Set Up Your Local Network

While you are developing your application, you can use the Hedera-supported networks (previewnet and testnet) to test your application against. In addition to using those networks, you have the option to set up your own local consensus node and mirror node for testing purposes.

With your local network set up, you can:

• Create and submit transactions and queries to a consensus node
• Interact with the mirror node via REST APIs

1. Set Up your local network

Set-up your local network by following the instructions found in the readme of the hedera-local-node project. This will create a Hedera network composed of one consensus node and one mirror node. The consensus node will process incoming transactions and queries. The mirror node stores the history of transactions. Both nodes are created at startup.

2. Configure your network

Once you have your local network up and running, you will need to configure your Hedera client to point to your local network in your project of choice. Your project should have your language specific Hedera SDK as a dependency and imported into your project. You may reference the environment setup instructions if you don’t know how.

Your local network IP address and port will be 127.0.0.1:50211 and your local mirror node IP and port will be 127.0.0.1:5600. The consensus node account ID is 0.0.3. This is the node account ID that will receive your transaction and query requests. It is recommended to store these variables in an environment or config file. These values will be hard-coded in the example for demonstration purposes.

Configure your local network by using Client.forNetwork(). This allows you to set a custom consensus network by providing the IP address and port. Client.setMirrorNetwork() allows you to set a custom mirror node network by providing the IP address and port.

Java

//Create your local client
Client client = Client.forNetwork(Collections.singletonMap("127.0.0.1:50211", AccountId.fromString("0.0.3"))).setMirrorNetwork(List.of("127.0.0.1:5600"));

3. Set your local node transaction fee paying account

You will need an account ID and key to pay for the fees associated with each transaction and query that is submitted to your local network. You will use the account ID and key provided by the local node on startup to set up your operator account ID and key. The operator is the default account that pays for transaction and query fees.

Account ID	0.0.2
Private Key	302e020100300506032b65700422042091132178e72057a1d7528025956fe39b0b847f200ab59b2fdd367017f3087137

Note: It is not good practice to post your private keys in any public place. These keys are provided only for development and testing purposes only. They do not exist on any production networks.

Java

client.setOperator(AccountId.fromString("0.0.2"), PrivateKey.fromString("302e020100300506032b65700422042091132178e72057a1d7528025956fe39b0b847f200ab59b2fdd367017f3087137"));

4. Submit your transaction

Submit a transaction that will create a new account in your local network. The console should print out the new account ID. In this example, we are using the same key as the transaction fee paying account as the key for the new account. You can also create a new key if you wish.

Java

//Submit a transaction to your local node
TransactionResponse newAccount = new AccountCreateTransaction()
        .setKeyWithoutAlias(PrivateKey.fromString("302e020100300506032b65700422042091132178e72057a1d7528025956fe39b0b847f200ab59b2fdd367017f3087137"))
        .setInitialBalance(new Hbar(1))
        .execute(client);
                
//Get the receipt
TransactionReceipt receipt = newAccount.getReceipt(client);
        
//Get the account ID
AccountId newAccountId = receipt.accountId;
System.out.println(newAccountId);

5. View your transaction

You can view the executed transaction by querying your local mirror node.

The local mirror node endpoint URL is http://localhost:5551/.

You can view the transactions that were submitted to your local node by submitting this request:

http://localhost:5551/api/v1/transactions

The list of supported mirror node REST APIs can be found here. You have now set-up your local environment. Check out the following links for more examples.

Tutorials

SDKs

Code Check ✅

Java

import com.hedera.hashgraph.sdk.*;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.TimeoutException;

public class LocalNode {
    public static void main(String[] args) throws TimeoutException, PrecheckStatusException, ReceiptStatusException, InterruptedException, IOException {

        //Create your local client
        Client client = Client.forNetwork(Collections.singletonMap("127.0.0.1:50211", AccountId.fromString("0.0.3"))).setMirrorNetwork(List.of("127.0.0.1:5600"));

        //Set the transaction fee paying account
        client.setOperator(AccountId.fromString("0.0.2"), PrivateKey.fromString("302e020100300506032b65700422042091132178e72057a1d7528025956fe39b0b847f200ab59b2fdd367017f3087137"));
        
        //Submit a transaction to your local node
        TransactionResponse newAccount = new AccountCreateTransaction()
                .setKeyWithoutAlias(PrivateKey.fromString("302e020100300506032b65700422042091132178e72057a1d7528025956fe39b0b847f200ab59b2fdd367017f3087137"))
                .setInitialBalance(new Hbar(1))
                .execute(client);
       
        //Get the receipt     
        TransactionReceipt receipt = newAccount.getReceipt(client);
        
        //Get the account ID
        AccountId newAccountId = receipt.accountId;
        System.out.println(newAccountId);
    }
}