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# `eth_signTypedData_v4`

Signs an [EIP-712](https://eips.ethereum.org/EIPS/eip-712) typed data structure with the connected account's key. The typed data is supplied as a JSON-stringified payload following the v4 format.

To sign an arbitrary message instead of structured data, use [`personal_sign`](/docs/rpc/personal_sign).

## Request

```ts
type Request = {
  method: 'eth_signTypedData_v4'
  params: [
    `0x${string}`, // signer address
    string,        // JSON-stringified EIP-712 typed data payload
  ]
}
```

The typed data payload is a JSON string with the following shape:

```ts
type TypedData = {
  domain: {
    name?: string
    version?: string
    chainId?: number
    verifyingContract?: `0x${string}`
    salt?: `0x${string}`
  }
  types: Record<string, { name: string; type: string }[]>
  primaryType: string
  message: Record<string, unknown>
}
```

## Response

```ts
type Response = `0x${string}` // signature
```

## Example

```ts
const signature = await provider.request({
  method: 'eth_signTypedData_v4',
  params: [
    '0x...',
    JSON.stringify({
      domain: {
        name: 'Example',
        version: '1',
        chainId: 1,
        verifyingContract: '0x...',
      },
      types: {
        EIP712Domain: [
          { name: 'name', type: 'string' },
          { name: 'version', type: 'string' },
          { name: 'chainId', type: 'uint256' },
          { name: 'verifyingContract', type: 'address' },
        ],
        Mail: [
          { name: 'from', type: 'address' },
          { name: 'to', type: 'address' },
          { name: 'contents', type: 'string' },
        ],
      },
      primaryType: 'Mail',
      message: {
        from: '0x...',
        to: '0x...',
        contents: 'Hello, Tempo!',
      },
    }),
  ],
})
```