Hedera
  • Welcome to Hedera — let’s build the future
  • Getting Started
    • Environment Setup
    • Web2 Developers
      • Transfer HBAR
      • Create a Token
      • Create a Topic
    • EVM Developers
      • Deploy a Contract
  • Tutorials
    • Smart Contracts
      • How to Mint & Burn an ERC-721 Token Using Hardhat and Ethers (Part 1)
      • How to Set Access Control, a Token URI, Pause, and Transfer an ERC-721 Token Using Hardhat (Part 2)
      • How to Verify a Smart Contract on HashScan
      • Deploy a Smart Contract Using Remix
      • Deploy a Smart Contract Using Hardhat and Hiero JSON-RPC Relay
      • Deploy Your First Smart Contract
      • Deploy a Contract Using the Hedera Token Service
      • Send and Receive HBAR Using Solidity Smart Contracts
      • Deploy By Leveraging Ethereum Developer Tools On Hedera
      • Deploy a Subgraph Using The Graph and Hedera JSON-RPC Relay
      • Deploy Smart Contracts on Hedera Using Truffle
      • The Power of Native Hedera Tokens as ERC-20 Tokens: A step-by-step guide
      • HTS x EVM - Part 1: How to Mint NFTs
      • HTS x EVM - Part 2: KYC & Update
      • HTS x EVM - Part 3: How to Pause, Freeze, Wipe, and Delete NFTs
      • Hedera Smart Contracts Workshop
        • Setup
        • Solidity
        • Hedera SDK JS
        • Hardhat and EthersJs
        • Outro
      • Foundry
        • How to Setup Foundry and Write a Basic Unit Test
        • How to Deploy and Verify a Hedera Smart Contract with Foundry
        • How to Test A Solidity Event
        • How to Fork Testnet on Latest Block
    • Consensus
      • Submit Your First Message
      • Submit Message to Private Topic
      • Query Messages with Mirror Node
    • Tokens
      • Create and Transfer Your First NFT
      • Create and Transfer Your First Fungible Token
      • Create and Transfer an NFT using a Solidity Contract
      • Structure Your Token Metadata Using JSON Schema V2
      • Hedera Token Service - Part 1: How to Mint NFTs
      • Hedera Token Service - Part 2: KYC, Update, and Scheduled Transactions
      • Hedera Token Service - Part 3: How to Pause, Freeze, Wipe, and Delete NFTs
      • Create Your First Frictionless Airdrop Campaign
    • Local Node
      • How to Run Hedera Local Node in a Cloud Development Environment (CDE)
        • Run a Local Node in Gitpod
        • Run a Local Node in Codespaces
      • How to Set Up a Hedera Local Node
      • Set Up a Hedera Local Node using the NPM CLI
    • More Tutorials
      • Create and Fund Your Hedera Testnet Account
      • How to Create a Personal Access Token (API Key) on the Hedera Portal
      • How to Auto-Create Hedera Accounts with HBAR and Token Transfers
      • How to Configure a Mirror Node and Query Data
      • How to Generate a Random Number on Hedera
      • Get Started with the Hedera Consensus Service Fabric Plugin
        • Virtual Environment Setup
      • Schedule Your First Transaction
      • How to Connect to Hedera Networks Over RPC
        • Configuring Hashio RPC endpoints
        • Configuring Hiero JSON-RPC Relay endpoints
        • Configuring Validation Cloud RPC endpoints
      • JavaScript Testing
      • Create a Hedera DApp Integrated with WalletConnect
      • How to Connect MetaMask to Hedera
    • Demo Applications
    • Starter Projects
    • Building on Hedera (course)
  • Networks
    • Mainnet
      • Mainnet Accounts
      • Mainnet Consensus Nodes
        • Node Requirements
          • FAQ
      • Fees
        • Transaction Records
    • Testnets
      • Testnet Accounts
      • Testnet Consensus Nodes
    • Localnet
      • Single Node Configuration
      • Multinode Configuration
    • Network Explorers and Tools
    • Release Notes
      • Consensus Node
      • Hedera Mirror Node
  • Core Concepts
    • Accounts
      • Account Creation
      • Auto Account Creation
      • Account Properties
    • Keys and Signatures
    • Schedule Transaction
    • Smart Contracts
      • Understanding Hedera's EVM Differences and Compatibility
        • For EVM Developers Migrating to Hedera
          • Accounts, Signature Verification & Keys (ECDSA vs. ED25519)
          • JSON-RPC Relay and EVM Tooling
          • Token Management with Hedera Token Service
          • Decimal Handling (8 vs. 18 Decimals)
          • Handling HBAR Transfers in Contracts
        • For Hedera-Native Developers Adding Smart Contract Functionality
          • Integrating ED25519 Accounts and Advanced Features Into Smart Contracts
          • JSON-RPC Relay and State Queries
          • Extending Token Management with Smart Contracts
      • Creating Smart Contracts
      • Compiling Smart Contracts
      • System Smart Contracts
        • Hedera Account Service
        • Hedera Schedule Service
      • Gas and Fees
      • JSON-RPC Relay
      • Deploying Smart Contracts
      • Smart Contract Addresses
      • Verifying Smart Contracts
      • Smart Contract Traceability
      • Tokens Managed by Smart Contracts
        • ERC-20 (Fungible Tokens)
        • ERC-721 (Non-Fungible Token)
        • ERC-3643 Real World Assets (RWA)
        • ERC-1363 (Payable Tokens)
        • Hedera Token Service System Contract
      • Wrapped HBAR (WHBAR)
      • Smart Contract Rent
      • Smart Contract Security
      • EVM Archive Node Queries
    • Tokens
      • Tokenization on Hedera
      • Hedera Token Service (HTS) Native Tokenization
        • Token Types and ID Formats
        • Token Properties
        • Token Creation
        • Custom Fee Schedule
        • Token Airdrops
      • ERC/EVM-Compatible Tokenization
      • Hybrid (HTS + EVM ) Tokenization
    • Staking
      • Staking Program
      • Stake HBAR
    • Hashgraph Consensus Algorithm
      • Gossip About Gossip
      • Virtual Voting
    • Transactions and Queries
      • Transaction Properties
    • State and History
    • Mirror Nodes
      • Hedera Mirror Node
      • One Click Mirror Node Deployment
      • Run Your Own Mirror Node
        • Run Your Own Mirror Node with Google Cloud Storage (GCS)
        • Run Your Mirror Node with Amazon Web Services S3 (AWS)
  • Open Source Solutions and Integrations
    • AI Tools for Developers
      • Hedera AI Agent Kit
      • ElizaOS Plugin for Hedera
      • Hedera Hivemind
      • Kapa AI
    • Asset Tokenization Studio (ATS)
      • Web User Interface (UI)
      • Frequently Asked Questions (FAQs)
    • HashioDAO
      • Governance Token DAO
      • NFT DAO
      • Multisig DAO
      • DAO Proposals
      • Local Environment Setup
    • Hedera CLI
    • Hedera Custodians Library
      • How to use it
    • Hedera Developer Playground
    • Hedera Wallet Snap By MetaMask
      • Hedera Wallet Snap Documentation
      • Tutorial: MetaMask Snaps – What Are They and How to Use Them
    • Interoperability and Bridging
      • LayerZero
    • NFT Studio
      • Airdrop List Verifier
      • Metadata Validator
      • NFT Rarity Inspector
      • NFT Token Holders List Builder
      • NFT Risk Calculator
      • Token Balance Snapshot
      • Hedera NFT SDK
    • Oracle Networks
      • Chainlink Oracles
      • Pyth Oracles
      • Supra Oracles
    • Stablecoin Studio
      • Core Concepts
      • Web UI Application
      • CLI Management
      • TypeScript SDK
    • Hedera Guardian
    • Hedera WalletConnect
  • SDKs & APIs
    • SDKs
      • Build Your Hedera Client
      • Set Up Your Local Network
      • Network Address Book
      • Keys
        • Generate a new key pair
        • Import an existing key
        • Create a key list
        • Create a threshold key
        • Generate a mnemonic phrase
        • Recover keys from a mnemonic phrase
      • HBAR
      • Specialized Types
      • Pseudorandom Number Generator
      • Transactions
        • Create a Batch Transaction
        • Transaction ID
        • Modify transaction fields
        • Create an unsigned transaction
        • Manually sign a transaction
        • Submit a transaction
        • Sign a multisignature transaction
        • Get a transaction receipt
        • Get a transaction record
      • Schedule Transaction
        • Schedule ID
        • Create a schedule transaction
        • Sign a scheduled transaction
        • Delete a schedule transaction
        • Get schedule info
        • Network Response Messages
      • Queries
      • General Network Response Messages
      • Accounts and HBAR
        • Create an account
        • Update an account
        • Transfer cryptocurrency
        • Approve an allowance
        • Delete an allowance
        • Delete an account
        • Get account balance
        • Get account info
        • Network Response Messages
      • Consensus Service
        • Create a topic
        • Update a topic
        • Submit a message
        • Delete a topic
        • Get topic messages
        • Get topic info
        • Network Response
      • Token Service
        • Token ID
        • NFT ID
        • Token types
        • Create a token
        • Custom token fees
        • Update a token
        • Update token custom fees
        • Update NFT metadata
        • Transfer tokens
        • Airdrop a token
        • Claim a token
        • Cancel a token
        • Reject a token
        • Delete a token
        • Mint a token
        • Burn a token
        • Freeze an account
        • Unfreeze an account
        • Enable KYC account flag
        • Disable KYC account flag
        • Associate tokens to an account
        • Dissociate tokens from an account
        • Pause a token
        • Unpause a token
        • Wipe a token
        • Atomic swaps
        • Get account token balance
        • Get token info
        • Get NFT info
        • Network Response Messages
      • File Service
        • Create a file
        • Append to a file
        • Update a file
        • Delete a file
        • Get file contents
        • Get file info
        • Network Response Messages
      • Smart Contract Service
        • Delegate Contract ID
        • Create a smart contract
        • Update a smart contract
        • Delete a smart contract
        • Call a smart contract function
        • Ethereum transaction
        • Get a smart contract function
        • Get smart contract bytecode
        • Get smart contract info
        • Hedera Service Solidity Libraries
        • Network Response Messages
      • Signature Provider
        • Provider
        • Signer
        • Wallet
        • Local Provider
    • Mirror Node REST API
      • Accounts
      • Balances
      • Blocks
      • Schedule Transactions
      • Smart Contracts
      • Tokens
      • Topics
      • Transactions
      • Network
    • Hedera Consensus Service gRPC API
    • Hedera APIs
      • Basic Types
        • AccountAmount
        • AccountID
        • ContractID
        • CryptoAllowance
        • CurrentAndNextFeeSchedule
        • FeeComponents
        • FeeData
        • FeeSchedule
        • FileID
        • Fraction
        • HederaFunctionality
        • Key
        • KeyList
        • NftAllowance
        • NftTransfer
        • NodeAddress
        • NodeAddressBook
        • RealmID
        • ScheduleID
        • SemanticVersion
        • ServicesConfigurationList
        • ServiceEndpoint
        • Setting
        • ShardID
        • Signature
        • SignatureList
        • SignatureMap
        • SignaturePair
        • SubType
        • TransferList
        • TransactionID
        • ThresholdKey
        • ThresholdSignature
        • TokenAllowance
        • TokenBalance
        • TokenBalances
        • TokenFreezeStatus
        • TokenPauseStatus
        • TokenID
        • TokenKycStatus
        • TokenRelationship
        • TokenTransferList
        • TokenType
        • TokenSupplyType
        • TopicID
        • TransactionFeeSchedule
      • Cryptocurrency Accounts
        • CryptoService
        • CryptApproveAllowance
        • CryptoDeleteAllowance
        • CryptoCreate
        • CryptoTransfer
        • CryptoUpdate
        • CryptoDelete
        • CryptoGetAccountBalance
        • CryptoGetAccountRecords
        • CryptoGetInfo
        • CryptoGetStakers
      • Consensus Service
        • Consensus Service
        • ConsensusCreateTopic
        • ConsensusUpdateTopic
        • ConsensusSubmitMessage
        • ConsensusDeleteTopic
        • ConsensusTopicInfo
        • ConsensusGetTopicInfo
      • Schedule Service
        • ScheduleService
        • SchedulableTransactionBody
        • ScheduleCreate
        • ScheduleDelete
        • ScheduleSign
        • ScheduleGetInfo
      • Token Service
        • TokenService
        • CustomFees
          • AssessedCustomFee
          • CustomFee
          • FractionalFee
          • FixedFee
          • RoyaltyFee
        • TokenCreate
        • TokenUpdate
        • TokenFeeScheduleUpdate
        • TokenDelete
        • TokenMint
        • TokenBurn
        • TokenFreezeAccount
        • TokenUnfreezeAccount
        • TokenGrantKyc
        • TokenRevokeKyc
        • TokenAssociate
        • TokenDissociate
        • TokenWipeAccount
        • TokenPause
        • TokenUnpause
        • TokenGetInfo
        • TokenGetNftInfo
        • TokenGetNftInfos
        • TokenGetAccountNftInfo
      • File Service
        • FileService
        • FileCreate
        • FileAppend
        • FileUpdate
        • FileDelete
        • FileGetContents
        • FileGetInfo
      • Smart Contracts
        • SmartContractService
        • ContractCall
        • ContractCallLocal
        • ContractCreate
        • ContractUpdate
        • ContractDelete
        • ContractGetByteCode
        • ContractGetInfo
        • ContractGetRecords
      • Miscellaneous
        • Duration
        • ExchangeRate
        • Freeze
        • FreezeType
        • GetByKey
        • GetBySolidityID
        • NetworkGetVersionInfo
        • NetworkService
        • Query
        • QueryHeader
        • Response
        • ResponseCode
        • ResponseHeader
        • SystemDelete
        • SystemUndelete
        • TimeStamp
        • Transaction
        • TransactionBody
        • TransactionContents
        • TransactionGetFastRecord
        • TransactionGetReceipt
        • TransactionGetRecord
        • TransactionReceipt
        • TransactionRecord
        • TransactionResponse
        • UncheckedSubmit
    • Hedera Status API
  • Support & Community
    • Glossary
    • Contributing to Hedera documentation
      • Contribution Guidelines
        • Creating Issues
        • Creating Pull Requests
        • Hedera Improvement Proposal (HIP)
        • Submit Demo Applications
      • Style Guide
        • Understanding different types of documentation
        • Use of HBAR and tinybars
        • Use of web2 and web3
        • Language and grammar
        • Formatting
        • Punctuation
        • GitBook Markdown Syntax
    • Discord
    • GitHub
    • Stack Overflow
    • Hedera Blog
    • Bug Bounty
    • Hedera Help
    • Documentation Survey
    • Meetups
    • Brand Guidelines
    • Status Page
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INTRODUCTION

  • Fees
  • Core Concepts
  • Network Information

TOOLS

  • Bridge
  • Oracles
  • Explorers
  • Developer Portal & Faucet

RESOURCES

  • Status
  • Bug Bounty
  • Build on Hedera (course)
  • Documentation Survey
On this page
  • 1. Configure your Hedera Network
  • 2. Define the operator account ID and private key
  • From an account ID and private key
  • From a .env file
  • 3. Additional client modifications

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  1. SDKs & APIs
  2. SDKs

Build Your Hedera Client

PreviousSDKsNextSet Up Your Local Network

Last updated 1 year ago

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1. Configure your Hedera Network

Build your client to interact with any of the Hedera network nodes. Mainnet, testnet, and previewnet are the three Hedera networks you can submit transactions and queries to.

For a predefined network (preview, testnet, and mainnet), the mirror node client is configured to the corresponding network mirror node. The default mainnet mirror node connection is to the . To access the public mainnet mirror node, use setMirrorNetwork() and enter mainnet-public.mirrornode.hedera.com:433 for the endpoint. The gRPC API requires TLS. The following SDK versions are compatible with TLS:

  • Java: v2.3.0+

  • JavaScript: v2.4.0+

  • Go: v2.4.0+

Method

Type

Description

Client.forPreviewnet()

Constructs a Hedera client pre-configured for Previewnet access

Client.forTestnet()

Constructs a Hedera client pre-configured for Testnet access

Client.forMainnet()

Constructs a Hedera client pre-configured for Mainnet access

Client.forNetwork(<network>)

Map<String, AccountId>

Construct a client given a set of nodes. It is the responsibility of the caller to ensure that all nodes in the map are part of the same Hedera network. Failure to do so will result in undefined behavior.

Client.fromConfig(<json>)

String

Client.fromConfig(<json>)

Reader

Configure a client from the given JSON reader

Client.fromConfigFile(<file>)

File

Configure a client based on a JSON file.

Client.fromConfigFile(<fileName>)

String

Configure a client based on a JSON file at the given path.

Client.forName(<name>)

String

Provide the name of the network. mainnet testnet previewnet

Client.<network>.setMirrorNetwork(<network>)

List<String>

Define a specific mirror network node(s) ip:port in string format

Client.<network>.getMirrorNetwork()

List<String>

Return the mirror network node(s) ip:port in string format

Client.setTransportSecurity()

boolean

Set if transport security should be used. If transport security is enabled all connections to nodes will use TLS, and the server's certificate hash will be compared to the hash stored in the node address book for the given network.

Client.setNetworkUpdatePeriod()

Duration

Client automatically updates the network via a mirror node query at regular intervals. You can set the interval at which the address book is updated.

Client.setNetworkFromAddressBook(<addressBook>)

AddressBook

Client can be set from a NodeAddressBook.

Client.setLedgerId(<ledgerId>)

LedgerId

The ID of the network. LedgerId.MAINNET LedgerId.TESTNET LedgerId.PREVIEWNET

Client.getLedgerId()

LedgerId

Get the ledger ID

Client.setVerifyCertificates()

boolean

Set if server certificates should be verified against an existing address book.

// From a pre-configured network
Client client = Client.forTestnet();

//For a specified network
Map<String, AccountId> nodes = new HashMap<>();
nodes.put("34.94.106.61:50211" ,AccountId.fromString("0.0.10"));

Client.forNetwork(nodes);

//v2.0.0
// From a pre-configured network
const client = Client.forTestnet();

//For a specified network
const nodes = {"34.94.106.61:50211": new AccountId(10)}
const client = Client.forNetwork(nodes);

//v2.0.7
// From a pre-configured network
client := hedera.ClientForTestnet()

//For a specified network
node := map[string]AccountID{
    "34.94.106.61:50211": {Account: 10}
}

client := Client.forNetwork(nodes)

//v2.0.0

2. Define the operator account ID and private key

The operator is the account that will, by default, pay the transaction fee for transactions and queries built with this client. The operator account ID is used to generate the default transaction ID for all transactions executed with this client. The operator private key is used to sign all transactions executed by this client.

Method
Type

Client.<network>.setOperator(<accountId, privateKey>)

AccountId, PrivateKey

Client.<network>.setOperatorWith(<accountId, privateKey, transactionSigner>)

AccountId, PrivateKey, Function<byte[ ], byte [ ]>

From an account ID and private key

// Operator account ID and private key from string value
AccountId MY_ACCOUNT_ID = AccountId.fromString("0.0.96928");
Ed25519PrivateKey MY_PRIVATE_KEY = PrivateKey.fromString("302e020100300506032b657004220420b9c3ebac81a72aafa5490cc78111643d016d311e60869436fbb91c7330796928");

// Pre-configured client for test network (testnet)
Client client = Client.forTestnet()

//Set the operator with the account ID and private key
client.setOperator(MY_ACCOUNT_ID, MY_PRIVATE_KEY);
// Your account ID and private key from string value
const MY_ACCOUNT_ID = AccountId.fromString("0.0.96928");
const MY_PRIVATE_KEY = PrivateKey.fromString("302e020100300506032b657004220420b9c3ebac81a72aafa5490cc78111643d016d311e60869436fbb91c7330796928");

// Pre-configured client for test network (testnet)
const client = Client.forTestnet()

//Set the operator with the account ID and private key
client.setOperator(MY_ACCOUNT_ID, MY_PRIVATE_KEY);
// Operator account ID and private key from string value
operatorAccountID, err := hedera.AccountIDFromString("0.0.96928")
if err != nil {
    panic(err)
}

operatorKey, err := hedera.PrivateKeyFromString("302e020100300506032b65700422042012a4a4add3d885bd61d7ce5cff88c5ef2d510651add00a7f64cb90de33596928")
if err != nil {
    panic(err)
}

// Pre-configured client for test network (testnet)
client := hedera.ClientForTestnet()

//Set the operator with the operator ID and operator key
client.SetOperator(operatorAccountID, operatorKey)

From a .env file

The .env file is created in the root directory of the SDK. The .env file stores account ID and the associated private key information to reference throughout your code. You will need to import the relevant dotenv module to your project files. The sample .env file may look something like this:

.env

MY_ACCOUNT_ID=0.0.941
MY_PRIVATE_KEY=302e020100300506032b65700422042012a4a4add3d885bd61d7ce5cff88c5ef2d510651add00a7f64cb90de3359bc5e
//Grab the account ID and private key of the operator account from the .env file
AccountId MY_ACCOUNT_ID = AccountId.fromString(Objects.requireNonNull(Dotenv.load().get("OPERATOR_ID")));
Ed25519PrivateKey MY_PRIVATE_KEY = Ed25519PrivateKey.fromString(Objects.requireNonNull(Dotenv.load().get("OPERATOR_KEY")));

// Pre-configured client for test network (testnet)
Client client = Client.forTestnet()

//Set the operator with the account ID and private key
client.setOperator(MY_ACCOUNT_ID, MY_PRIVATE_KEY);
//Grab the account ID and private key of the operator account from the .env file
const myAccountId = process.env.MY_ACCOUNT_ID;
const myPrivateKey = process.env.MY_PRIVATE_KEY;

// Pre-configured client for test network (testnet)
const client = Client.forTestnet()

//Set the operator with the account ID and private key
client.setOperator(myAccountId, myPrivateKey);
    err := godotenv.Load(".env")
    if err != nil {
        panic(fmt.Errorf("Unable to load environment variables from demo.env file. Error:\n%v\n", err))
    }

    //Get the operator account ID and private key
    MY_ACCOUNT_ID := os.Getenv("MY_ACCOUNT_ID")
    MY_PRIVATE_KEY := os.Getenv("MY_PRIVATE_KEY")


    myAccountID, err := hedera.AccountIDFromString(MY_ACCOUNT_ID)
    if err != nil {
        panic(err)
    }

    myPrivateKey, err := hedera.PrivateKeyFromString(MY_PRIVATE_KEY)
    if err != nil {
        panic(err)
    }

3. Additional client modifications

The max transaction fee and max query payment are both set to 100_000_000 tinybar (1 HBAR). This amount can be modified by using setDefaultMaxTransactionFee()and setDefaultMaxQueryPayment().

Method
Type
Description

Client.<network>.SetDefaultRegenerateTransactionId(<regenerateTransactionId>)

boolean

Whether or not to regenerate the transaction IDs

Client.<network>.getDefaultRegenerateTransactionId(<regenerateTransactionId>)

boolean

Get the default regenerate transaction ID boolean value

Client.<network>.setDefaultMaxTransactionFee(<fee>)

Hbar

The maximum transaction fee the client is willing to pay

Client.<network>.getDefaultMaxTransactionFee()

Hbar

Get the default max transaction fee that is set

Client<network>.setDefaultMaxQueryPayment(<maxQueryPayment>)

Hbar

The maximum query payment the client will pay.

Default: 1 hbar

Client<network>.getDefaultMaxQueryPayment()

Hbar

Get the default max query payment

Client.<network>.setNetwork(<nodes>)

Map<String, AccountId>

Replace all nodes in this Client with a new set of nodes (e.g. for an Address Book update)

Client.<network>.getNetwork()

Map<String, AccountId>

Get the network nodes

Client.<network>.setRequestTimeout(<requestTimeout>)

Duration

The period of time a transaction or query request will retry from a "busy" network response

Client.<network>.getRequestTimeout()

Duration

Get the period of time a transaction or query request will retry from a "busy" network response

Client.<network>.setMinBackoff(<minBackoff>)

Duration

The minimum amount of time to wait between retries. When retrying, the delay will start at this time and increase exponentially until it reaches the maxBackoff

Client.<network>.getMinBackoff()

Duration

Get the minimum amount of time to wait between retries

Client.<network>.setMaxBackoff(<maxBackoff>)

Duration

The maximum amount of time to wait between retries. Every retry attempt will increase the wait time exponentially until it reaches this time.

Client.<network>.getMaxBackoff()

Duration

Get the maximum amount of time to wait between retries

Client.<network>.setAutoValidateChecksums(<value>)

boolean

Validate checksums

Client.<network>.setCloseTimeout(<closeTimeout>)

Duration

Timeout for closing either a single node when setting a new network, or closing the entire network

Client.<network>.setMaxNodeAttempts(<nodeAttempts>)

int

Set the max number of times a node can return a bad gRPC status before we remove it from the list

Client.<network>.getMaxNodeAttempts()

int

Get the max node attempts set

Client.<network>.setMinNodeReadmitTime(<readmitTime>)

Duration

The min time to wait before attempting to readmit nodes

Client.<network>.getMinNodeReadmitTime()

Duration

Get the minimum node readmit time

Client.<network>.setMaxNodeReadmitTime(<readmitTime>)

Duration

The max time to wait before attempting to readmit nodes

Client.<network>.getMaxNodeReadmitTime()

Duration

Get the max node readmit time

// For test network (testnet)
Client client = Client.forTestnet()

//Set your account as the client's operator
client.setOperator(myAccountId, myPrivateKey);

//Set the default maximum transaction fee (in Hbar)
client.setDefaultMaxTransactionFee(new Hbar(10));

//Set the maximum payment for queries (in Hbar)
client.setDefaultMaxQueryPayment(new Hbar(5));

//v2.0.0
JavaScript
// For test network (testnet)
const client = Client.forTestnet()

//Set your account as the client's operator
client.setOperator(myAccountId, myPrivateKey);

//Set the default maximum transaction fee (in Hbar)
client.setDefaultMaxTransactionFee(new Hbar(10));

//Set the maximum payment for queries (in Hbar)
client.setDefaultMaxQueryPayment(new Hbar(5));

//v2.0.0
// For test network (testnet)
client := hedera.ClientForTestnet()

//Set your account as the client's operator
client.SetOperator(myAccountId, myPrivateKey)

// Set default max transaction fee
client.SetDefaultMaxTransactionFee(hedera.HbarFrom(10, hedera.HbarUnits.Hbar))

// Set max query payment
client.setDefaultMaxQueryPayment(hedera.HbarFrom(5, hedera.HbarUnits.Hbar))

//v2.0.0

Configure a client from the given JSON string describing a

ClientConfiguration object
whitelisted mirror node