> For the complete documentation index, see [llms.txt](https://docs.thewalletcrew.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.thewalletcrew.io/connectors/custom-connector/custom-connector-scripting-reference/account-validation.md).

# Account validation

Validate an account before it is created or checked, using \`runtime.scriptable.scriptableAccountValidator\`.

The Wallet Crew calls `runtime.scriptable.scriptableAccountValidator` when validating an account, before it is created or checked. It needs no additional configuration — registering the endpoint in a script is enough for it to be called.

```js
/**
 * @typedef {Object} ErrorDetail
 * @property {string} Detail - Human-readable description of the validation failure.
 * @property {string} [Field] - Optional field name the error relates to.
 */

/**
 * @param {Record<string, any>} account - The account entity being validated.
 * @returns {Promise<ErrorDetail[]>} An empty array (or nothing) means the account is valid.
 */
async function validate(account) {
  const errors = [];

  if (!account["email"]) {
    errors.push({ Detail: "Email is required", Field: "email" });
  }

  return errors;
}

export default function (context) {
  context.register('runtime.scriptable.scriptableAccountValidator', {
    Validate: validate
  });
}
```

Returning an empty array (or an array with no entries) means the account passes validation. Each entry in a non-empty array is treated as a distinct validation failure, with an optional `Field` to associate it with a specific input.


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