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This feature is available in the Hedera JavaScript SDK only. (version >=2.14.0).
LocalProvider is a quality of life implementation that creates a provider using the HEDERA_NETWORK environment variable. The LocalProvider() requires the following variable to be defined in the .env file. The .env file is located in the root directory of the project.
  • HEDERA_NETWORK
    • The network the wallet submits transactions to
//Example .env file
HEDERA_NETWORK= previewnet/testnet/mainnet (select one network)

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class LocalProvider implements Wallet

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Constructor

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new LocalProvider()

Instantiates the LocalProvider object. The local provider is built using HEDERA_NETWORK network specified in the .env file.

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Methods

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<LocalProvider>.getAccountBalance() -> Promise <AccountBalance>

Returns the account balance of the account in the local wallet.

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<LocalProvider>.getAccountInfo() -> Promise <AccountInfo>

Returns the account information of the account in the local wallet.

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<LocalProvider>.getAccountRecords() -> Promise <AccountInfo>

Returns the last transaction records for this account using TransactionRecordQuery.

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<LocalProvider>.getLedgerId()> LedgerId

Returns the ledger ID (previewnet, testnet, or mainnet).

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<LocalProvider>.getMirrorNetwork()> string

The mirror network the wallet is connected to.

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<LocalProvider>.getNetwork()> [key: string]: string | AccountId

Returns the network map information.

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<LocalProvider>.getTransactionReceipt()> Promise<TransactionReceipt>

Returns the transaction receipt.

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<LocalProvider>.waitForReceipt()> Promise<TransactionReceipt>

Wait for the receipt for a transaction response. <LocalProvider>.call(<RequestT, ResponseT, OutputT>(request: Executable<RequestT, ResponseT, OutputT>)> Promise <Output> Sign and send a request using the wallet.

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Local Wallet Example:

require("dotenv").config();
import { Wallet, LocalProvider } from "@hashgraph/sdk";

async function main() {

    const wallet = new Wallet(
        process.env.OPERATOR_ID,
        process.env.OPERATOR_KEY,
        new LocalProvider()
    );

    const info = await wallet.getAccountInfo();

    console.log(`info.key                          = ${info.key.toString()}`);
}

void main();

​
Sign with Local Wallet Example:

require("dotenv").config();
const {Wallet, LocalProvider, TransferTransaction} = require("@hashgraph/sdk");

async function main() {

    const wallet = new Wallet(
        process.env.OPERATOR_ID,
        process.env.OPERATOR_KEY,
        new LocalProvider()
    );

    //Transfer 1 hbar from my wallet account to account 0.0.3
    const transaction = await new TransferTransaction()
        .addHbarTransfer(wallet.getAccountId(), -1)
        .addHbarTransfer("0.0.3", 1)
        .freezeWithSigner(wallet);
    
    //Sign the transaction
    const signTransaction = await transaction.signWithSigner(wallet);

    //Submit the transaction
    const response = await signTransaction.executeWithSigner(wallet);

    //Get the receipt
    const receipt = await wallet.getProvider().waitForReceipt(response);
    
    console.log(`status: ${receipt.status.toString()}`);
}

main();