next-siwe

Sign in with Ethereum for Next.js. Read more on SIWE

Getting Started

Install next-siwe and dependencies:

npm i next-siwe wagmi ethers

Create the SIWE endpoint at ./pages/api/siwe/[siwe].ts

import { nextSIWE } from "next-siwe"

export default nextSIWE({
  secret: process.env.JWT_SECRET
})

Configure the provider inside of WagmiConfig:

import { SIWEProvider } from "next-siwe"

function App({ Component, pageProps }) {
  return (
    <WagmiConfig client={client}>
      <SIWEProvider>
        <Component {...pageProps} />
      </SIWEProvider>
    </WagmiConfig>
  )
}

Use it in your pages/components:

import { useAccount, useConnect } from "wagmi"
import { useSIWE } from "next-siwe"

const Auth = () => {
  const { connector: activeConnector, isConnected } = useAccount()
  const { connect } = useConnect()
  const { isAuthenticated, login, logout } = useSIWE()

  if (!isConnected) {
    return <button onClick={connect}>Connect Wallet</button>
  }

  if (!isAuthenticated) {
    return <button onClick={login}>Sign in with Ethereum</button>
  }

  return (
    <span>
      Connected to {activeConnector.name}{" "}
      <button onClick={logout}>Disconnect</button>
    </span>
  )
}

... and you're good to go 🎉

API Reference

useSIWE()

Main React hook for SIWE.

{
  isLoading: boolean
  isAuthenticated: boolean
  address?: string
  token?: string
  login: () => Promise<void>
  logout: any
}

SIWEProvider

Provider for SIWE.

Properties:

• text = "Sign in with Ethereum to the app."
• uri = "/api/siwe"
• onToken: (token:string) => void
• staySignedInOnWalletChange: Don't log the user out when wallet changes (default false)

getToken

Returns the cookie'd token for the current user.

useToken

Hook for working with the token.

const [token, setToken] = useToken()

decode

Decode the token into JSON payload.

// in request handler

if (req.headers.authorization) {
  const token = req.headers.authorization.split(" ")[1]
  const auth = await decode(token)

  // {
  //   sessionToken: UUID,
  //   address: 0x...,
  //   expires: 1665362739
  // }
}