components. For example, in a Navbar component:

import { ConnectButton } from '@rainbow-me/rainbowkit';

const Navbar: React.FC = () => {
  return (
    <nav>
      {/* Other navbar items */}
      <ConnectButton />
    </nav>
  );
};

export default Navbar;

Best Practices

  1. Environment Variables: Always use environment variables for sensitive information like project IDs.

  2. Server-Side Rendering (SSR): The ssr: true option in the Wagmi configuration ensures compatibility with Next.js SSR.

  3. Type Safety: Utilize TypeScript for better type-checking and developer experience.

  4. Error Handling: Implement proper error handling for wallet connection failures and network issues.

  5. Responsive Design: Ensure your wallet connection UI is responsive and works well on both desktop and mobile devices.

Troubleshooting Common Errors

During the implementation of Rainbow Kit with Wagmi in your Next.js application, you may encounter various errors. Here's a list of common issues and their solutions:

1. WagmiProviderNotFoundError

Error Message:

WagmiProviderNotFoundError: `useConfig` must be used within `WagmiProvider`.

Solution:

  • Ensure that all components using Wagmi hooks or Rainbow Kit components are wrapped within the Providers component.

  • Check that your Providers component is correctly placed in your component tree, typically in the root layout.

2. RainbowKitProvider Error

Error Message:

Error: RainbowKitProvider must be inside WagmiProvider

Solution:

  • Verify that your Providers component is set up correctly, with RainbowKitProvider nested inside WagmiProvider.

  • Double-check the order of providers in your Providers component.

3. Invalid Hook Call

Error Message:

Invalid hook call. Hooks can only be called inside of the body of a function component.

Solution:

  • Ensure you're not using Rainbow Kit or Wagmi hooks outside of React functional components.

  • If using Next.js 13+ with the App Router, add 'use client' at the top of files containing client-side only code.

4. Hydration Failed

Error Message:

Hydration failed because the initial UI does not match what was rendered on the server.

Solution:

  • This often occurs with SSR. Ensure you're using dynamic imports with { ssr: false } for components that should only render on the client side.

  • Alternatively, wrap the problematic component with a client-side only wrapper.

5. ProjectId Not Found

Error Message:

ProjectId not found. Please provide a project id.

Solution:

  • Verify that you've set the NEXT_PUBLIC_WALLET_CONNECT_PROJECT_ID in your .env.local file.

  • Ensure that you're correctly accessing the environment variable in your Wagmi configuration.

6. Chain Not Configured

Error Message:

Chain "X" not configured

Solution:

  • Check that you've properly configured all the chains you intend to use in your wagmi.ts file.

  • Ensure you're not trying to connect to a chain that's not included in your configuration.

7. Module Not Found

Error Message:

Module not found: Can't resolve '@rainbow-me/rainbowkit'

Solution:

  • Run npm install @rainbow-me/rainbowkit to ensure the package is installed.

  • Check your package.json to verify the package is listed in the dependencies.

General Troubleshooting Tips

  1. Clear Cache and Reinstall Dependencies: Sometimes, clearing your Next.js cache and reinstalling dependencies can resolve mysterious issues:

     rm -rf .next
 rm -rf node_modules
 npm install

  2. Check Version Compatibility: Ensure that your versions of Next.js, Rainbow Kit, and Wagmi are compatible with each other.

  3. Console Logging: Use console.log statements to debug and track the flow of your application.

  4. React DevTools: Use React DevTools to inspect your component tree and ensure providers are wrapping components correctly.

  5. TypeScript: If you're using TypeScript, make sure your types are up to date and correctly imported.

By addressing these common issues and following the troubleshooting tips, you should be able to resolve most problems encountered while implementing Rainbow Kit with Wagmi in your Next.js application.

Conclusion

By following this guide, you've successfully implemented Rainbow Kit with Wagmi in your Next.js application. This setup provides a robust foundation for building decentralized applications with easy wallet connection functionality.

Remember to keep your dependencies updated and refer to the official documentation of Rainbow Kit and Wagmi for advanced features and updates.

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Written by

Yash Jain
Yash Jain

Blockchain Developer