# Error Handling

Every module in viem exports an accompanying error type which you can use to strongly type your `catch` statements.

These types come in the form of `<Module>ErrorType`. For example, the `getBlockNumber` action exports a `GetBlockNumberErrorType` type.

Unfortunately, [TypeScript doesn't have an abstraction for typed exceptions](https://github.com/microsoft/TypeScript/issues/13219), so the most pragmatic & vanilla approach would be to explicitly cast error types in the `catch` statement.

:::code-group

```ts [example.ts] twoslash
// @noErrors
// @filename: client.ts
import { createPublicClient, http } from 'viem'
import { mainnet } from 'viem/chains'

export const client = createPublicClient({
  chain: mainnet,
  transport: http()
})
// @filename: index.ts
// ---cut---
import { type GetBlockNumberErrorType } from 'viem'
import { client } from './client'

try {
  const blockNumber = await client.getBlockNumber()
} catch (e) {
  const error = e as GetBlockNumberErrorType
  error.name 
//      ^?






  if (error.name === 'InternalRpcError')
    error.code
    //    ^?


  if (error.name === 'HttpRequestError') {
    error.headers
    //    ^?


    error.status
    //    ^?
  }
}
```

```ts [client.ts]
import { createPublicClient, http } from 'viem'
import { mainnet } from 'viem/chains'

export const publicClient = createPublicClient({
  chain: mainnet,
  transport: http()
})
```

:::