[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Type](https://evolu.dev/docs/api-reference/common/Type) › Mnemonic

```ts
const Mnemonic:  brand(
  "Mnemonic",
  NonEmptyTrimmedString,
  (value) =>
    bip39.validateMnemonic(value, wordlist)
      ? ok()
      : err<MnemonicError>({ type: "Mnemonic", value }),
  (error) =>
    The value ${safelyStringifyUnknownValue(error.value)} is not a valid English BIP39 mnemonic.,
) ;
```

Defined in: [packages/common/src/Type.ts:5855](https://github.com/evoluhq/evolu/blob/037c390af081e9944d616ff298a729515c5c5ab7/packages/common/src/Type.ts#L5855)

A valid English BIP39 mnemonic.