> ## Documentation Index
> Fetch the complete documentation index at: https://docs.getpara.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Sign Typed Data (EIP-712)

> Sign structured data using the EIP-712 standard for improved security and UX

export const Link = ({href, label, newTab = false}) => {
  const [isHovered, setIsHovered] = useState(false);
  return <a href={href} target={newTab ? '_blank' : '_self'} rel={newTab ? 'noopener noreferrer' : undefined} className="not-prose inline-block relative text-black font-semibold cursor-pointer border-b-0 no-underline" onMouseEnter={() => setIsHovered(true)} onMouseLeave={() => setIsHovered(false)}>
      {label}
      <span className={`absolute left-0 bottom-0 w-full rounded-sm bg-gradient-to-r from-orange-600 to-purple-600 transition-all duration-300 ${isHovered ? 'h-0.5' : 'h-px'}`} />
    </a>;
};

Sign structured data according to the EIP-712 standard, which provides a more readable and secure signing experience for users. This guide covers signing typed data with <Link label="Ethers.js" href="https://docs.ethers.io/v6/api/signer/#Signer-signTypedData" />, <Link label="Viem" href="https://viem.sh/docs/actions/wallet/signTypedData.html" />, and <Link label="Wagmi" href="https://wagmi.sh/react/hooks/useSignTypedData" />.

## Prerequisites

You need Web3 libraries configured with Para authentication.

<Card title="Setup Web3 Libraries" description="Configure Ethers.js, Viem, or Wagmi with Para before proceeding" href="/v3/react/guides/web3-operations/evm/setup-libraries" />

## Sign Typed Data

<Tabs>
  <Tab title="Ethers.js">
    ```tsx theme={null}
    import { useParaEthersSigner, useParaEthersSignTypedData } from "@getpara/react-sdk";
    import { JsonRpcProvider } from "ethers";

    const provider = new JsonRpcProvider("https://ethereum-sepolia-rpc.publicnode.com");

    function SignTypedData({
      domain,
      types,
      value,
    }: {
      domain: any;
      types: any;
      value: any;
    }) {
      const { ethersSigner } = useParaEthersSigner({ provider });

      const {
        signTypedDataAsync,
        isPending,
        data: signature,
      } = useParaEthersSignTypedData(ethersSigner);

      return (
        <div>
          <button
            disabled={isPending}
            onClick={() => signTypedData({ domain, types, value })}
          >
            {isPending ? "Signing..." : "Sign Typed Data"}
          </button>
          {signature && <p>Signature: {signature}</p>}
        </div>
      );
    }
    ```
  </Tab>

  <Tab title="Viem">
    ```tsx theme={null}
    import { useParaViemClient, useParaViemSignTypedData } from "@getpara/react-sdk";
    import { http } from "viem";
    import { sepolia } from "viem/chains";

    function SignTypedData({
      domain,
      types,
      primaryType,
      message,
    }: {
      domain: any;
      types: any;
      primaryType: string;
      message: any;
    }) {
      const { viemClient } = useParaViemClient({
        walletClientConfig: { chain: sepolia, transport: http() },
      });

      const {
        signTypedDataAsync,
        isPending,
        data: signature,
      } = useParaViemSignTypedData(viemClient);

      return (
        <div>
          <button
            disabled={isPending}
            onClick={() => signTypedData({ domain, types, primaryType, message })}
          >
            {isPending ? "Signing..." : "Sign Typed Data"}
          </button>
          {signature && <p>Signature: {signature}</p>}
        </div>
      );
    }
    ```
  </Tab>

  <Tab title="Wagmi">
    ```typescript theme={null}
    import { useSignTypedData } from "@getpara/react-sdk/wagmi";

    function SignTypedData(
      domain: any,
      types: any,
      primaryType: string,
      message: any
    ) {
      const { data: signature, signTypedData } = useSignTypedData();

      return (
        <div>
          <button
            onClick={() =>
              signTypedData({
                domain,
                types,
                primaryType,
                message,
              })
            }
          >
            Sign Typed Data
          </button>
          {signature && <p>Signature: {signature}</p>}
        </div>
      );
    }
    ```
  </Tab>
</Tabs>