> ## Documentation Index
> Fetch the complete documentation index at: https://docs.hedera.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Signer
This feature is available in the [Hedera JavaScript SDK](https://github.com/hashgraph/hedera-sdk-js) only. (version >=2.14.0).
The **Signer** class an interface and is responsible for signing requests.
## Interface Signer
### **Methods**
**`getLedgerId()`->** **`LedgerId`**
Returns the ledger ID.
**`getAccountId()`->`AccountId`**
Returns the account ID associated with this signer.
**`getAccountKey()`->`Key`**
Returns the account key.
**`getNetwork()`->\[`Key:string]: string`**
Returns the account key.
**`sign (messages; Uint8Array[])`->** **`Promise`**
Sign an arbitrary list of messages.
**`getAccountBalance()`->** **`Promise`**
Returns the account balance.
**`getAccountInfo`()->** **`Promise`**
Returns the account info.
**`getAccountRecords`()->** **`Promise`**
Fetch the account record for the signer's account ID.
**signTransaction extends Transaction>`(transaction:T` )->** **`Promise`**
Signs a transaction, returning the signed transaction
**NOTE**: This method is allowed to mutate the parameter being passed in so the returned transaction is not guaranteed to be a new instance of the transaction.
**`checkTransaction`** **( `transaction`: `T` )-> `Promise`**
Check whether all the required fields are set appropriately. Fields such as the transaction ID's account ID should either be `null` or be equal to the signer's account ID, and the node account IDs on the request should exist within the signer's network.
**`populateTransaction`**\*\* ( `transaction`: `T` )-> `Promise`\*\*
Populate the requests with the required fields. The transaction ID should be constructed from the signer's account ID, and the node account IDs should be set using the signer's network.
**`call((request: Executable)`->** **`Promise